"Bob Williams" <[EMAIL PROTECTED]> wrote:
> If I put a modern UART (extra i/o card with 16550) in an older machine
> like an XT - 4.7 MHz I think (?) - how fast should it be able to
> communicate? Should you be able to get the full 115.2K? 33.6?
I seem to recall that an XT would still be likely to have problems at higher
speeds. The UART included a 16 char buffer (if I'm remembering correctly)
that helped with over-runs, but the CPU still had to move stuff out of
buffers etc. Only testing will tell for sure, of course!
> [...] However, dialing in at slower speeds, even 14.4K, is
> both additional cost for me, and not really popular with my sysop.
What sort of modem do you have? Many can be set to connect to the remote at
a speed other than the speed it uses to talk to the PC. Typically, you'd set
the PC-modem speed up high, and that way the modems could negotiate a speed
and use compression features etc. to get the fastest available. In your
case, you might do the opposite. Set it so the modems talk at high speed
(you'd be looking at a 14.4Kbps or higher modem here of course) and the
modem-PC speed might stay lower. Again, I think you're going to have to
tinker a bit in any case. I always did, even with relatively "modern" PCs.
Good luck!
- Bob
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