I'm just about to consider firing up one of my old CP/M S-100 boxes just for
spite and to see if I can get it to run the way I want. It starts with
wanting the CPU board, and I'll probably have to try several, to run the 8
MHz Z-80H I still have lying about somewhere. Then I want to run the 8"
Shugart hard drive using an XCOMP HDC board set which is purported to work
better than the MSC board I used on my own station back about 20 years. If
I can get the CPU to run, and I believe I have fast enough static memories
to handle that, no wait states required, I think, then it might be
interesting to see what one can squeeze out of the old 8" winchester. I
know I can whack up a wire-wrapped version to work, and then I won't have to
worry about the bus timing at all, at least for starters, because a FDC/HCD
combination will easily fit on a board with all the necessary logic, RAM,
ROM, and I/O.
Dick
-----Original Message-----
From: Allison J Parent <allisonp_at_world.std.com>
To: Discussion re-collecting of classic computers
<classiccmp_at_u.washington.edu>
Date: Wednesday, March 31, 1999 9:12 PM
Subject: Re: Rebirth of IMSAI
>
><That was along time ago. Perhaps it was 56K rather than 48. All my CPM
><systems, and I had several at the time, used 64K, though that's a small
><difference nowadays.
>
>No, It's a result of knowing the machine and CPM and programming around it.
>The base distribution of CPM for that machine would not use memory above
>E800h due to the controller. It didn't meant it couldn't be there. If you
>didn't program around that the best you could do was 52k.
>
>All my other machines have 64k of ram or more. The practical aspect of it
>is that most apps 48k was plenty and only a few really wanted that little
>bit more.
>
>Oh the softsectro controller using the 765... The IO was also memory mapped
>into the FFF0->FFFFh segment of ram. that way I could use the more
flexible
>memory ops that were also faster and also the controller could be
>co-resident.
>
>Allison
>
Received on Wed Mar 31 1999 - 23:27:43 BST