Date   : Wed, 16 Jan 2008 00:06:38 +0000
From   : jgh@... (Jonathan Graham Harston)
Subject: Z80 CP/M Software Discs

Michael Howard wrote:
> Am I correct in believing that the set of 7 discs for the Z80
> co-processor are simply 80 track DFS discs each containing a CP?M 'image'?
 
Almost. They are double-sided 80 track DFS disks, on side 0 is a
dummy file called CPMDISC that occupies the whole of side 0, but
does not contain the whole of the CPM filesystem.
 
The CPM filesystem starts at track 0 sector 0 (ie, the DFS
catalogue). Part of the CPM filesystem has some space reserved in
it to contain the DFS catalogue. CPM doesn't look fo the CPMDISC
file, it accesses sectors directly.
 
See http://mdfs.net/Docs/Comp/Disk/Format
 
-- 
J.G.Harston - jgh@...                - mdfs.net/User/JGH
Sheffield Boundary Review at http://mdfs.net/User/JGH/Docs/Politics/ParlReview