Mystery HP 1000 board

[Curious Marc]

> 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
Many thanks Tony, I didn't know about the "model number of the first instrument that used the assembly minus the zeroes", this explains a lot of things!
Marc