Re: Fluke & Dynamic Ram test?

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Found some of it: http://members.cox.net/seanriddle/willy.html
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The classic Williams games cram 48k RAM, 48k ROM and 4k I/O into the 6809's
64k address space using bank-switching.

$0000 - 8fff is bank-switchable between RAM and ROM. Writes always go to RAM.
$9000 - bfff is always RAM.
$c000 - cbff is I/O $cc00 - cfff is CMOS RAM;
$cc00-ccff is write-protected when coin door shut.
$d000 - ffff is always ROM *
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Now where was the toggle bit to enable set the bank for the RAM? That is
there somewhere...as I say it's at the shop with my schematics etc...sorry...

John :-#)#

At 01:32 PM 10/11/2002 -0500, Kev wrote:

>Well my biggest problem is the Williams video boards of the early 80s. If
>you put the 9100 in auto RAM test mode this will fail because (I'm guessing
>here) that it isn't properly writing & reading from the 2nd page of the RAM
>& higher.
>
>If you manual do 2 writes & 2 reads it works fine but the auto test cann't
>handle it.
>
>There is a big write up in the 9100 Application manual specifically on
>handling Dynamic RAMs but I figured I'd solict for a bit of insight first.
>
>Thanks,
>Kev
>
>
>
> >I don't see how testing dynamic would be any different than testing static,
> >both look the same to the CPU....if you want to test the individual ICs
> >then you need to pick up a BugTrap Dynamic Ram tester...or similar that
> >will check the old timers.
> >
> >You can replace dynamic with static if you are so inclined with just
> >getting the addressing and select sorted out. Static ram is much faster now
> >than it was back in the 70/80's and can easily do the job.
> >
> >Or do I not understand the problem you are proposing?
> >
> >John :-#)#
> >
> >At 09:08 AM 10/11/2002 -0500, Kev wrote:
> >
> >
> >>Has anyone built any programs to do Dynamic Ram test for either the 9010
>or
> >>9100?
> >>
> >>I'm looking for something that would cover 4116 &/or 4164s.
> >>
> >>Thanks,
> >>Kev
> >

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Received on Sun Nov 10 11:54:10 2002