9010A, Not sure what this means...

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