Mystery HP 1000 board

Well what the heck, found it, we have one right here in the CHM collection!!! It's part of an HP 5451C Fourier Analysis system, and there are quite a few other bits needed besides the HP-1000 and its many weird cards! I think I saw them from the guy that I bought the HP 1000 from. I might go back. http://www.computerhistory.org/collections/catalog/102692715 A later revision of the 5451A system I had found below with the nice lady picture. Marc http://nevadabarry.com/electron.html#HP%20Test%20Equipment HP 5443 05443-60047 05443-60042 05443-60031 MIOB Interface 05443-60050 Booster Microcode 05443-60057 C (13803F?) 05443-60071 A (22803F) NO Connection with the site/person/etc .. just passing it on On Wed, Jun 15, 2016 at 8:00 PM, Jay West <jwest at classiccmp.org> wrote: > 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 classiccmp.org] On Behalf Of > CuriousMarc > Sent: Wednesday, June 15, 2016 9:49 PM > To: cctalk at classiccmp.org > Subject: Mystery HP 1000 board > > Can anyone identify this HP board (see link to pictures)? > > https://goo.gl/photos/BBuAV1oozWNSqeUTA > > 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 upgrade?