Zaxxon
Sega/Gremlin, 1982
Other boards with the same pinouts (with the exception of some control
inputs):
Congo Bongo
Future Spy
Super Zaxxon
The original posting of this pinout had the parts side and solder side
reversed. This version of the pinout fixes that error and discusses how
to change to composite sync from positive to negative JAMMA compatible.
Thanks to Rick Schieve for pointing this out. The schematic that shows
the settings for this switch (SW4) is in the Zaxxon manual, drawing
number 834-0214, IC Board A, sheet 13.
Also, thanks go to Rick for pointing out that the Zaxxon pinout is shared
by the above games.
Again, please let me know if you find any errors and I will correct them
(holcomb@halcyon.com).
The following boards identify the Zaxxon boardset:
Sound II, PCB 171-0078 (834-0213 & 834-0214 sticker, 44-pin edge connector)
Video II, PCB 171-0079 Rev 3 (834-0257 sticker, bottom board)
The Sound II board has 5 EPROMs and 4 socketed ICs.
Location Chip Identification
-------- -------------------
U23 IC 8255AC-5 (Sound Chip)
U24 IC Z80A (MK3880-4) (CPU)
U27 IC 2564 EPR-1473 turbo mino type (ROM 3D?)
U28 IC 2564 EPR-1474 turbo mini type (ROM 2D)
U29 IC 2532 EPR-1475 turbo mini type (ROM 1D)
U68 IC 2716 EPR - 1468, Zaxxon (ROM 14)
U69 IC 2716 EPR - 1469, Zaxxon (ROM 15)
U72 IC TPB24S10PR - 1472, Zaxxon (16-pin Custom IC?)
U98 IC TPB28L22PR - 1471, Zaxxon (20-pin Custom IC?)
The sound chip at location U23 is labeled:
NEC Japan
E2113X-203
D8255AC-5
The CPU at location U24 is labeled:
NEC Japan
E94126-915
D780C-1
15 -----------9
-|A7 D3|-
1| |10
-|A6 D2|-
2| U72 |11
-|A5 D1|-
3| |12 This chip is labeled on the chip:
-|A4 D0|- (Texas Instruments logo) J214X2
4| | MR017
-|A3 |
7| |
-|A2 |
6| |
-|A1 |
5| |
-|A0 |
|-- -- |
|CS CS |
------------
13| 14|
-------
+5V
20|
14 -----------19
-|D7 A7|-
13| |18
-|D6 A6|-
12| U98 |17 This chip is labeled on the chip:
-|D5 A5|- (Texas Instruments logo) J214A2
11| |5 MR016
-|D4 A4|-
9| |4
-|D3 A3|-
8| |3
-|D2 A2|-
7| |2
-|D1 A1|-
6| |1
-|D0 A0|-
|G1 G2 Gnd| G1 and G2 are connected to pin 10
------------
|15|16 |10
---------|
The Video II board has 10 EPROMs and 2 socketed ICs.
Location Chip Identification
-------- -------------------
U42 IC 93422 (22-pin Custom IC?)
U62 IC 93422 (22-pin Custom IC?)
U77 IC 2564 EPR 1465 (ROM 11)
U78 IC 2564 EPR 1466 (ROM 12)
U79 IC 2564 EPR 1467 (ROM 13)
U90 IC 2564 EPR 1459 (ROM 7)
U91 IC 2564 EPR 1458 (ROM 8)
U92 IC 2564 EPR 1457 (ROM 9)
U93 IC 2564 EPR 1456 (ROM 10)
U111 IC 2564 EPR 1462 (ROM 4)
U112 IC 2564 EPR 1461 (ROM 5)
U113 IC 2564 EPR 1460 (ROM 6)
-----------17
| CS2|-
| ---|19
| CS1|-
| --|18
| OE|-
| --|20 This chip is labeled on the chip:
| WE|- 93422 PC
| |1 F 8218
| A|- SINGAPORE
| |4
| A|-
| U42 |21
| & U62 A|-
| |7
| A|-
| |6
| A|-
| |5
| A|-
| |4
| A|-
| |3
| A|-
| |2
| A|-
10| |9
-|D0 DI|-
12| |11
-|D0 DI|-
14| |13
-|D0 DI|-
16| |15
-|D0 DI|-
------------
There are no empty sockets on either board.
44-pin connector at location P5 on Assy IC Brd A, Sound II
SOLDER SIDE | PARTS SIDE
------------------------------------|--------------------------------------
Gnd | A | 1 | Gnd
--------------------------------|---|---|----------------------------------
Gnd | B | 2 | Gnd
--------------------------------|---|---|----------------------------------
+5V | C | 3 | +5V
--------------------------------|---|---|----------------------------------
+5V | D | 4 | +5V
--------------------------------|---|---|----------------------------------
-5V | E | 5 | -5V
--------------------------------|---|---|----------------------------------
+12V | F | 6 | (+12V)
--------------------------------|---|---|----------------------------------
[from P4-4 & to Spkr?] Spkr - | H | 7 | Spkr + [from P4-3 & to Spkr?]
--------------------------------|---|---|----------------------------------
(Coin Meter A) | J | 8 | (Coin Meter B)
--------------------------------|---|---|----------------------------------
Coin Mech A | K | 9 | Coin Mech B
--------------------------------|---|---|----------------------------------
Reset | L | 10| Service Switch
--------------------------------|---|---|----------------------------------
P1 Start | M | 11| P2 Start
--------------------------------|---|---|----------------------------------
P1 Left | N | 12| P1 Right
--------------------------------|---|---|----------------------------------
P1 Up | P | 13| P1 Down
--------------------------------|---|---|----------------------------------
P1 Fire | R | 14| (P1 Spare)
--------------------------------|---|---|----------------------------------
(P2 Left) | S | 15| (P2 Right)
--------------------------------|---|---|----------------------------------
(P2 Up) | T | 16| (P2 Down)
--------------------------------|---|---|----------------------------------
(P2 Fire) | U | 17| (P2 Spare)
--------------------------------|---|---|----------------------------------
(Gnd) | V | 18| (Gnd)
--------------------------------|---|---|----------------------------------
R | W | 19| G
--------------------------------|---|---|----------------------------------
B | X | 20| Comp Sync *
--------------------------------|---|---|----------------------------------
(Gnd) | Y | 21| (Gnd)
--------------------------------|---|---|----------------------------------
(Gnd) | Z | 22| (Gnd)
---------------------------------------------------------------------------
* At the bottom center of the Sound II board, there is a section labeled
"Color Conv." At the far left you will see switch #4 (SW4). If this switch
is off ("0"), you will get JAMMA compatible negative composite sync. If it
is on ("1"), you will get positive composite sync.
Items in parantheses "()" are only needed for the cocktail setup, or perhaps
as extra pinouts.
Speaker @ 8 Ohms
There is an additional 10-pin connector between P1 on both boards. Pin 1
on the sound board maps to pin 1 on the video board, pin 2 on the sound
board maps to pin 2 on the video board, etc. A Zaxxon boardset should come
with the connector between these two sets of pins.
P1 connector on both boards:
Pin | Definition
------------------
1 | Unused
2 | +12V
3 | Unused
4 | Gnd
5 | Gnd
6 | Gnd
7 | -5V
8 | +5V
9 | +5V
10 | +5V
There is an additional 6-pin MTA connector at P4. I believe it is needed
to get sound.
P4 connector on Sound II Board
Pin | Definition
------------------
1 | Unused
2 | Unused
3 | Spkr + [to P5-7?]
4 | Spkr - [to P5-H?]
5 | Unused
6 | Unused
--Dave Holcomb
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