Mystery HP 1000 board

[tony duell]

> I the HP -> Agilent -> Keysight world when you see part numbers start
> with a 0 (zero) in many cases the instrument they were for or in this
> case part of, is the digits that follow.

As I understand the HP numbering scheme....

Components have part numbers with 2 groups of 4 digits. The first
group is the type of component, for example 1820 is digital ICs,
1818 is memory, 1826 is linear ICs, 1853 is PNP (silicon?) transistors,
1854 NPN (silicon?) transistors, 9100 is transformers, etc. There was
a list given either in one of the service manuals I read or in Bench
Briefs, but I can't find it.

Subassemblies (like PCBs) have part numbers with 2 groups of 5
digits. The first group is the model number of the instrument that
first used that subassembly, padded with leading zeros. So for
example the CPU data path (ALU and registers) board in an
HP9830 is an 09810-66514, as it was first used in the HP9810.

-tony