INDEXED-INDIRECT STORES RESOLVE BOTH POINTER BYTES BEFORE WRITING

MOS manual section 6.10 fixes opcode, pointer, discarded-base, pointer-low and pointer-high cycles for ($nn,X). Pinned Stella revision 90d01ecb supplies the paired write endings for STA $81 and SAX $83: after the same two zero-page-wrapped pointer reads, cycle six writes A or A-and-X only to the assembled address.

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