Galaga pinout
44-pin card-edge, Bootleg Galaga board
| Marked as follows |
| Board | Label |
| CPU | MGG-703A |
| VIDEO | MGG-703B |
This two board stack is very large, the boards are approx 10 1/2"
wide x 16" long. The CPU board has 4 Z80's and 7 2732s. The sound amp is an MB3712
and is located in the top left corner if you have the board oriented with the card-edge
pointing up. On the right side of the board, there is a 50 pin ribbon cable and one on
the bottom in the center. The video board is almost the same size as the CPU board, just
1/4" shorter. The Video board has the normal 6 2114 rams and space for either
2 2148 RAMs, or 8 2147 RAMs.
| Parts Side | | | Solder Side |
|
|
|
|
| GND |
A |
1 |
GND |
| Speaker + |
B |
2 |
Speaker - |
| Lockout Solenoid |
C |
3 |
Coin Counter 1 |
| P1 Start Lamp |
D |
4 |
P2 Start Lamp |
| +12 VDC |
E |
5 |
+12 VDC |
| +5 VDC |
F |
6 |
+5 VDC |
| GND |
H |
7 |
GND |
| Service |
J |
8 |
Test |
| Coin 1 |
K |
9 |
Coin 2 |
| P1 Start |
L |
10 |
P2 Start |
| P1 Fire/Jump |
M |
11 |
P2 Fire/Jump |
| P1 Left |
N |
12 |
P2 Left |
|
P |
13 |
|
| P1 Right |
R |
14 |
P2 Right |
|
S |
15 |
|
|
T |
16 |
|
|
U |
17 |
|
| Video Green |
V |
18 |
Video Blue |
| Video Red |
W |
19 |
Composite sync |
|
X |
20 |
|
| Coin Counter 2 |
Y |
21 |
Table1 |
| GND |
Z |
22 |
GND |
1 Ground this pin for Cocktail mode
The most notable thing about this bootleg is that it has the same pinouts
as a Midway Galaga board, but no 3-pin power connector on the CPU (But there is space for it
if you wanted to populate it) and the monitor connections are on the card-edge instead of a
separate 6-pin video connector on the Video board.
There are two banks of 8 switch dip-switches and they have the same settings
as a normal Midway Galaga board.
|
