DEC engineering drawing numbers
From Computer History Wiki
DEC drawing codes, embedded in the drawing numbers of DEC engineering drawings, allow one to discern what kind of information is conveyed in that particular drawing. A DEC drawing number will be of the form AA-bbbb-x-yy, where 'AA' is the drawing code, 'bbbb' is the device which the drawing is of, 'x' (a digit) is the 'manufacturing series', and 'yy' is the page number within the set. They are often seen with a preceding single-letter code, which indicates the size of the original drawing.
The list of drawing codes, as of circa 1964, was:
| Code | Meaning |
|---|---|
| AD | Assembly Drawing |
| AR | Arrangement Drawing |
| BD | Functional Block Diagram |
| CD | Cable Diagram |
| CP | Component List |
| CS | Circuit Schematic |
| FD | Flow Diagram |
| IC | Interface Cabling Diagram |
| LO | Layout Drawing |
| MU | Module Utilization Drawing |
| PL | Parts List |
| RS | Replacement Schematic |
| SD | Specification Drawing |
| TD | Timing Diagram |
| UA | Unit Assembly |
| WD | Wiring Diagram |
| WL | Wiring List |
Additional drawing codes, seen in later print sets, and their apparent meaning (where possible), are:
| Code | Meaning |
|---|---|
| AH | Assembly Hole Layout |
| AL | Accessory List |
| CO | Co-ordinate Hole Location List |
| DC | Decal ? |
| DD | Drawing Directory |
| EC | Etch Cut |
| IA | ? Assembly? |
| MD | Module ? |
| IS | ? Specification? |
| MH | Module ECO History |
| PC | PCB ? |
| PS | Parts ? |
| SP | Specification? Procedure? |
| TC | Table of Contents |
| UA | Unit? Assembly? |
| WT | Wiring ? |
