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.

According to Brian Johnson (and verified by DVegro):

"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

...are all from the 5100 series so they should be 100% interchangable."

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:

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]

The "Package" types are as follow:

 

40 = 40 pin DIP .6"

 

64 = 64 pin DIP 1", .05" pin spacing

 

28 = 28 pin DIP .6"

 

tsop = TSOP surface mount package

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

 

Contributors:

Clay Cowgill (clay@yahoo.com)
Greg Kam
(gkam@ca.newbridge.com)
Brian Johnson
(bljohn2@uswest.com)
Dave
Grohowski(DVegro@aol.com)
Kevin Klop (
mowerman@erols.com)


Updated: 5/5/2000