Mac GUI

Reading CP/M disks


comp.os.cpm

Author: Prime
Date: 12 Feb 2012 12:50 pm

Hi all,

I have some CP/M disks that where formatted on a BBC Z80 second processor  
running Opus DDCPM. I have booted up the original system and can read the  
diks on there without problems, vut would like to be bale to get the  
files off them to something more modern.

The files I'm trying to extract are mostly either wordstar documents or  
Z80   and 6502 source files.

Now the oddball thing about theese CP/M disks is that the first couple of  
tracks are FM / Single density whilst the rest of the disk is MFM /  
Double density.

I have available to me a machine that I can boot into PC-DOS, Windows 98,  
Windows XP or Linux.

I can scan the disks with Anadisk, and am able to read them on the PC's  
5.25" 1.2MB drive, and have tried using the dump command within Anadisk  
to make a raw dump of one of the disks, which seemed to work ok.

So is it possible to write a disk def for something like 22Disk or  
cpmtools to read the data off these disks.

The specific details of the format I have availabe to me are :

> Double density discs formatted with DDCPM:
>
> Tracks 0-2 formatted Single Density
> Tracks 3-159 formatted Double Density
>
> Single density tracks are 10 x 256 byte sectors per track
> Sector skew of 2
>
> Double Density tracks are 10 x 512 byte sectors per track
> Sector skew of 1
> Sector interleave of 2
>
> CP/M allocation unit block size of 4k
> 256 Directory entries (filenames)

Cheers.

Phill.




Reading CP/M disks
112 Feb 2012 12:50 pmPrime
212 Feb 2012 1:45 pm|- Julian Smith
312 Feb 2012 2:01 pm|  \ Julian Smith
412 Feb 2012 2:33 pm|- David Schultz
512 Feb 2012 3:43 pm|- Ole Christensen
612 Feb 2012 6:41 pm|- Axel Berger
713 Feb 2012 1:02 am|  \ Bill Leary
813 Feb 2012 1:28 am|     |- glen herrmannsfeldt
913 Feb 2012 2:08 am|     |- Roger Ivie
1013 Feb 2012 12:18 pm|     |  |- Bill Leary
1114 Feb 2012 1:00 am|     |  \ BobH
1213 Feb 2012 1:43 pm|     \ Axel Berger
1313 Feb 2012 11:12 pm|- jgharston
1414 Feb 2012 5:18 am\ s100guy
1516 Feb 2012 12:59 pm   \ Phill Harvey-Smith