CP/M

+AD4-Did MP/M run on Z-80s? BTW, is there a reasonable chance the CP/M on +AD4-one micro w/5.25+ACI- disks be compatible with another with 5.25+ACI- disks, +AD4-i.e. my apple with a C-128? Also, if a computer can run CP/M 3 can it +AD4-run eariler versions? (Note i'm not talking about apps here). Yes, MP/M ran on the Z80 first, then on the 8086. A multi-user Z80 was no speed demon but it was cheap compared to a PDP-11. BTW, the very first initial release of MP/M was actually coded for 8080, the task dispatcher did not save the extra Z80 registers. I discovered it the hard way, reported it to DRI, they fixed it right away. Apparently whatever machine they used to test MP/M was 8080 or 8085 based. Compatibility on floppies was about nil, very very few disks could be moved from one machine to another. If anything, 5.25+ACI- compatibility was worse than 8+ACI- floppies. Any Z80 machine that could run V3 had all the hardware needed to run V2. CP/M V1 was designed only for 8+ACI- SSSD floppies, the BIOS didn't have the drive tables in it to support anything else. Jack Peacock