POST Cards (Was: PDP-11/44 boot prompt

From: Fred Cisin <cisin_at_xenosoft.com>
Date: Tue Nov 3 11:49:32 1998

On Mon, 2 Nov 1998, Tony Duell wrote:
> [POST cards]
> . . .
> I don't find it that useful, actually. I have used it on this PC when I
> had a little processor problem, but for most faults a logic probe is a
> lot more use.

Another use, for those who indulge in programming: When you want to know
what's going on, or just want confirmation that the program reached a
certain milestone, what could be simpler than OUTing AL to a port? Small
enough so as not to push very many short jumps out of range, and if you
don't bother to remove THAT debugging code before shipping, nobody
complains.
 
--
Fred Cisin                      cisin_at_xenosoft.com
XenoSoft                        http://www.xenosoft.com
2210 Sixth St.                  (510) 644-9366
Berkeley, CA 94710-2219
Received on Tue Nov 03 1998 - 11:49:32 GMT

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