Namco Part Numbers

The following list is an index of Namco "custom" chips found in the Namco Arcade games. The list is meant to provide a source for cross-referencing replacement parts. Parts are indexed in ascending order based on the "chip number" printed on the top of each chip.

In some cases "older" chip types have a number that's the same as a "newer" chip. The "older" chips are distinguished by a four digit-part number.

"I've been under the impression that the Namco chips were the same if their first two numbers match. For example, the following IC's...

5154 Dig Dug (Jap)
5156 Xevious (Jap)
5164 Dig Dug
5171 Xevious
5180 Pole Position

I'm figuring out the functions of the chips over time (usually when something goes wrong), but right now I can say the following (comments in brackets [ ] are functions described in an Atari memo:

Namco Part Number	Game	Package
00xx	Dig Dug (3rd version)
00xx	Dig Dug (Jap)
00xx	Dig Dug	28
00xx	Dig Dug (2nd version)
00xx	Galaga
00xx	Super Pacman
21	Gaplus
26	Gaplus
27	Alien Sector	40
27	Galaga '88
27	PacLand	40
27	Rolling Thunder	40
27	Splatterhouse
29	PacLand	40
29	Gaplus
30	Alien Sector	64
30	Galaga '88
30	PacLand	64
30	Rolling Thunder	64
30	Splatterhouse
31	Alien Sector	48
33	Gaplus
34	Gaplus
36	PacLand
39	Alien Sector	40
39	Galaga '88
39	Rolling Thunder	40
39	Splatterhouse
41	Alien Sector	40
42	Alien Sector	tsop
42	Rolling Thunder	tsop
43	Alien Sector	64
43	Rolling Thunder	64
48	Alien Sector	64
48	Galaga '88
48	Rolling Thunder	40
48	Splatterhouse
115	Rolling Thunder	40
117	Splatterhouse	tsop
121	Splatterhouse	tsop
123	Splatterhouse
130	Rolling Thunder	40
133	Splatterhouse	tsop
153	Galaga '88
02xx	Dig Dug (3rd version)
02xx	Dig Dug (Jap)
02xx	Dig Dug	28
02xx	Dig Dug (2nd version)
02xx	Galaga
02xx	Pole Position
03xx	Xevious (Jap)
03xx	Pole Position
03xx	Xevious
03xx	Bosconian
04xx	Dig Dug (3rd version)
04xx	Dig Dug (Jap)
04xx	Dig Dug	28
04xx	Dig Dug (2nd version)
04xx	Galaga
04xx	PacLand
04xx	Mappy
04xx	Pole Position
04xx	Super Pacman
05xx	Galaga
05xx	Bosconian
06xx	Dig Dug (3rd version)
06xx	Dig Dug	28
06xx	Dig Dug (2nd version)
06xx	Dig Dug (Jap)
06xx	Xevious (Jap)
06xx	Galaga
06xx	Bosconian
06xx	Xevious
06xx	Pole Position
07xx	Pole Position
07xx	Mappy
07xx	Dig Dug (3rd version)
07xx	Dig Dug (Jap)
07xx	Dig Dug (2nd version)
07xx	Dig Dug	28
07xx	Galaga
07xx	Bosconian
07xx	Xevious (Jap)
07xx	Xevious
07xx	Super Pacman
08xx	Xevious
08xx	Galaga
08xx	Bosconian
08xx	Pole Position
08xx	Dig Dug (2nd version)
08xx	Dig Dug (3rd version)
08xx	Dig Dug (Jap)
08xx	Dig Dug	28
08xx	Xevious (Jap)
09xx	Pole Position
10xx	Pole Position
11xx	Xevious (Jap)
11xx	Xevious
11xx	Gaplus
11xx	Mappy
11xx	PacLand
11xx	Super Pacman
12xx	Xevious (Jap)
12xx	Mappy
12xx	Xevious
12xx	PacLand
12xx	Super Pacman
13xx	Xevious (Jap)
13xx	Xevious
13xx	PacLand
15xx	Gaplus
15xx	Mappy
15xx	Super Pacman
16xx	Mappy
16xx	Gaplus
16xx	Super Pacman
20xx	Gaplus
50xx	Xevious
50xx	Xevious (Jap)
50xx	Bosconian
51xx	Dig Dug (3rd version)
51xx	Dig Dug (Jap)
51xx	Xevious (Jap)
51xx	Dig Dug (2nd version)
51xx	Dig Dug	40
51xx	Xevious
51xx	Galaga
51xx	Bosconian
51xx	Pole Position	40
52xx	Pole Position	40
52xx	Bosconian
53xx	Dig Dug (Jap)
53xx	Dig Dug (3rd version)
53xx	Dig Dug (2nd version)
53xx	Dig Dug	40
53xx	Pole Position
54xx	Xevious (Jap)
54xx	Xevious
54xx	Galaga
54xx	Bosconian
54xx	Pole Position
56xx	Super Pacman
58xx	Gaplus
58xx	Mappy

Number	Short Name	Description
54xx	Sounds	Generates Explosion Sounds (possibly a custom Z-80?) [Mux 4 Channel Audio Generator]
53xx	Steering Input	[Custom 4Bit Micro/Handles Steering/sw/read]
52xx	Audio Processor	[Audio Processor 4 Bit Voice]
51xx	Input	Player controls, DIP switches, etc [Custom 4 bit I/O - Coins]
50xx	Sound Sequencer	[Sound Sequencer]
13xx	Horizontal Scroll	[Horizontal Scroll]
12xx	Sprite Position	[M.OBJ. Position]
11xx	Playfield Shift Register	[Datashift Playfield Register]
10xx	Micro Buffer Data	[Micro Buffer Data]
09xx	Sprite Ram Buffers	[M.OBJ Ram Buffers]
08xx	Bus Controller	(basically the same as Pacman's "285" Sync Buss Controller) [Multi-CPU Bus Controller]
07xx	Clock Divider	(generates horizontal and vertical timing pulses divided down from master clock) [Sync Generator]
06xx	Bus Interface	[Custom 50's Controller]
05xx	Star Generator	(tapped pseudo-random feedback shifter-- makes scrolling starfield)
04xx	Bus Interface	Motion object and scratch RAM to CPU bus interface [M.Obj Controller]
03xx	Buffer, Playfield Data	[Buffer, Playfield Data]
02xx	Custom Shifter	Custom shift register for data from graphics ROMs [Shift Register]
00xx	VRAM Addresser	(basically the same as Pacman's "284" VRAM Addresser) [Video Ram Addresser]

	40 = 40 pin DIP .6"
	64 = 64 pin DIP 1", .05" pin spacing
	28 = 28 pin DIP .6"
	tsop = TSOP surface mount package