28 Sep
2005
28 Sep
'05
4:49 p.m.
The problem with those diagnostics (and most
built-in diagnostics) is
that a fairly large part of the machine has to be operational (at
least the CPU, some memory, ROM, video) for them to be at all useful.
-tony
One of the lesser known features of the PCjr was the manufacturing test
mode. I think output was via the ports on the back. (Not the famous 'L' port though, which appears to have no
use.) The manufacturing test
According to the schematiocs, there are 5 pins on the L connector. 1 is
ground, the other 4 are not connected 'spares'.
-tony