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OP used the word "interrupt" so I was thinking about the INT 21h API into MS-DOS. I never did any coding under CP/M. What assembler coding I did under MS-DOS th
by EvanAnderson 4y ago
OP used the word "interrupt" so I was thinking about the INT 21h API into MS-DOS. I never did any coding under CP/M. What assembler coding I did under MS-DOS that touched the PSP was mostly concerned w/ pulling the command line out. I can't say that I ever noticed the stuff in there that's clearly for CP/M compatibility. I do remember exiting COM programs using "RET", which transferred control to CS:0000 where an INT 20h was always present. I'm reading that was for CP/M compatibility, too. Neat.