🚀 go-pugleaf

In article <q2aDPB1w164w@buscard.fidonet.org> sharky@buscard.fidonet.org (Gary Sciacca) writes:
>Anyone know why I would modem problems with windows and
>not in DOS. I have 2 com ports and 1 internal modem at
>com 3. The mouse is working fine as com 2 in windows
>but I'm having flacky probs with and windows application
>that uses a modem. Hangs system, with faults, download 
>problems. If I use the internal modem with Procomm
>under DOS 5.0 only, everthing works fine. Do I have some

Ah, the classic question every windows user with a fast (>2400)
modem asks, sooner or later. The problem is that when a character
comes in the serial port, it signals with an IRQ that the computer
should copy the received character into memory. This has to happen
immediately because the UART (8250 or 16450) has room for one character
only. With windows running, there is so much activity going on that
the CPU can't serve the serial port fast enough. This of course
results in losing incoming charaters.

Solution: replace your serial port UART with a 16550. This has a 16 byte
buffer, so that the serial port can hold 16 characters before starting
to lose data. This has solved all my friend's problems similar to yours.

How to find out what UART you have? There must be several programs
that can report this. The one I know of is Port Finder v2.7
You can get it via FTP from SIMTEL20 from msdos' sysutl directory
named  pf270.zip.
European users: nic.funet.fi /pub/msdos/utilities/sysutl/pf270.zip



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