metcalf@ucbmiro.ARPA (Chris Metcalf) (06/05/85)
I'm trying to write a machine-language modem-handler. Right now, I have a machine-language routine to emulate the H19 screen control codes, but I'd like to see the actual modem i/o written in machine language as well. The BIOS modem routines don't buffer input, so when the screen is scrolled, several characters are lost during the scrolling process. This could be fixed by padding, but I'm looking for a less kludgey solution. What I'd like to know is how to control the asynchronous communications interrupts: how to set the interrupt contol port, what other ports need to be fiddled with, etc, and what interrupts are actually generated. Thanks in advance. -- Chris Metcalf (metcalf@ucbmiro.BERKELEY)