cclist at sydex.com
Fri Dec 30 16:08:50 CST 2005
On 12/30/2005 at 1:23 AM Richard wrote:
>Which reminds me of an interesting story. These modems were only
>rated for 1200 baud. We used them at that speed for several weeks
>before I said "why not just turn up the baud rate and see what
>happens?" -- one of those questions young teenagers ask because they
>don't know any better :-). So we tried 2400 baud. Garbage. We then
>tried 1800 baud and they worked flawlessly. Sweet! 50% bonus just
>for being experimental!
I remember doing exactly the same thing--those Racal-Vadic modems didn't
seem to be too sensitive to data rate. I recall using one at 2000 baud
with no problems, even though I couldn't get 2400 to work at all.
Anyone remember the old Bell 103 modems? IIRC, the design was something
like a big pile of passives and only a couple of transistors. But then,
300 baud was as good as they got. WE was pretty good at designing circuits
that used the minimum of active components; IIRC, the DTMF touch-tone
dialing circuit was a single transistor.
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