new find: an Intel MDS 800

From: Dwight K. Elvey <>
Date: Mon Nov 1 10:13:33 2004

 The controller boards for DD were not that hard to talk
too. The fact that they used the 3000 series had little
effect on the main bus interface. It was just some simple
I/O port operations to do disk I/O. It was actually simpler
than the typical WesternDigital chips.

>From: "Joe R." <>
> That's interesting. I've never even heard of a white MDS-800 before. Was
>it painted white originally or was it painted over an orginal blue one?
> I think you need a lot more than rewriting the BIOS to handle DD disks.
>Intels DD controller has a 3000 series bit-slice CPU and some other odd
>circuitry to handle DD.
> Joe
>At 11:39 AM 10/29/04 +0200, you wrote:
>>I have a white MDS 800 System. It was sold in Germany by Siemens and they
>>relabelled it to SME 800 ("Siemens Microcomputer Entwicklungssystem").
>>It has an external 8"-double drive and a dumb terminal. Inside it is all
>>Intel. The only thing they changed internal: The glued "Siemens"-labels
>>over the original Intel-logos on the PCBs.
>>You can see it:
>>We are running ISIS-II inclusive KERMIT on it. One time Christian Corti
>>succeeded to boot a CP/M 2.?. But in the meantime this disk was damaged.
>>I found a very old CP/M source, dated "11/21/75" in the net, written in
>>PL/M and was able to translate it with the original PL/M-compiler
>>written in FORTRAN (dated: JAN 1975) on our SUN 4/260.
>>What is needed: To adapt the original BIOS for single density disks to
>>the double density drives on our system and to make bootable floppies.
>> Klemens
>>On Wed, 27 Oct 2004, Steve Thatcher wrote:
>>> I lived in Munich, Germany for a year and a half back in 1983 while I was
>>> working for Applied Microsystems. I developed a couple of the EM series
>>> emulators and ran into a number of remarked Intel systems that said
>>> on the outside.
>>>> I've never heard of a Siemans system. The white MDSs that I've seen all
>>>> have the standard Intel markings and labels. (I've got one sitting about 3
>>>> feet from me as I type.)
>>>> Joe
>>klemens krause
>>Stuttgarter KompetenzZentrum fyr Minimal- & Retrocomputing.
Received on Mon Nov 01 2004 - 10:13:33 GMT

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