DEC field veterans: what's KA64A's self test #21?

From: Ethan Dicks <erd_6502_at_yahoo.com>
Date: Thu Mar 28 21:16:35 2002

--- "Carlini, Antonio" <Antonio.Carlini_at_riverstonenet.com> wrote:
> To verify (for sure) you should have
> the yellow LED off (self-test failed)
> and the red LEDs below that
> reading OFF, ON, OFF, OFF, OFF, OFF, ON
> (which is 21 in BCD - no, I don't know why!)

What doesn't make sense? Why it's seven lights for two BCD digits
or why that pattern equals 21? (010 0001) I would guess that there
aren't any codes higher than 79, so why install the highest bit.

-ethan


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Received on Thu Mar 28 2002 - 21:16:35 GMT

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