I have one of the Cirtech CP/M boards that plugs into the 6502 socket for the //e. I have disassembled all of the non-DRI bits and there is some copy protection in there that uses the 6502 <-> Z80 address PROM and the A11 line to check it's running on the right hardware.
While this is fine for...
I've just finished off disassembling the Cirtech CP/M plus (V1) implementation for a 128K Apple //e and it supports any Apple ProDOS hard drive upto 32Mb in size.
Sadly it uses eight 512 byte sectors per track for its geometry. I have a feeling that going to 24 (It needs 12K of boot sector) or...
I've just retrieved an Apple //e from my mums loft and while I have the disks I can't find the manual for the Cirtech Z80 CP/M Plus board installed (it plugs as a daughter board into the 6502 socket so I'm guessing it's very similar to the //c)
Does anyone have a scan, the only online version I...