Mystery HP 1000 board

Jay West jwest at
Wed Jun 15 22:00:46 CDT 2016

I have one of those boards. You sent me an email about it and I replied a
week ago :)

-----Original Message-----
From: cctalk [mailto:cctalk-bounces at] On Behalf Of CuriousMarc
Sent: Wednesday, June 15, 2016 9:49 PM
To: cctalk at
Subject: Mystery HP 1000 board

Can anyone identify this HP board (see link to pictures)?

It was at under the main board of a newly acquired HP 1000-E, next to the
firmware board. It says HP 54427-60050 Booster Microcode. It has 5 bitslice
SN 74S181 chips at the back. So I surmise maybe it's a late ALU booster




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