An easy way to test most game boards is to identify the +5VDC
and provide power there, then get your RGB monitor connected to the same
ground and run one of the colour inputs along each of the other pins untill
you see either image or a faint square box (sync line tie point). If only
the ground and +5VDC are hooked up there is no possibility of damage to the
monitor (unless you snap off the neck!), next identify which colour goes
where by trying for realistic background and white score/information.
Next you have to figure out the coin and start lines, use a jumper wire
connect to game ground and run it over all the unused lines untill you see
credit appear on screen, usually two inputs for coin, next when you have
credit identify player 1/2 same way, controls & buttons too. For audio
there is normally a +12VDC input, for this be careful, you MUST find the 
line that goes to the +12VDC input on the audio amp IC (usually the first
or last pin on the package), if any doubt get a reference book (ECG is
handy) to be sure. Lastly you might need -5VDC for audio and in some
cases +12VDC and -5VDC for the RAM memory power. If game won't power up
with +5VDC alone, identify the RAM chips (ECG) to see if you need triple
supply for RAM. Sigh, that is a little trickier. BUT Commando is only +5VDC
for logic and I think +12VDC for audio. Check Wiretape for pinouts.....
:-#)>
--  
jrr@flippers.com  <--- NEW E-Mail address, soon to be a nice little web page...
(jrr@jukes.wimsey.com   <---Old address, still good, not so fancy!)

John's Jukes Ltd. 2343 Main St.|  Voice (604)872-5757 FAX 872-2010   
Vancouver, BC, Canada V5T 3C9  |  (Pinballs, Jukes, Video Games)      
               ^^^^^^ 
    "Old pinballers never die, they just flip out."