rick@genrad.UUCP (Rick Frerichs) (02/15/84)
Has anyone every successfully modified their bios to handle xon/xoff protocol for the console in a non-interrupt polled system. This would probably require some sort of buffer arrangement, but characters would only be noticed if some program or the ccp was polling the status port. I am also interested in handling a terminal (vt100) where the special function keys send out three characters one after the other. This is particularly nasty when using them for an editor as characters are often lost. right now, i have my cns$ot routine sending out 10 nulls when it detects a line feed so that the terminal has time to scroll. ( i have another terminal which also requires this because of the xon/xoff problem). I have an S-100 system built with assorted boards (including Ithaca Audio z80 board and Jade Double D Disk Controller. Am I going to have to add an interrupt controller to resolve the above mentioned problems? I forgot to mention that this is for cp/m version 2.2 I would very much appreciate any information that anyone has. Thank you, Rick Frerichs uucp: decvax!genrad!rick tel: 617-779-2811 x6435
MMOON.ES@PARC-MAXC.ARPA (02/25/84)
Message me if you get any ratiional suggestions; L50 can be used to good effect in xon/xoff mode if the 'frame speaks the same. MMoon.es
POURNE@Mit-Mc.ARPA (03/28/84)
From: Jerry E. Pournelle <POURNE@Mit-Mc.ARPA> We've done it with a Compupro systems support board, without interrupts, but if you want to run that terminal at any great speed, you will do better to go to interrupt driven software. Or use a hardware protocol for handshaking.