DEC Gamma-11 units in private collector hands?
philippe at cowpig.ca
Sat Oct 27 10:48:28 CDT 2007
On Sat, Oct 27, 2007 at 12:06:42AM +0100, Tony Duell wrote:
> I don't have one, but I did repair one about 10 years ago (it was still
> being used for 'real' work back then), so I have some idea as to what was
> inside. I never worked on the camera side of things, so I can't comment
> on that.
> The machine consisted of a normal 11/34 processor (I can't rememebr if
> there was a floating point oard in it or not) with a grpahics display
> system, I think it was a VS60. There was an RL11 disk controller linked
> to (IIRC) a single RL01 drive.
> There was also a 5.25" high expanison box. This contains 2 4-slot
> backplanee. One was Unibus, linked to the 11/34 Unius, and contains (IIRC
> again) the RL11 and the Unibus end of a DW11-B. The other was Q-bus, and
> contains the other end of the DW11-B. It also contained 3 special Qbus
> cards which were the interface to the camera. I probably took copies of
> the printsets for those, but don't expect me to find them in the near future.
> The only part I had to repair was the RL11, that was standard. So alas I
> didn't get to look at any of the 'interesting' bits.
Hrmn, this is interesting; I wonder why DEC chose to use an 11/34 for
the Gamma-11, or if the machine was "upgraded" to become a Gamma-11
post-installation. I'm fairly tempted to try to pick up that boardset,
nonetheless... I imagine it is rather difficult to snag anymore though.
Thanks for the details, Tony!
> I don't recall from having not reread this whether this was a PDP-11
> instrument or not, however, but this certainly remindes me of this.
Yeah, these were PDP-11s, as I recall. In skimming the article, that
seems to be what it indicates as well. I can't help but to feel sorry
for the people who were overexposed to radiation in the Therac-25, but
I get the impression that the lesson from it has been learned, but only
after prolonged time in court.
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