12 Sep
2006
12 Sep
'06
6:13 a.m.
Subject: RE: CompuPro floppy controller differences
From: "Chuck Guzis" <cclist at sydex.com>
Date: Mon, 11 Sep 2006 09:19:56 -0700
To: cctalk at classiccmp.org
On 9/11/2006 at 8:02 AM Allison wrote:
Interesting, I have both SSSD, SSDD and DSDD media for my CCS system and
none exceed 2 tracks for 8". I have no 5.25" so I cant speak for those.
The DSDD media I have uses the first two tracks of side 2 for data and the
organization if 2 tracks side 1 reserved and the next 75 tracks are data
wrapping around to side 2 (77tracks). The software is as supplied from
CCS to format that media. I wonder if CCS did a change or switch gears
on their format?
I do know it reads SSSD CP/M standard without issues.
My CCS system is 2200 crate with 2501 backplane, 2810 Z80 cpu,
2710 4 port serial, 2704 bus terminator and 2422 FDC. The
only non CCS part is the Compupro Ram16. It's a really
nice system, well documented and very complete software
when I got it. I was used for a development platform for
another CP/M system. The most recent date code on anything
in the crate is early 1981 so I figure it's from around then.
I don't know if this is an early version or later.
Allison
The manual says two tracks on 8" and 3 tracks
on 5.25 with track 00 being
128 byte single density only. NOTE the manual says tracks not cylinders.
All I can relate to you is the number of cylinders before the directory.
What CCS uses the extras for is anyone's guess. My 8" CCS sample is DS MFM
and reserves 4 cylinders for boot.
Cheers,
Chuck