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From: boortz@sics.se (Kent Boortz)
Newsgroups: comp.os.cpm
Subject: CP/M internals?
Message-ID: <1990Aug29.222738.4302@sics.se>
Date: 29 Aug 90 22:27:38 GMT
Sender: news@sics.se
Distribution: comp
Organization: Swedish Institute of Computer Science, Kista
Lines: 17


Could someone explain to me how a typical CP/M (8085) system is working?
What parts are there, and where are they (ROM/RAM/disk)? 
What functions do they have? How do they call each other? 
How is the memory organised? Maybe you can explain the boot process?

What parts of the CP/M OS can I replace with freeware/shareware alternatives?

Why do I ask this? I am trying to write a hardware emulator for 8085 in MC68020
assembler (just for fun) and is curious if it is possible, with not to much
work, to port a CP/M system to it. The ideal case would be a OS that used
the OUT and IN instructions for all communication with the hardware, except
the screen that could be memory mapped.


Kent Boortz
boortz@sics.se