Explanation of Diagnostic Lights on 3b2/400
Stephen Friedl
friedl at mtndew.Tustin.CA.US
Tue Nov 20 02:37:17 AEST 1990
In article <1990Nov17.040047.21053 at ox.com>, jih at ox.com (John Hritz) writes:
>
> I have a 3b2/400 that has crashed. Upon cold start, the power comes
> up and the diagnostic light blinks 5 times, pauses briefly and then
> repeats. The system never checks the floppy, so it is not possible
> to use the boot disk. Any info on what this diagnostic light
> sequence means would be helpful.
The diagnostic light will flash depending on the low-level error:
amber light description
----------- ------------------
1 flash unknown problem
2 flashes problem with CPU
3 flashes problem with ROM
4 flashes problem with RAM
5 flashes problem with DUART
The DUART is the dual serial chip running console and contty, and
it probably means that you have a bad cable or terminal.
Steve
--
Stephen J. Friedl, KA8CMY / 3B2-kind-of-guy / Tustin, CA / 3B2-kind-of-guy
+1 714 544 6561 / friedl at mtndew.Tustin.CA.US / {uunet,attmail}!mtndew!friedl
"Gcc compiles an interesting language which is not ANSI C." - Henry Spencer
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