M8192 KDJ11-A ZKDJB2 XXDP Test Failure

Noel Chiappa jnc at mercury.lcs.mit.edu
Mon Sep 14 13:37:45 CDT 2015

    > From: Holm Tiffe

    >  "Ensure that halt trap option is disabled (jumper W9 installed)."

Well, either that was transcribed incorrectly, or the person who wrote it
confused. On the M8192, per EK-KDJ1A-UG-002, pg. 2-1, W_5_ is the halt trap
option, and W9 is... BEVENT recognition. One removes W9 to enable the LTC
(using the QBUS BEVNT line).

Which kind of explains your results... :-)


PS: BTW, the M8190 (KDJ11-B) in similar - the onboard ROM diagostics barf if
the LTC isn't on (i.e. the switch on the chassis to enable BEVNT has to be

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