CP/M

16 blank lines deleted. <Did MP/M run on Z-80s? BTW, is there a reasonable chance the CP/M on Yes and 8080s as well. The later version for 8088 were called CCPM (concurrent cpm). IN both cases they were multiuser/multiprocess OS that were really better than most. The z80 version was pretty decent on a 6 or 8mhz banked machine that had DMA for disk IO. The DMA was important as some hardware sued the cpu spinning in tight loops to do PIO to floppies and HDs, very inefficient used of cpu cycles. A common use for MPM was to use it for disk services to multiple slaves running cpm2(or 3) or CPnet. A crate constructed that way could easily have a z80 per user plus the MPM server and provide excellent response in a compact box. TELTEK, KONAN, macrotech and others offered cpus boards for both services. The difference in the boards were generaly amount of ram and presence of disk interfaces. <one micro w/5.25" disks be compatible with another with 5.25" disks, <i.e. my apple with a C-128? Also, if a computer can run CP/M 3+ can it Apple is weird with their formats, nearly hardsector. C-128 has a few compatable and incompatable formats. The rest were all over the map. Allison