Backwards MuP21 chip

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On Mon, 28 Jul 1997, Andrew Sieber wrote:

> Can anyone please verify that the notch and dot are correct, and the
> label is indeed upside down? Otherwise, I could really kick myself.

This is indeed the case -- the notch and dot are OK and are what you
should be looking at.

The test is fairly simple -- take a free floating P21, apply Vcc and Vss
to the respective pins with two clamps, ana monitor the activity on the
ROM and An pins with a third.

--
Penio Penev <Penev@pisa.Rockefeller.edu> 1-212-327-7423

.