Autobaud Modems

[Guy Harris]

> Some time ago there was a lot of debate about auto-baud modems
> and different ways to do them.  The solutions were all done totally
> in software.  This solution uses hardware to aid the software and
> the only problems with it is that it can only be used at two
> speeds.  Typically the speeds are 1200 and 300.
> 
> The concept is quite simple.  The ring detect line is not used for
> anything usefull (at least in the DH driver on a 4.2 system).  Most
> autobaud modems have a speed line availiable on the RS-232 connector.
> So it is simply a matter of connecting the speed line of the modem
> to the ring detect line of the DH.

If I remember correctly, there was stuff in V7 to do exactly that on
a DH (there was also stuff in V7 to adaptively set the silo alarm level
on DHes, and that wasn't in 4.xBSD either).

	Guy Harris
	{seismo,ihnp4,allegra}!rlgvax!guy