If the -28V is not there, test the 555 timer. I've had
problems with those (and the EAROM).
Potential issues:
1) EAROM bad?
2) -28V not here?
3) 555 timer not working?
4) socket for EAROM - bad connectivity?
5) broken parts around the 555 timer (caps, resistors, diodes etc)?
Also check www.deja.com and the vector archives
http://www.arlo.net/vectorlist/
for more possible leads on how to fix this problem and/or others. This has
been
covered on lots of games using this Atari HS scheme.
SPW
kanata, on
canada
-----Original Message-----
From: ]
Sent: Friday, January 05, 2001 4:36 PM
To:
Subject: Re: VECTOR: Asteroids Deluxe PCB - won't save high scores
The schematic is on the bottom right of
http://www.spies.com/arcade/schematics/atari/AstDlx1B.TIFF
My guesses would be that your EAROM is dead (they didn't have very many
write cycles) or that the circuit to generate the -30 no longer works
(replace the caps?).
HI!
I've got another question I wanted to ask. My AD board won't save the top
3 high scores. What is the fix ? Where and what chip is responsible? Is
it a battery-backed up SRAM or something ?
Thanks again !
Steve
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