Re: GRAN TANK 10 piggy back

"Cassidy" wrote:
>How funny....
[snip]
>Can someone take a look at the schematics and see if its possible to
>run a GT board completely off of a switching power supply? I am not
>sure my voltages are right (and after I had an electrolytic blow up on
>the board, I am scared to damage something else).

It is possible, don't know if its advisable for extended periods, i run
the pcbs on my rig on a standard jamma supply, i cheattho, and use the
+5v output pad to put +5v IN to the board.. works ok, but the whole pcb
will be drawing +5v through that one pad, so you might want to add croc
clips onto other points to help the +5v propogation, i can see the pad
burning up if you have the machine switched on for ages.

I hook +12v to the +18v point, -5v to the -5v point, and -5v to the -12v
point, it does work on the rig, but i can't say that for long periods
that it'd be happy with just -5v on the -12v rail.

They're dead simple regulator circuits, just fix it :)

>BTW, I have two of thse boards, and both have all the roms. I also
>have an eprom burner, so I could try dumping both sets (one for Trak
>and one for GT). I just need to know what I am dumping them as
>(example 2532 or 2732). If someone lets me know that, I will try
>dumping them for you guys.

Thanks for the offer, but we all have burners, the prom on this pcb is
particulary ancient, and even though i have an ancient Data i/o 29b that
does everythign else under the sun, i can't find the device in the
software, it is a 74186 for your reference :) the schems say it is a
16,384*8 prom, but various references on the net say its 64*8... i dunno
:)

Andy Welburn
www.andys-arcade.com




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