Re: Asteroids interesting symptoms

Watchdog reset turned off or not working?
On Sep 8, 2012 7:08 PM, "Douglas Gauck" <douglas@gauck.com> wrote:

> Here's one I'm sharing just because of how interesting it is. I have an
> -02 version of Asteroids that plays just fine except:
>
> 1. Locks up (blank screen) when switching into test mode, but will pass
> self-test when powered up in test mode.
> 2. Same lockup when switching out of test mode, but will play fine when
> powered up normally.
> 3. Plays as many single player games as you like, but if you play two
> player, at the end of the games it never flips the screen back from player
> two to normal nor does it allow you to start another (single or two player)
> game (but goes into attract and looks fine with P1 and P2 flashing).
>
> I'm planning on swapping the program ROMs and/or RAM, but if someone can
> think of a more clever culprit that would cause theses symptoms, then...
> well, they win respect and... appreciation. I've looked through the
> schematics and it's actually not too clear how the inverting circuit gets
> controlled by the program.
>
> -Douglas
>
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Received on Sat Sep 8 20:45:10 2012