PDP-11/70 rescued!

From: CLASSICCMP_at_trailing-edge.com <(CLASSICCMP_at_trailing-edge.com)>
Date: Fri Oct 23 08:43:31 1998

>While I don't regret rescuing this stuff, I have no clue how long it will be
>until I could ever power this stuff on. The Hut has its own 60 Amp feed
>seperate from the house, but 110/220, no three-phase power. I suppose I
>could purchase/rig-up a 220V<->3Ph mechanical converter,

You don't need three-phase for the equipment you got - if you look at
the DEC power controllers, they just split out the three phase into
three 120VAC circuits which power the individual boxes. Especially
as you have MOS instead of core memory, 30 Amps will be plenty for a CPU,
memory, and a couple of Fuji Eagles.

Some big Massbus disks (and their Memorex and CDC mechanical equivalents)
do need three-phase for the drive motor, but I didn't see these in your
list.

>P.S. ISTR that PDP-11/70's and VAX-11/750's use the same hex-height 39-bit
>ECC memory boards. Is this true?

Assuming you have the DEC MK11 memory boxes, yes this is true. There
are also third-party memory boards available for 11/70's; my favorite
are the board sets that pop into the 11/70's backplane and give you
4 Megs of cache memory, so there's no need for memory boxes!

-- 
 Tim Shoppa                        Email: shoppa_at_trailing-edge.com
 Trailing Edge Technology          Voice: 301-767-5917
 7328 Bradley Blvd                 Fax:   301-767-5927
 Bethesda, MD, USA 20817
Received on Fri Oct 23 1998 - 08:43:31 BST

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