Help collecting gear from west of Chicago
drb at msu.edu
Mon Jun 6 11:15:46 CDT 2005
> > Teradyne-built items; I don't recognize the bus -- two edge connectors,
> > each wider than qbus. It doesn't look like the unibus cards I've seen.
> Unibus and Qbus use the same double-sided 36 pin (18 pin per side)
> 0.125" pitch connectors. Q bus boards are normally dual or quad,
> Unibus are normally quad or hrx.
These in the Teradyne chassis have 60-pin edge connectors. The full
width boards are about the same size as quad-width UNIBUS boards.
The end of the chassis with the memory cards has two such connectors.
The other end has only one connector, and an assortment of I/O cards --
variously full of UARTs, driver transistors, ADC, etc and connected
to about 5 substantial cables. Haven't followed the cabling to see
what goes into the main CPU yet. Both front and back of this cab
are chock full of stuff so it's hard to see inside.
Given that two of the boards in the teradyne chassis are memory,
I'd expect some kind of CPU, but the other cards on that end of
the bus don't seem to have appropriate parts. Perhaps some kind of
marble machine? I'll have to post photos.
> > The first small cabinet (9764, I think?) contains three RA81 drives;
> > one is labeled 'bad hda'.
> I hope you locked the positioners on those drives (white lever on
> top of the HDA) before moving them, otherwise you have 3 bad HDAs now.
Unfortunately, didn't have my hands on the machine until it arrived
in my driveway. I suspect the machine was moved before the auction
started anyway. Yesterday I finally got inside the two drives
which are not labeled bad. One has no hda at all; the other is not
locked down. Sigh. Is this a guaranteed bad, or just highly likely?
Any way to test or estimate non-destructively? I imagine working
RA81 HDAs are unobtainium?
Still haven't opened the RL02s. Seems like there's something
(a powered solenoid) locking the top latch? Any way to defeat it?
Started through the manuals from Bitsavers this morning, but haven't
found the golden page yet.
> The 11/44 PSU is the second most complicated I've ever worked on
> (it was the most complicated until I worked on an HP9845..) It's
> also got some lethal features, like 400V DC, straight from the mains,
> on barrier strip terminals inside. Please ask here (or me directly)
> before diving inside the PSU.
Thanks for the warning. For curiosity, would the wimpy US power
version have 400V, or more like 200?
Supposedly I have a set of 11/44 prints on the way from .nl which
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