new find: an Intel MDS 800

From: Steve Thatcher <>
Date: Sat Oct 30 12:05:34 2004

the very first MDS800 I worked on in 1977 was SD based and used ISIS (not
ISIS-II). In fact, I even had the paper tape reader and punch to go with
it. Company is long gone of course, but my memory lingers on.

When I spoke about the 8271, I was talking about the IOC board in the
series II and was not talking about the MDS800 because it had no internal
boards other than the bus board all the carded plugged into. The 8271 was
not introduced until 1977 when the Series II was released. The MDS800 was
released in 1975.

Their decision was based on available technology...

At 12:40 PM 10/30/2004, you wrote:
>At 11:48 AM 10/30/04 -0400, you wrote:
> >I thought that the SD controller board set was also bit slice (the series
>II internal was of course 8271 based).
> That's possible but I've never seen a SD board set and I have 8 or nine
>complete machines and about that many more for parts plus hundreds of
>Multibus cards. I guess that anyone that paid for a board set went with the
>DD set. I don't think that the SD set is even shown in the few catalogs
>that I have. I wonder why Intel would use bit slice on the SD board set
>instead of an 8271?
> Joe
Received on Sat Oct 30 2004 - 12:05:34 BST

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