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

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RAM DCD means RAM ADDRESS DECODE. Thus the external addressing or internal
decoding of the RAM is defective. Try using the WALK test for putting data
in the RAM (I think it's that one) that will sequentially increment the
data bit one byte at a time. Then do a read of that...

John :-#)#

At 05:44 PM 19/04/2003 -0400, James S. Bright wrote:

>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

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Received on Sat Apr 19 19:05:08 2003