TXA and TYA are broken - Githubissues

pskupinski / 65816.js

A JavaScript 65816 Microprocessor Emulator

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Open KarolS opened 4 years ago

KarolS commented 4 years ago

SEP #$30
LDA #1
XBA
LDX #3 
TXA
REP #$30
STA $700

Observed:

[$701]:[$700] contains $0003

Expected:

[$701]:[$700] should contain $0103. An 8-bit transfer should not touch the high bits of the register.