baud modifier

Tony Duell ard at p850ug1.demon.co.uk
Sun Mar 11 15:54:13 CDT 2007


> > Are there many computers (apart from the BBC Micro!) that can do 9600
> > baud but not 110 baud? I ask merely for information.
> 
> The Spare Time Gizmos SBC6120 (single board pdp8e clone) allows 38,400,
> 9600, 1200, and 300.  There's a permanent mod that adds 110, but I'm put
> off by the permanent part.  You also lose the 38,400 setting.

Does it support hardware flow control on the console port? If not, then 
you're going to have a problem if the machine is seding characters at, 
say, 1200 (about 120 cps) baud and your tty is only taking them at 110 
baud (about 10 cps, since 110 baud often implies 2 stop bits). You've 
got to have a way to tell the faster side to stop sending for a bit.

What does the mod consist of? I can't believe it's really permanent 
(although it might well involve soldering to undo it). Losing 38400 buad 
is surely not a problem, since few, if any, classic terminals ran at that 
speed, and you don't _need_ that sort of data rate for a tectual terminal 
anyway.

-tony



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