Pcb pinout help

[ben76]

Hi guys,
Got this pcb from Alex at play expo yesterday and I'm trying to suss what pinout it uses?



Any ideas

TIA

- Ben

 

[Eddhorse]

This was the first arcade game i played. Wow.

 

[Purity]

It looks *similar* to the subelectro board that smarty fixed up:

http://www.ukvac.com/forum/subelectro-hunch-back-pcb-repair_topic342906.html

 

[big10p]

You're too late, Ben - we've already played that in the hi score comp.

Nice get, though.

 

[guddler]

It's not subelectro pinout. Subelectro 'galaxian hardware' pinout is an oddball number of pins. 2x24 I think so you have to use a 2x28 jamma edge connector and cut it off.

[EDIT] Actually, scrub the rest of that - it's Galaxian pinout. Double check first of course using bing or google image search but it looks like std galaxian to me.

guddler2015-10-11 12:53:50

 

[ben76]

Cheers

Hopefully can sort an adapter later and test it

- Ben

 

[favouredson]

I agree with Guddler, it looks like a standard Galaxian bootleg.
Subelectro did indeed use a 2x24 pin connector.
(I have a few of them.)

 

[Purity]

Thanks for clarrifying this guys. Subelectro was merely a guess

 

[Nes4life]

Not to diverge this topic too far but... if you had a prototype board, or something completely undocumented, how would you go about finding out where to apply 5v or 12v? Finding GND is easy enough. What significant features would you look for? I know 12v usually powers the audio sections of a board but what components would give it away?

 

[obcd]

5V shouldn't be that difficult. Pretty much all standard TTL 74xx chips have 5V and GND on well known documented pin's. For 12V, you indeed might check the audio amplifier supply pin. Some older boards also need -5V. It's specially older dram chips like the 4116 that need those voltage levels. Some older rom chips might need it as well.

 

[ben76]

As above about tracing stuff

Anyway after another look at the pcb it did have the DC Galaxian 1 wire conversion underneath. So I went for it and it went pop, something on the top daughter board. The game however does run but is unplayable. there is no sound the controls don't work but the game does run. So it maybe either fecked due to the time not being used, fecked anyway, it does however run... I don't have more time atm to look at it so it will have to go in the repair pile. I would like to again thank everyone for their help in identifying the pinout

- Ben