Nor are many systems as easy to disable as Atari. On Pac Man Midway instructs you cut a trace or a pin to do it manually. Gorf is a similar example of what James B is refering to, it has a latch to select a section of RAM. That latch is also tied to the /RESET so you can test everything else fine by ignoring the /Resetting of the UUT but not that section of RAM. Kev <james@quarterarcade.com> wrote.
You can't always disable the reset or watchdog in software. You can ignore the reset line, but sometimes the watchdog can mess up your standard tests. (I *think* Centipede is an example of this... Been a while since I tried it.) I used to just ignore the status line via software, but nowadays I always ground the watchdog disable.
JB
--James Bright www.QuarterArcade.com Restored Arcade Games for your Home
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