IBM PC hacking

[Jim Leonard]

Michael B. Brutman wrote:
> 
> 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 
> mode required a lot less of the machine to be functional than the user 
> level diagnostics or the advanced diagnostics.

I have the hardware reference with all of the dongles, but I've never actually 
had a reason to use them (all my PCjrs still function).  But that is good to 
know, thanks.
-- 
Jim Leonard (trixter at oldskool.org)                    http://www.oldskool.org/
Want to help an ambitious games project?             http://www.mobygames.com/
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