Atari 2600 / F200
BEING VERIFIEDDCP FLAGS COME FROM THE POST-DECREMENT COMPARE
- STATUS
- BEING VERIFIED
- AREA
- CPU
- RECORDED
- 2026-07-15
- PUBLIC SOURCE
- Research dossier / finding 200
- RECORD ID
atari2600-f200- SNAPSHOT
d8dcf6d8dd492341
HYPOTHESIS: DCP decrements its memory operand modulo 256 and then performs CMP A against that new byte. Memory changes, A does not, and final C/N/Z come from the comparison rather than DEC's intermediate result.
Raw traces, ROM material, local paths, and personal data are not part of this public record.
01INPUT IDhash receipt
02BYTE MAPdecode coverage
03CPU STATEtrace comparison
04BUS / TIMEordered effects
05OUTPUTvisual · audio · input
06ARTIFACTbuild identity