tech pacman bootleg problem

[John Bennett]

[ukvac] tech pacman bootleg problem
bootleg pacman GDP-01 pcb
it resets just before the rug test pattern (the white hollow squares) comes
up
any ideas

thanks in advance
Mark



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DATA Imported from archives: originally posted by Mark (markgwilliams@ntlworld.com)

 

[pobtastic]

RE: [ukvac] tech pacman bootleg problem
>it resets just before the rug test pattern

Yes, check the watchdog circuit... Hmmmm... If that looks okay I'd verify
the ROM's and check the sockets out. If your HALT signal is on (whatever
way that is, high or low I forget hell look it up) then you're in trouble...

Oh and try swapping those 2114's around if they're socketed and see if you
get a different error (hence meaning one is faulty).

Pobster



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[pobtastic]

RE: [ukvac] tech pacman bootleg problem
Okay HALT is active low I looked it up... And somewhere on that board is a
74LS259 first see if its hot... And if it is then change it, else if its
cool - check its I/O with a probe. Finally, if its anything like an
original check out the E-ROM's on the auxiliary board.

Pobster
PS. Sorry about the vagueness and ummm... 'quickness' of these emails I'm
going out!

 

[John Bennett]

[ukvac] Re: tech pacman bootleg problem
Are you running the Midway Pacman ROMs?
If so, try the Namco ROMs.

The Midway ROMs will not work not work on some bootleg
Pacman boards. There is an important difference between
the two sets of ROMs in the way the interrupts are
handled. I found this out one day and it was a nightmare
to track down.

Gary.



DATA Imported from archives: originally posted by (lists@ntlworld.com)

 

[John Bennett]

Re: [ukvac] Re: tech pacman bootleg problem



DATA Imported from archives: originally posted by Mark (markgwilliams@ntlworld.com)