FA-89426 / Instruction set emulation / Open access
Indexed indirect pointer high byte read from page one · case 01
(zp,X) with a pointer at 0xFF reads its high byte from 0x100.
ROOT CAUSE
The pointer high-byte address is not wrapped within zero page.
VERIFIED REPAIR
Read the high byte from (p + 1) & 0xFF.
Unsuccessful approach: Wrapping correctly but assembling the pointer big-endian swaps the address bytes.
Case contract
Input [mode, operand, x, y, mem] with mem mapping decimal-string addresses to bytes (missing = 0). zp: operand & 0xFF. zpx: (operand + x) & 0xFF. abs: operand. absx: (operand + x) & 0xFFFF. absy: (operand + y) & 0xFFFF. ind: little-endian pointer at operand, where the high byte is fetched from the same page ((operand & 0xFF00) | ((operand + 1) & 0xFF)). indx: pointer at zero-page (operand + x) & 0xFF, high byte from the next zero-page byte (wrapping). indy: pointer at zero-page operand (high byte wrapping in zero page), plus y, wrapped to 16 bits.
Why this case matters
Addressing-mode decoding is the core of any 8-bit CPU emulator; page-wrap quirks are observable program behaviour.
1 / The failure
Exit 1"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(*args):
mode, operand, x, y, mem = args
def rd(a):
return mem.get(str(a & 0xFFFF), 0)
if mode == 'zp': return operand & 0xFF
if mode == 'zpx': return (operand + x) & 0xFF
if mode == 'abs': return operand
if mode == 'absx': return (operand + x) & 0xFFFF
if mode == 'absy': return (operand + y) & 0xFFFF
if mode == 'ind':
lo = rd(operand)
hi = rd((operand & 0xFF00) | ((operand + 1) & 0xFF))
return hi << 8 | lo
if mode == 'indx':
p = (operand + x) & 0xFF
return rd(p + 1) << 8 | rd(p)
if mode == 'indy':
p = operand & 0xFF
base = rd((p + 1) & 0xFF) << 8 | rd(p)
return (base + y) & 0xFFFF
return None
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('zero page indexed wraps', ['zpx', 241, 32, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 17), ('absolute indexed crosses page', ['absx', 4336, 33, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 4369), ('absolute indexed wraps top', ['absx', 65520, 49, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 33), ('indirect jump page bug', ['ind', 4351, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 25889), ('indirect jump normal', ['ind', 8448, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 119), ('indexed indirect pointer wraps', ['indx', 254, 1, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13432), ('indexed indirect plain', ['indx', 14, 2, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indirect indexed adds after load', ['indy', 16, 0, 17, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43998), ('indirect indexed pointer wraps and crosses', ['indy', 255, 0, 240, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13672), ('indirect indexed result wraps', ['indy', 128, 0, 33, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 17), ('zero page plain', ['zp', 511, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 255), ('absolute Y with X set', ['absy', 8193, 17, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 8193), ('absolute Y indexed', ['absy', 12528, 5, 33, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 12561)], [('zero page indexed wraps', ['zpx', 242, 32, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 18), ('absolute indexed crosses page', ['absx', 4336, 34, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 4370), ('absolute indexed wraps top', ['absx', 65520, 50, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 34), ('indirect jump page bug', ['ind', 4351, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 25889), ('indirect jump normal', ['ind', 16, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indexed indirect pointer wraps', ['indx', 254, 1, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13432), ('indexed indirect plain', ['indx', 14, 2, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indirect indexed adds after load', ['indy', 16, 0, 18, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43999), ('indirect indexed pointer wraps and crosses', ['indy', 255, 0, 240, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13672), ('indirect indexed result wraps', ['indy', 128, 0, 34, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 18), ('zero page plain', ['zp', 511, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 255), ('absolute Y with X set', ['absy', 8194, 17, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 8194), ('absolute Y indexed', ['absy', 12528, 5, 34, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 12562)], [('zero page indexed wraps', ['zpx', 243, 32, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 19), ('absolute indexed crosses page', ['absx', 4336, 35, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 4371), ('absolute indexed wraps top', ['absx', 65520, 51, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 35), ('indirect jump page bug', ['ind', 4351, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 25889), ('indirect jump normal', ['ind', 8448, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 119), ('indexed indirect pointer wraps', ['indx', 254, 1, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13432), ('indexed indirect plain', ['indx', 14, 2, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indirect indexed adds after load', ['indy', 16, 0, 19, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 44000), ('indirect indexed pointer wraps and crosses', ['indy', 255, 0, 240, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13672), ('indirect indexed result wraps', ['indy', 128, 0, 35, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 19), ('zero page plain', ['zp', 511, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 255), ('absolute Y with X set', ['absy', 8195, 17, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 8195), ('absolute Y indexed', ['absy', 12528, 5, 35, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 12563)], [('zero page indexed wraps', ['zpx', 244, 32, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 20), ('absolute indexed crosses page', ['absx', 4336, 36, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 4372), ('absolute indexed wraps top', ['absx', 65520, 52, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 36), ('indirect jump page bug', ['ind', 4351, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 25889), ('indirect jump normal', ['ind', 16, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indexed indirect pointer wraps', ['indx', 254, 1, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13432), ('indexed indirect plain', ['indx', 14, 2, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indirect indexed adds after load', ['indy', 16, 0, 20, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 44001), ('indirect indexed pointer wraps and crosses', ['indy', 255, 0, 240, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13672), ('indirect indexed result wraps', ['indy', 128, 0, 36, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 20), ('zero page plain', ['zp', 511, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 255), ('absolute Y with X set', ['absy', 8196, 17, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 8196), ('absolute Y indexed', ['absy', 12528, 5, 36, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 12564)], [('zero page indexed wraps', ['zpx', 245, 32, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 21), ('absolute indexed crosses page', ['absx', 4336, 37, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 4373), ('absolute indexed wraps top', ['absx', 65520, 53, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 37), ('indirect jump page bug', ['ind', 4351, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 25889), ('indirect jump normal', ['ind', 8448, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 119), ('indexed indirect pointer wraps', ['indx', 254, 1, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13432), ('indexed indirect plain', ['indx', 14, 2, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indirect indexed adds after load', ['indy', 16, 0, 21, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 44002), ('indirect indexed pointer wraps and crosses', ['indy', 255, 0, 240, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13672), ('indirect indexed result wraps', ['indy', 128, 0, 37, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 21), ('zero page plain', ['zp', 511, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 255), ('absolute Y with X set', ['absy', 8197, 17, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 8197), ('absolute Y indexed', ['absy', 12528, 5, 37, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 12565)]]
for label, args, expected in fixtures[N-1]:
check(label, solve(*args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| zero page indexed wraps | 17 | 17 | Passed |
| absolute indexed crosses page | 4369 | 4369 | Passed |
| absolute indexed wraps top | 33 | 33 | Passed |
| indirect jump page bug | 25889 | 25889 | Passed |
| indirect jump normal | 119 | 119 | Passed |
| indexed indirect pointer wraps | 120 | 13432 | Failed |
| indexed indirect plain | 43981 | 43981 | Passed |
| indirect indexed adds after load | 43998 | 43998 | Passed |
| indirect indexed pointer wraps and crosses | 13672 | 13672 | Passed |
| indirect indexed result wraps | 17 | 17 | Passed |
| zero page plain | 255 | 255 | Passed |
| absolute Y with X set | 8193 | 8193 | Passed |
| absolute Y indexed | 12561 | 12561 | Passed |
SHA-256 / c51dc8ed08c7321b46841aa5e0b4dd1cc4f2bb284188865a491321e2d5cba5ae
2 / The unsuccessful fix
Exit 1"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(*args):
mode, operand, x, y, mem = args
def rd(a):
return mem.get(str(a & 0xFFFF), 0)
if mode == 'zp': return operand & 0xFF
if mode == 'zpx': return (operand + x) & 0xFF
if mode == 'abs': return operand
if mode == 'absx': return (operand + x) & 0xFFFF
if mode == 'absy': return (operand + y) & 0xFFFF
if mode == 'ind':
lo = rd(operand)
hi = rd((operand & 0xFF00) | ((operand + 1) & 0xFF))
return hi << 8 | lo
if mode == 'indx':
p = (operand + x) & 0xFF
return rd(p) << 8 | rd((p + 1) & 0xFF)
if mode == 'indy':
p = operand & 0xFF
base = rd((p + 1) & 0xFF) << 8 | rd(p)
return (base + y) & 0xFFFF
return None
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('zero page indexed wraps', ['zpx', 241, 32, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 17), ('absolute indexed crosses page', ['absx', 4336, 33, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 4369), ('absolute indexed wraps top', ['absx', 65520, 49, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 33), ('indirect jump page bug', ['ind', 4351, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 25889), ('indirect jump normal', ['ind', 8448, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 119), ('indexed indirect pointer wraps', ['indx', 254, 1, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13432), ('indexed indirect plain', ['indx', 14, 2, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indirect indexed adds after load', ['indy', 16, 0, 17, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43998), ('indirect indexed pointer wraps and crosses', ['indy', 255, 0, 240, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13672), ('indirect indexed result wraps', ['indy', 128, 0, 33, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 17), ('zero page plain', ['zp', 511, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 255), ('absolute Y with X set', ['absy', 8193, 17, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 8193), ('absolute Y indexed', ['absy', 12528, 5, 33, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 12561)], [('zero page indexed wraps', ['zpx', 242, 32, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 18), ('absolute indexed crosses page', ['absx', 4336, 34, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 4370), ('absolute indexed wraps top', ['absx', 65520, 50, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 34), ('indirect jump page bug', ['ind', 4351, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 25889), ('indirect jump normal', ['ind', 16, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indexed indirect pointer wraps', ['indx', 254, 1, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13432), ('indexed indirect plain', ['indx', 14, 2, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indirect indexed adds after load', ['indy', 16, 0, 18, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43999), ('indirect indexed pointer wraps and crosses', ['indy', 255, 0, 240, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13672), ('indirect indexed result wraps', ['indy', 128, 0, 34, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 18), ('zero page plain', ['zp', 511, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 255), ('absolute Y with X set', ['absy', 8194, 17, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 8194), ('absolute Y indexed', ['absy', 12528, 5, 34, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 12562)], [('zero page indexed wraps', ['zpx', 243, 32, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 19), ('absolute indexed crosses page', ['absx', 4336, 35, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 4371), ('absolute indexed wraps top', ['absx', 65520, 51, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 35), ('indirect jump page bug', ['ind', 4351, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 25889), ('indirect jump normal', ['ind', 8448, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 119), ('indexed indirect pointer wraps', ['indx', 254, 1, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13432), ('indexed indirect plain', ['indx', 14, 2, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indirect indexed adds after load', ['indy', 16, 0, 19, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 44000), ('indirect indexed pointer wraps and crosses', ['indy', 255, 0, 240, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13672), ('indirect indexed result wraps', ['indy', 128, 0, 35, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 19), ('zero page plain', ['zp', 511, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 255), ('absolute Y with X set', ['absy', 8195, 17, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 8195), ('absolute Y indexed', ['absy', 12528, 5, 35, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 12563)], [('zero page indexed wraps', ['zpx', 244, 32, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 20), ('absolute indexed crosses page', ['absx', 4336, 36, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 4372), ('absolute indexed wraps top', ['absx', 65520, 52, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 36), ('indirect jump page bug', ['ind', 4351, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 25889), ('indirect jump normal', ['ind', 16, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indexed indirect pointer wraps', ['indx', 254, 1, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13432), ('indexed indirect plain', ['indx', 14, 2, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indirect indexed adds after load', ['indy', 16, 0, 20, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 44001), ('indirect indexed pointer wraps and crosses', ['indy', 255, 0, 240, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13672), ('indirect indexed result wraps', ['indy', 128, 0, 36, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 20), ('zero page plain', ['zp', 511, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 255), ('absolute Y with X set', ['absy', 8196, 17, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 8196), ('absolute Y indexed', ['absy', 12528, 5, 36, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 12564)], [('zero page indexed wraps', ['zpx', 245, 32, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 21), ('absolute indexed crosses page', ['absx', 4336, 37, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 4373), ('absolute indexed wraps top', ['absx', 65520, 53, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 37), ('indirect jump page bug', ['ind', 4351, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 25889), ('indirect jump normal', ['ind', 8448, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 119), ('indexed indirect pointer wraps', ['indx', 254, 1, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13432), ('indexed indirect plain', ['indx', 14, 2, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indirect indexed adds after load', ['indy', 16, 0, 21, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 44002), ('indirect indexed pointer wraps and crosses', ['indy', 255, 0, 240, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13672), ('indirect indexed result wraps', ['indy', 128, 0, 37, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 21), ('zero page plain', ['zp', 511, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 255), ('absolute Y with X set', ['absy', 8197, 17, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 8197), ('absolute Y indexed', ['absy', 12528, 5, 37, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 12565)]]
for label, args, expected in fixtures[N-1]:
check(label, solve(*args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| zero page indexed wraps | 17 | 17 | Passed |
| absolute indexed crosses page | 4369 | 4369 | Passed |
| absolute indexed wraps top | 33 | 33 | Passed |
| indirect jump page bug | 25889 | 25889 | Passed |
| indirect jump normal | 119 | 119 | Passed |
| indexed indirect pointer wraps | 30772 | 13432 | Failed |
| indexed indirect plain | 52651 | 43981 | Failed |
| indirect indexed adds after load | 43998 | 43998 | Passed |
| indirect indexed pointer wraps and crosses | 13672 | 13672 | Passed |
| indirect indexed result wraps | 17 | 17 | Passed |
| zero page plain | 255 | 255 | Passed |
| absolute Y with X set | 8193 | 8193 | Passed |
| absolute Y indexed | 12561 | 12561 | Passed |
SHA-256 / ab56697c7df520382494ebbd8c295636c49e6d8740ef3dfd8368f3defb237f5a
3 / The verified repair
Exit 0"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(*args):
mode, operand, x, y, mem = args
def rd(a):
return mem.get(str(a & 0xFFFF), 0)
if mode == 'zp': return operand & 0xFF
if mode == 'zpx': return (operand + x) & 0xFF
if mode == 'abs': return operand
if mode == 'absx': return (operand + x) & 0xFFFF
if mode == 'absy': return (operand + y) & 0xFFFF
if mode == 'ind':
lo = rd(operand)
hi = rd((operand & 0xFF00) | ((operand + 1) & 0xFF))
return hi << 8 | lo
if mode == 'indx':
p = (operand + x) & 0xFF
return rd((p + 1) & 0xFF) << 8 | rd(p)
if mode == 'indy':
p = operand & 0xFF
base = rd((p + 1) & 0xFF) << 8 | rd(p)
return (base + y) & 0xFFFF
return None
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('zero page indexed wraps', ['zpx', 241, 32, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 17), ('absolute indexed crosses page', ['absx', 4336, 33, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 4369), ('absolute indexed wraps top', ['absx', 65520, 49, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 33), ('indirect jump page bug', ['ind', 4351, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 25889), ('indirect jump normal', ['ind', 8448, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 119), ('indexed indirect pointer wraps', ['indx', 254, 1, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13432), ('indexed indirect plain', ['indx', 14, 2, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indirect indexed adds after load', ['indy', 16, 0, 17, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43998), ('indirect indexed pointer wraps and crosses', ['indy', 255, 0, 240, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13672), ('indirect indexed result wraps', ['indy', 128, 0, 33, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 17), ('zero page plain', ['zp', 511, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 255), ('absolute Y with X set', ['absy', 8193, 17, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 8193), ('absolute Y indexed', ['absy', 12528, 5, 33, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 12561)], [('zero page indexed wraps', ['zpx', 242, 32, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 18), ('absolute indexed crosses page', ['absx', 4336, 34, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 4370), ('absolute indexed wraps top', ['absx', 65520, 50, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 34), ('indirect jump page bug', ['ind', 4351, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 25889), ('indirect jump normal', ['ind', 16, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indexed indirect pointer wraps', ['indx', 254, 1, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13432), ('indexed indirect plain', ['indx', 14, 2, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indirect indexed adds after load', ['indy', 16, 0, 18, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43999), ('indirect indexed pointer wraps and crosses', ['indy', 255, 0, 240, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13672), ('indirect indexed result wraps', ['indy', 128, 0, 34, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 18), ('zero page plain', ['zp', 511, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 255), ('absolute Y with X set', ['absy', 8194, 17, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 8194), ('absolute Y indexed', ['absy', 12528, 5, 34, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 12562)], [('zero page indexed wraps', ['zpx', 243, 32, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 19), ('absolute indexed crosses page', ['absx', 4336, 35, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 4371), ('absolute indexed wraps top', ['absx', 65520, 51, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 35), ('indirect jump page bug', ['ind', 4351, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 25889), ('indirect jump normal', ['ind', 8448, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 119), ('indexed indirect pointer wraps', ['indx', 254, 1, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13432), ('indexed indirect plain', ['indx', 14, 2, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indirect indexed adds after load', ['indy', 16, 0, 19, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 44000), ('indirect indexed pointer wraps and crosses', ['indy', 255, 0, 240, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13672), ('indirect indexed result wraps', ['indy', 128, 0, 35, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 19), ('zero page plain', ['zp', 511, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 255), ('absolute Y with X set', ['absy', 8195, 17, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 8195), ('absolute Y indexed', ['absy', 12528, 5, 35, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 12563)], [('zero page indexed wraps', ['zpx', 244, 32, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 20), ('absolute indexed crosses page', ['absx', 4336, 36, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 4372), ('absolute indexed wraps top', ['absx', 65520, 52, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 36), ('indirect jump page bug', ['ind', 4351, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 25889), ('indirect jump normal', ['ind', 16, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indexed indirect pointer wraps', ['indx', 254, 1, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13432), ('indexed indirect plain', ['indx', 14, 2, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indirect indexed adds after load', ['indy', 16, 0, 20, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 44001), ('indirect indexed pointer wraps and crosses', ['indy', 255, 0, 240, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13672), ('indirect indexed result wraps', ['indy', 128, 0, 36, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 20), ('zero page plain', ['zp', 511, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 255), ('absolute Y with X set', ['absy', 8196, 17, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 8196), ('absolute Y indexed', ['absy', 12528, 5, 36, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 12564)], [('zero page indexed wraps', ['zpx', 245, 32, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 21), ('absolute indexed crosses page', ['absx', 4336, 37, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 4373), ('absolute indexed wraps top', ['absx', 65520, 53, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 37), ('indirect jump page bug', ['ind', 4351, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 25889), ('indirect jump normal', ['ind', 8448, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 119), ('indexed indirect pointer wraps', ['indx', 254, 1, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13432), ('indexed indirect plain', ['indx', 14, 2, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 43981), ('indirect indexed adds after load', ['indy', 16, 0, 21, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 44002), ('indirect indexed pointer wraps and crosses', ['indy', 255, 0, 240, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 13672), ('indirect indexed result wraps', ['indy', 128, 0, 37, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 21), ('zero page plain', ['zp', 511, 0, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 255), ('absolute Y with X set', ['absy', 8197, 17, 0, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 8197), ('absolute Y indexed', ['absy', 12528, 5, 37, {'0': 52, '1': 18, '255': 120, '254': 86, '16': 205, '17': 171, '4351': 33, '4352': 67, '4096': 101, '8447': 153, '8192': 136, '8448': 119, '128': 240, '129': 255}], 12565)]]
for label, args, expected in fixtures[N-1]:
check(label, solve(*args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| zero page indexed wraps | 17 | 17 | Passed |
| absolute indexed crosses page | 4369 | 4369 | Passed |
| absolute indexed wraps top | 33 | 33 | Passed |
| indirect jump page bug | 25889 | 25889 | Passed |
| indirect jump normal | 119 | 119 | Passed |
| indexed indirect pointer wraps | 13432 | 13432 | Passed |
| indexed indirect plain | 43981 | 43981 | Passed |
| indirect indexed adds after load | 43998 | 43998 | Passed |
| indirect indexed pointer wraps and crosses | 13672 | 13672 | Passed |
| indirect indexed result wraps | 17 | 17 | Passed |
| zero page plain | 255 | 255 | Passed |
| absolute Y with X set | 8193 | 8193 | Passed |
| absolute Y indexed | 12561 | 12561 | Passed |
SHA-256 / 6b4721ce1c1d5d79891fed31a54ec8ca18fc97a8eabafcb6f201e02c44b3c252
Verification & scope
A deterministic bounded teaching model of one emulator rule; the instruction semantics are a stipulated contract inspired by common ISAs and are not a claim of cycle-exact or architectural conformance. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.
Observations recorded using Python 3.12.14 at 2026-09-29T14:51:17.341017+00:00.
Case digest / 2d4cd7e3a414f1f6abcd50176e35be45e72727c1f889f5f1d2a771d36b85d209