On 2012-07-03 20:52, Shoppa, Tim wrote:
> Baud rate changes were used a lot. Atleast on DEC systems.
For the multiplexer style serial interfaces, yes. But just thinking
about VAX-11 and PDP-11... for system consoles (the equivalent of what
you get in the VAX or PDP-11 simh emulator) the baud rate was either set
with wire-wrap (DL11 or DLV11J type boards), with dipswitches (third
part DL11 emulating boards), a little knob at the console port, or in at
least one non-DEC 11 compatible, in nonvolatile configuration RAM.
Pretty much "fixed baud" for the console.
I have no doubt someone will put DLV11J style wire wrap terminals on a
little panel and wire it up to a patched version of SIMH to allow
console baud rates to change on the fly :-)
Right. Which is why my initial response only dealt with the console,
which I said is simpler in many systems, and you can get away with
less... :-)
Consoles in most cases also do not have modem control. Or just a limited
subset of the signals.
Johnny
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