REFORGE
Atari 2600 / F257
BEING VERIFIED

ABSOLUTE-INDEXED READS MAKE PAGE CROSSING AN EXECUTED BUS CHOICE

STATUS
BEING VERIFIED
AREA
Timing / bus
RECORDED
2026-07-16
PUBLIC SOURCE
Research dossier / finding 257
RECORD ID
atari2600-f257
SNAPSHOT
f114355884d03a2c

MOS manual section 6.1, Example 6.6 gives the no-cross sequence: opcode, BAL, BAH, then effective data in four cycles. Example 6.7 shows that a page cross first reads the old-page/new-low address and ignores its data while adding the carry to BAH, then reads effective data in cycle five.

Raw traces, ROM material, local paths, and personal data are not part of this public record.