SDS/XDS Sigma systems
eric940 at gmail.com
Tue Aug 5 01:26:57 CDT 2008
>>Rich Alderson wrote:
>> If anyone on the list is aware of Sigma equipment still in existence, please
>> contact me. I am aware that Honeywell forcibly retired the systems as
>> service contracts expired in the early 80s, and that this will be very rare if
>> it does exist at all.
> Jerome Fine replies:
> Somewhere there should still be a Sigma box that is about the
> same size as a BA23 box. It has a built-in 8" floppy (that can
> also be double sided) that runs using the MSCP controller
> and a hard drive, also using the MSCP controller. The Qbus
> backplane has at least 5 slots, maybe eight. It runs RT-11.
> I also have a number of Sigma ESDI hard disk drive controllers,
> RQD11-EC that I use with Hitachi 5.25" hard disk drive of
> 600 MegaBytes.
> Is this what you are looking for?
This is the wrong "Sigma" type device you are referring to.
The correct Sigma device(s) consisted of, for example, the Sigma 5,
Sigma 7, and Sigma 9 (was there a Sigma 2?) made by Scientific Data
Systems (SDS), which was bought out by Xerox in 1969 and subsequently
named Xerox Data Systems (XDS).
Then, after Xerox abandoned the mainfame industry (circa 1974) --
Honeywell came into the picture and provided service engineering
contracts and maintenance for their products and existing clients.
In other words, the OP is looking out for mainframe type products (or
minicomputer computer products, depending on your definition of
exactly what defines a mainframe vs. minicomputer in this context :-)
I'm not that familiar with the "Sigma" named device you are referring
to, but am familiar enough to know that it is quite a more recent
device than what the OP is looking for.
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