[img] Hard Drive support for BBC CP/M
 MDFS::Software.CPM.Acorn.HardDrive Search  

The BBC Z80 CoProcessor can run CP/M, and usually uses up to two 400K floppy disks. The version 2.00 Z80 MOS supplied with the Acorn Business Computer can access a hard drive. Unfortunately, the system files required appear to be lost, and the code fiddles directly with the SCSI hard drive hardware, making it difficult to use other filing systems or hard drives.

This modification of the v1.20 Acorn CP/M BIOS provides access to a CP/M drive C: that can reside in an image file on any filing system and on any drive. The image file is a standard 'MyZ80' (&19B) image file and can be accessed with CPMFS on RISC OS or MyZ80 on DOS/Windows.

HDBIOS.zip 28K  Hard Drive BIOS with sample hard drive disk image.
CPMHD.ssd 18K  Acorn CP/M system disk with Hard Drive BIOS already installed.
CPMHD.dsd 20K  Acorn CP/M system disk with Hard Drive BIOS already installed.
HDBIOS.src 11K  Source for Hard Drive BIOS (Z80 BBC BASIC).
READ.ME 5K  Documentation for Hard Drive BIOS.


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Last update: 12-Sep-2010