DEC engineering drawing numbers

DEC engineering drawing numbers will usually be of the form Z-AA-bbbb-x-yy, where 'AA' is the 'drawing code' (below), 'bbbb' is the device which the drawing is of, 'x' (a digit) is the 'manufacturing series', and 'yy' is the page number within the drawing set. They are often seen with a preceding single-letter code ('Z' above), which indicates the size of the original drawing (listed below).

Drawing codes

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. The list of drawing codes, as of circa 1964, was:

Code	Meaning
AD	Assembly Drawing
AR	Arrangement Drawing
BD	Functional Block Diagram
BS	Block Schematic
CD	Cable Diagram
CL	Cable List
CP	Component List
CS	Circuit Schematic
DL	Diode List
FD	Flow Diagram
IC	Interface Cabling Diagram
LO	Layout Drawing
ML	Module List (possibly 'Master Drawing List')
MU	Module Utilization Drawing
PL	Parts List
RL	Replacement List
RS	Replacement Schematic
SD	Specification Drawing
TL	Terminator List
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?
IS	? Specification?
MD	Module ?
MH	Module ECO History
PC	PCB ?
PS	Parts ?
SP	Specification? Procedure?
TC	Table of Contents
UA	Unit? Assembly?
WT	Wiring ?

Drawing sizes

Drawings are usually reduced to 11"x17" (A3, in contemporary paper sizes) for inclusion in print sets sent to customers. The list of drawing size codes for the originals, as of circa 1962, was:

Code	Size
A	8-1/2" x 11"
B	11" x 17" (twice 'A')
C	17" x 22" (twice 'B')
D	22" x 34" (twice 'C')
E	Larger than 'D' (most are 30" x 42")

See also

• DEC part numbers

External links

• 'Missing' Digital Equipment Corporation Field Maintenance Print Sets Online