Document Title: [Galaga_boot22.txt (text file)]
G A L A G A
=============
by Brian Murray
(brian@demon.csd.unsw.edu.au)
There are apparently many different galaga implementations, this one
happens to be mine. I don't know how I would identify my particular
boards, but I'll give as much as I can. (They were from a tabletop
if that matters). There are two boards, both with blue solder masks.
The top one (slightly larger) is the CPU board, has the 4 processors
and program EPROMS, and holds a small credit-card sized daughter
board that plugs into a 28-pin DIP socket near the EPROMS. It also has
'DG-09-2' silk-screened in one corner near the main connector. The bottom
board is the video board. It has a small 5 pin connector in one corner
for the video output signal, wired as follows :
(closest to corner of board) 1 - Red
2 - Blue
3 - Green
4 - Sync
5 - Video GND
Main connector:
PARTS SIDE | SOLDER SIDE
GND | A | 1 | GND
GND | B | 2 | GND
+5V | C | 3 | +5V
+5V | D | 4 | +5V
| E | 5 |
| F | 6 | GND for Cocktail
Player 1 RIGHT SW | H | 7 | Player 2 RIGHT SW
Player 1 LEFT SW | J | 8 | Player 2 LEFT SW
Player 1 FIRE SW | K | 9 | Player 2 FIRE SW
Player 1 START SW | L | 10| Player 2 START SW
| M | 11| Coin SW
| N | 12| Test/Setup Mode SW
Video Red (see above) | P | 13|
Video Green (see above) | R | 14|
Video Blue (see above) | S | 15|
Video Sync (see above) | T | 16|
| U | 17| Speaker
+12V | V | 18| +12V
+5V | W | 19| +5V
+5V | X | 20| +5V
GND | Y | 21| GND
GND | Z | 22| GND
}
