Re: Tempest resetting problem

Are the beeps in test mode from checking the ram? I think most of the
atari vectors will start beeping when it detects a bad ram. Depending
on the tones, it shows which ram it determined were bad. You can get
the table from the owners manual. Also, have you checked the power
supply? The big blue can cause weird problems like this.

Jon

At 01:08 AM 10/18/99 -0700, you wrote:
>I've been trying to fix a tempest board, but I can't seem to figure out
>what the problem is. When I power the game up is just keeps beeping and
>the 1&2 player lights just blink. When I put the game in test mode it
>does the same and then when I ground the WDDIS is doesn't beep is just
>sustains a long tone. Obviously a restting problem.
>
>The roms are good and the Mathbox board is good. The clock is ciruitry is
>good (Feedback loops seem to look good on the scope). All the voltages
>check out fine.
>
>The two things I'm suspect of are 1) The watchdog circuit: even though the
>circuit looks fine on the scope, I can't help but think the problem lies
>in this circuit
>
>2) I'm not so sure of the ram. My fluke 9010a can't do a read/Write to
>anything in the ram address space (both program ram and color vector ram)
>- so either one of the buffers is bad or a ram chip is bad.
>
>Perhaps someone could give me ideas? Sometimes I have a tendancy to
>overlook obvious things.
>
>
>Thanks...
>
>
>Matt
>
>
>
Received on Mon Oct 18 07:02:48 1999