On Tue, Nov 09, 2004 at 09:15:48PM -0000, Jeff Grigg wrote:
> I could pull out the "system interrupt" level API documentation for
> CP/M and MS-DOS version 1. All the calls are the same: Same numbers
> for the same functions, same parameters in the same registers, etc.
> There were only a few small and relatively subtle differences: MS-
> DOS directly supported record sizes, rather than just raw 128 byte
> blocks. MS-DOS supported opening devices, like the console,
> as "files." CP/M had a funny way of switching console, printer
> and "tape reader and puncher" devices, that QDOS/MS-DOS didn't copy.
Jeff, you're really dredging up some old memories for me. Did you ever
see the Clark Calkins CP/M disassembler? I bought a copy. It
disassembled the BDOS, inserting meaningful labels and comments. I read
the whole thing to learn how it worked.
- George
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