On 2020/03/25 10:42 a.m., LexingtonVAPin wrote:
On 3/13/20 2:06 PM, John Robertson wrote:
On 2020/03/13 8:51 a.m., LexingtonVAPin wrote:
I picked up a HS2 - Getaway. Was told it loses memory.
I removed the AA holder and installed a watch battery holder. I did >>>> not notice any battery leakage damage.
I also re-seated the EPROM. We saw a program error at one point a
couple of months ago. Everything was fine for about two weeks.
I started up the game yesterday and got a factory reset note, so the
watch battery did not solve the problem. But when I reset it to
free play, I noticed that the date/time was accurate and not lost.
All the other settings (free play, high scores, other presetting,
etc.) appear to be lost.
If the clock settings are retained (that means the ASIC chip has
battery power) then I would be checking if the CMOS RAM had voltage
on pin 24 (28) that is at least 3VDC when the game is turned off. I
suspect the problem is either the CMOS RAM is defective (not too
likely as the game wouldn't boot normally) or a batter power issue
that is only to the CMOS RAM.
After thinking I solved this problem, two weeks later, the pin starts
up with a factory setting notice again.
It did this two starts in a row. At one point, it did not even retain
settings after backing out of the service menu. Then it worked.
Now, today, I start up and get a checksum error. Last time that
happened, re-seating the EPROM made the problem go away.
As before, date and time are saved, meaning the ASIC is OK.
Is my checksum error related to the RAM? Or am I potentially having
an issue with the EPROM socket or the EPROM itself?
My recollection is that when I upgrade EPROMs in WPC pins, the factory
settings are restored, even if power is left to the RAM. That tells
me that the issue might be with the EPROM / socket?
What is the voltage at the CMOS RAM pin 28 with the game turned off for
a while? If below around 2.25VDC then the CMOS RAM may not retain
settings and you will get that error...
And, yes when you upgrade the EPROM the game will give you the Factory Settings error, but if it was not seated the game wouldn't boot!
Any battery corrosion (or history) on your board? I'd be checking traces carefully...
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