Mystery HP 1000 board

Yes, yes, I remember! [furiously searches email archive] Jay said: "The large board on the left. I am fairly sure that I have one. I am trying to remember what it was. I know that it made the E series into specific test instrument. I do remember that you can remove it and it's a normal E. I'll go see if I can find any notes I made on it. I seem to recall it made the E cpu into a dedicated fourier analysis machine or something.." At the time I didn't even have the card info or number. But nothing came out of my google-ing. Is that the board you were thinking of? Did you ever find any more documentation on it? Do you know which software/hardware this works with? Anyone else knows? Marc -----Original Message----- From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Jay West Sent: Wednesday, June 15, 2016 8:01 PM To: 'General Discussion: On-Topic and Off-Topic Posts' Subject: RE: Mystery HP 1000 board 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? Marc