colbert@unc.UUCP (Darylene Colbert) (01/15/85)
I have written an interrupt driven communications program that works fine
on the XT but fails under certain conditions on the AT. These conditions are:
1. High volume of transmission & received data at high baud rates
(4800 or 9600 baud)
2. Any kind of receiver error (such as a parity error).
I use all four possible communications interrupts (receive data available,
transmit buffer empty, line status, and modem status). I have tested a few
other programs that are similar to mine and they all failed on the AT except
one that used only the receive data interrupt. One that failed is a program
from IBM!
I tried putting delays after every I/O port access; but the longer I made the delays, the more pronounced the problem became! The symptom is an apparent
shutdown of the RS232 interrupt system. After the screwup, I never get a
communications interrupt again.
I am at the end of my rope. Can anyone give me a clue?
Thanks
Edmund Burnette