DEC part number
From Computer History Wiki
DEC part numbers are generally of the form 'xx-yyyyy-zz' (sometimes the first hyphen is omitted); DEC had a system for their part numbers, such that looking at a part number will generally tell you (based on the leading two-digit 'xx' field) what kind of part it is: chip, cable, etc.
| Class | Type |
|---|---|
| 19 | Interface chips |
| 21 | Processing chips (CPUs, etc |
| 23 | Programmed chips (ROMs, etc) |
| 50 | Printed circuit boards |
| 54 | Assemblies |
| 70 | Cables |
