> I made a comment to this effect on the list once and I was told that I
> was incorrect. The Baycom used the UART for serial to parallel conversion
> the other person stated I assumed that this person actually read the
> manual, and knew what he was talking about.
I haven't used Baycom for a long time. I know the same people who
developed the CPU-intensive modem-only approach also developed an add-in
PC interface which I assume has somewhat more hardware than just a simple
modem chip. I think they were mostly used in Europe. I have never used
one, nor even seen one. But when people talk about Baycom they may be
talking about one of several systems.
> I just looked up the data sheet on the 16550 and as you say it DOES NOT
> support synchronous communication. The driver just use the UART as an IO
> port.
Yes, that is what it does. In fact, an alternative approach is to use the
printer port. This approach was taken by PMP (Poor Man's Packet), a
somewhat simpler CPU-intensive packet system. In fact, plans were
published for modems that you could reconfigure (by soldering jumpers) for
using either the printer port or the serial port. Either way it is just
serving as a parallel port.
73, Al N1AW
+----------------------------------+
| Albert S. Woodhull |
| Hampshire College, Amherst, MA |
| wcn.fejn@rcahms.gov.uk |
| http://minix1.hampshire.edu/asw/ |
+----------------------------------+