pdp-8/e restoration.

Noel Chiappa jnc at mercury.lcs.mit.edu
Wed Aug 9 16:50:43 CDT 2017


    > From: Philipp Hachtmann

    > The DEC stuff was designed quite wrong-insertion resistant.
    > ...
    > I did it. Once. It leads to impressive fireworks on many boards.

I managed to plug in an M9301 backwards, once. Luckily, most of the other
boards came through OK (I think I lost one chip on the CPU), but on the
M9301, I fried over half a dozen chips.

Just goes to show, they _try_ and make it hard to put them in wrong, but it's
still possible! :-)

Later on, they got smart - they gave up trying to prevent smart fools ('you
can't make anything fool-prof because...') like me from doing it, and instead
made it harmless to do - on the QBUS, many boards can take being plugged in
wrong, with no ill effects. I think I did that at least once, there.

	Noel


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