Understanding DECsystem 5100 Self Test Failure

emanuel stiebler emu at e-bbes.com
Sun Jan 4 14:04:24 CST 2015

On 2015-01-04 12:46, Robert Jarratt wrote:
> When I power up my DECsystem 5100 I get the output shown at the end of this
> email. I thought this was to do with the DS1287 chip as it seems be an NVRAM
> battery error (perhaps). Since I know these devices fail I took out the
> DS1287, put in a socket and then bought a replacement DS12887A. But I still
> get the same problem. It could be that I bought a bad replacement, or that I
> have done some damage in my desoldering of the original, or it could be that
> the error is something completely different. In fact the Maintenance Manual
> suggests test 9 is to do with the DZ, and I can't find what test 4 relates
> to.

test 4 is RTC test

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