Comments (1)
iss000
commented on July 19, 2024
Eh, this was epic! There 2 bugs one in cpm65 and one in llvm-mos-sdk!
The long story short, although ldx absolute_16bit,y is fine, stx absolute_16bit,y is completely illegal for 6502.
It took me whole day to find out the problem with llvm-mos-sdk v.4.x.x vs. v.6.x.x.
Here is it:
v.4.x.x silently compiles it as stx zp,y and it seams to work.
v.6.x.x silently inserts invalid op code 0x9b and execution goes to 'BRK' handler.
Interesting is if using explicitly constant for address stx 0x1000,y llvm-mos gives proper error message. So, I'll open an issue at llvm-mos repo too.
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Related Issues (20)
- VT52 waiting for valid escape sequence HOT 1
- Reusing a static FCB for several file operations HOT 3
- "REN"-like command for changing user ID HOT 2
- Multiple drive support HOT 6
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- Arrow-key constants HOT 2
- cpm.h header file needed HOT 2
- munmap_chunk(): invalid pointer HOT 4
- Suggestion: have the CCP zero out the bss for transient commands
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- ccp internal "ren" does not work HOT 2
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