Re: omega race hig score save

no scope..
I checked pin 17 and it is 4.97v. Using a logic probe, it lit up solid on every pin solid except pin 8 (gnd).
Currently I have replaced PN2, P4, PR1, S6, RP4. I also swapped out S7 with one from another board. The diodes, transistors and resistors all check out in the section you mentioned. I replaced all .01uf 50v caps in that line to the 5101 (4 of them).. but no change. Is the chip read by this same stuff? Maybe its there and not being read? Is JK6 part of the read/write?

--- On Sat, 11/1/08, William Boucher <boucher@mnsi.net> wrote:

> From: William Boucher <boucher@mnsi.net>
> Subject: Re: VECTOR: omega race hig score save
> To: vectorlist@vectorlist.org
> Date: Saturday, November 1, 2008, 11:28 AM
> If you have a scope available, you should try to capture the
> levels at pin 19 and at pin 18 when (or if) a pulse occurs
> at pin 20. That would prove whether or not the control
> signals were present and behaving properly.
>
> If you don't have a scope, and since you've likely
> eliminated most of the possible logic related problems, I
> think that it is likely that you have a discrete component
> problem.
>
> Measure the voltage at pin 17 of 5101. It must be a logic
> high while the game is on. This level provides an
> active-high chip select. Without it, the chip does nothing
> at all. This signal is provided by all that discrete
> component stuff next to the 5101 in the schematic. The
> zener D108, Q102 and Q103, R143 (and several other
> res's).
>
> When the game powers up, it'll read the 5101 only once
> and then display the results. When you get a new high
> score, it'll try to save the value once but it'll
> probably continue to display the correct value as long as
> power is not lost. If the 5101 isn't working, you
> wouldn't know it at that point.
>
>

      
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Received on Sun Nov 2 19:02:49 2008