Strange third party board in PDP-11/45

Paul Birkel pbirkel at
Sun Jul 22 01:36:13 CDT 2018

ACT is parked on the upper-right under the handle.
Several variants of "10003" are marked near the left handle.
And it's copyrighted 1976.

ACT = ABLE Computer Technology.

Their first product was PN 10001 (copyright 1976), the A.C.T. Univerter; see "Able_Univerter_Nov81.pdf" on Bitsavers. 

-----Original Message-----
From: cctalk [mailto:cctalk-bounces at] On Behalf Of Bob Smith via cctalk
Sent: Saturday, July 21, 2018 4:44 PM
To: Mattis Lind; General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Strange third party board in PDP-11/45

any identification number sn front or back? can tell from just that shot.

On Sat, Jul 21, 2018 at 2:37 PM, Mattis Lind via cctalk
<cctalk at> wrote:
> This board was sitting in slot 21 of the backplane in a 11/45
> What kind of board is this?
> It has 26 bipolar RAMS. Fairchild 93415 1kbit SRAM.
> The manufacturer might be ACT whatever that is.
> My guess is that it is some kind of cache board? It is connected to both
> unibuses in the machine.
> Better ideas? Documentation?
> /Mattis

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