On Thu, Jun 16, 2016 at 11:08 PM, tony duell <a...@p850ug1.demon.co.uk> wrote: > 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.
On some early HP gear (1960s), the subassemblies and model-specific parts have a 4x5 or 4x4 part number, with the base model number as the first part, rather than the later 5x5.
