21 Jun
2014
21 Jun
'14
8:41 a.m.
Dwight is correct.
I have the original DRI disks in double density. As far as I can
remember DRI never supported the 8271 directly. I had to make my own
BIOS in order to make a CP/M 2.2 (and 3.0 for that matter) that
supported and/or booted from the 8271 in the MDS Series II.
The original DRI disks supported the two-board set of disk controllers
from Intel. Single density and double density versions
of that board
set were very similar in the way they were driven. The differences
in
BIOS support between single and double density were trivial.
dwight said the following on 6/21/2014 9:55 AM:
I don't recall seeing the 8271 used or refenced
in any of the CP/M releases. I thought they all used
the bios code.
The originals would have used the two card SD controller
as in MDS800 not the series II 8271.
Even so, I thought they used the bios calls and not directly
to the controller.
Maybe it is just brain fade on my part.
Dwight
Date: Sat, 21 Jun 2014 03:11:51 -0600
Subject: Re: image of CP/M disk for Intel MDS wanted
From: spacewar at gmail.com
To: cctalk at classiccmp.org
On Sat, Jun 21, 2014 at 12:32 AM, Chuck Guzis <cclist at sydex.com> wrote:
This archive claims to have both SD and DD
Intellec images of 62K CP/M:
http://www.z80.info/sample_disks/Intellec.zip
That's interesting, but it's all stuff that's been modified to run on
some
Z80 simulator, not on the real MDS. There's a claim that their CP/M double
density image *might* run on real hardware. Their SD image definitely
won't unless the MDS has the optional two-card SD controller, rather than
the MDS' built-in 8271 controller. I believe the original DRI disk should
run with the 8271. Hopefully someone somewhere has saved a genuine DRI
disk.
If all else fails I can hook up a logic analyzer to my MDS to figure out
where things are going awry.