24 Oct
2001
24 Oct
'01
6:19 p.m.
I've never been happy with the digital one-shots. The analog ones start more or
less right away, but end when they time out, and that depends on component
variation and system power supply noise. The digital ones start when they're
good and ready and end a precise amount of time later. Until we get everything
to run from femtosecond clocks, presuming that a femtosecond will be
insignificant, and don't mind that the desired delay requires 100 bit-long
ripple counters, there'll always be the debate. Now that passives cost more
than registers, it will probably favor the digital types, though.
Dick
----- Original Message -----
From: "ajp166" <ajp166(a)bellatlantic.net>
To: <classiccmp(a)classiccmp.org>
Sent: Wednesday, October 24, 2001 7:34 PM
Subject: Re: What people "should" know
Here here! One-shots are fine for pule shortening or
stretching
so long as it's non-critical.
Worst abuse, Altair 8800 front pannel.
and maybe the second-worst is the ALTAIR CPU.
One of the best designs that use a oneshot was the PERCOM
Cassette board, it was a digitial oneshot and predictable.
If its period was predictable, how did one predict when it started?
Allison
-----Original Message-----
From: Richard Erlacher <edick(a)idcomm.com>
To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org>
Date: Wednesday, October 24, 2001 9:12 PM
Subject: Re: What people "should" know
That's why it's been common practice to
fire anyone who uses one-shots
(monostables) for anything. I personally believe it should go beyond
that, in
that the perpetartor of such a heinous crim should
be barred from
asserting his
credentials as a circuit designer for a short
period, of, say, 10
decades.