RE: 9010A, Not sure what this means...

Thanks. This is very helpful...

JB

--James Bright
www.QuarterArcade.com
Restored Arcade Games for your Home

> -----Original Message-----
> From: Mark Shostak (DOS) [mailto:shostak@augustmail.com]
> Sent: Saturday, April 19, 2003 7:27 PM
> To: James S. Bright; techtoolslist@flippers.com
> Subject: Re: 9010A, Not sure what this means...
>
>
> If I read your question correctly,
>
> It's complaining about an address decoding error,
> specifically with bit A0. So, it found that when it wrote a
> value to an address, then changed bit A0, the value it wrote
> to the previous address appeared at this other address.
>
> Try your manual test again:
> write 55 to 0 (and read back)
> write AA to 1 (and read back)
> read 0 again and see if it's 55 or AA
> also try it the other way (if writes to loc 0 appear at loc 1)
>
> That's the basic idea. Bit 0 is about the easiest one you
> could have hoped for to learn on. Hope that helps.
>
> -Mark
>
>
> >
> >
> > Working on a Centipede (6502 based).
> >
> > RAM test (Short or Long) on RAM that I think is good, I get
> "RAM DCD
> > ERR @ 0000 BIT 0". I'm not sure what this means. I've tested the
> > buffer chips (data and address) and they appear to be okay.
> When I run
> > custom tests (reading and writing AA/55), the RAM seems okay. Can
> > anyone elaborate on this error message? The manual didn't
> really help
> > out. I'm not exactly sure what to do next with this board.
> >
> > (This board doesn't play blind, and nothing appears on monitor.)
> >
> > TIA.
> >
> > JB
> >
> > --James Bright
> > www.QuarterArcade.com
> > Restored Arcade Games for your Home
> >
> >
> >
>
>
>
Received on Sat Apr 19 19:05:08 2003