Mystery HP 1000 board

CuriousMarc curiousmarc3 at
Wed Jun 15 21:49:20 CDT 2016

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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