Following on the work to port CP/M to C, I decided to take on MP/M from 1979, since it has multi-user capability. With Claude’s help this was a 2-stage process: The net result is C code that compiles to 32-bit real mode MP/M. You can see it in QEMU here: qemu-system-i386 -drive file=build/mpm86c.img,format=raw,if=floppy -boot a…
Part 1 here. Well, i discovered that none of the CP/M commands that are .com files were present. So we now have: All of the .COM’s were “back-ported” from the original assembler code to C so that they can now be compiled for different platforms. BASICBAS.COM, BASICINT.COM and BASIC.COM are the original Basic-e from 1976,…
I’ve been interested in CP/M for a while. The source code for CP/M from “way back in the time tunnel” is available at the CHM and multiple other places. The challenge however was that CP/M source is in assembler code for 8080 and z80. I wanted to run it on i386 hardware. So, with the…