+---------------------------------------------------------------------------. Title : Midway Space Invaders To JAMMA : Version : 1.0 : Date : 19-January-2004 : Author : Wayne Whitney : +---------------------------------------------------------------------------. : : +--------. : Credits \ : +----------`----------------------------------------------------------------. : Special thanks to John Robertson of John's Jukes in Vancouver Canada. John : is very knowledgable and has bailed me out on a number of conversions. : Thanks also to Dick Millikan for sharing his knowledge. : : +-------------. : Instructions \ : +---------------`-----------------------------------------------------------. : This is a conversion I've wanted to do for some time now. What stopped me : was finding out that this game doesn't use a standard RGB monitor. In the : dedicated cab it uses a monochrome composite monitor. This isn't too much : of a problem for testing boards, since old Apple composite monitors aren't : that hard to get. It does present a problem for running the boardset in a : JAMMA cab. As it turns out, there's a way around this. The composite : video output of the board is actually a combination of a video signal and : a sync signal that get combined on the mother board. Midway was kind enough : to run these 2 signals through 2 resistors that are an inch from the edge : connector, making them easy to connect to! I'll describe these connections : in more detail after the standard JAMMA connections. : : I've included the pinout from Wiretap with some additional notes. The : connections marked "NC" were pins I didn't connect. It ran fine for me : this way, but if you want to connect them, go right ahead! What is referred : to as the 18 pin connector (actually a 36 pin) is the edge connector of : the mother board. Pins 17 & 18 are the output to a composite monitor. : If you choose to connect one of these, the plug used is usually : an RCA style connector. Pin 17 goes to the outer ring (gnd), and pin 18 : connects to the center pin (signal). The rest are simply power connections : from your JAMMA connector. The 16 pin connector is the set of pins in the : upper-left corner of the game logic board. Pin #3 connects to JAMMA coin1. : Pins 8&9 are speaker outputs. Pin #11 connects to JAMMA +12v. Pin #6 is : a reset line. This one needs to be connected to one lead of a 1K resistor : and the other lead connected to JAMMA ground. The 13 pin connector is : located in the upper right corner of the game logic board. Pins 2,3,6 & 7 : are connected to the appropriate JAMMA pins for upright cabs. The rest are : for player #2 in cocktail setups. : : : +----------------------. : Space Invaders Pinout \ : +------------------------`--------------------------------------------------. : : 18 PIN CONN 16 PIN CONN 13 PIN CONN : 1 +5V 1 1 GND : 2 +5V 2 COIN SW (NC) 2 1 RIGHT : 3 +12V 3 COIN SW 3 1 LEFT : 4 +12V 4 GND 4 : 5 -5V 5 CTR (NC) 5 KEY : 6 6 RESET (SEE NOTES) 6 1 FIRE : 7 7 7 1 START : 8 8 SPEAKER 8 2 START : 9 9 SPEAKER 9 : 10 10 AUDIO VOLTAGE RETURN 10 2 FIRE : 11 11 AUDIO VOLTAGE (+12V) 11 2 LEFT : 12 12 O-B TO MONITOR (NC) 12 2 RIGHT : 13 13 GND 13 : 14 GND (- SENSE)(NC) 14 : 15 GND 15 : 16 16 : 17 Composite (Gnd) : 18 Composite (Signal) : : : +-----------------------. : JAMMA Video Connection \ : +-------------------------`-------------------------------------------------. : If you choose to run this board in a JAMMA setup with a standard low res : monitor, you will have to make a couple of extra connections. There are : many variations of the SI mother board, so you may have to do a little : snooping to get this to work. If you follow the trace from pin #18 on the : mother board edge connector you will run into a capacitor. Further on, you : should run into 2 - 1k resistors that are within an inch of the edge of : the board and right next to each other. On some boards these are : perpendicular to the front edge of the board, and on others they are : parallel to the front edge. This is where the sync and video combine. You : need to connect wires to the end of each resistor on the end facing away : from the edge connector. In other words, you need to pick up the signals : BEFORE they pass through the resistors. If you wanted to permanently : modify the board, you could simply solder wires to these points and then : connect them to 2 unused contacts on the edge connector. Not wanting to : alter the board, I simply used 2 mini test clips to connect the resistor : leads directly to my JAMMA adapter. These 2 connections are sync and video, : so one will go to the JAMMA sync pin, and the other will go to one of the : JAMMA video connections. I chose the Video Green pin, but you could use : Red or Blue if you prefer. Because of the different board revisions, it's : difficult to describe which is which. You have a 50-50 chance of getting it : right the first time. If it's wrong the first time, just reverse them! The : only other thing to do is make sure you run a ground wire to the JAMMA : Video ground pin on your adaptor. : : +---------------------------------------------------------------------------: