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  1. P

    Cirtech CP/M board, help required for emulation.

    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...
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    CP/M Recommended disk geometry and directory sizes

    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...
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    Apple //e Cirtech Z80 card looking for manual.

    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...
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