From: utzoo!decvax!harpo!floyd!whuxlb!jph
Newsgroups: net.micro.pc
Title: Re: Re: XT Async Port Query - (nf)
Article-I.D.: whuxlb.1077
Posted: Sun Apr 24 08:44:29 1983
Received: Mon Apr 25 06:19:50 1983

#R:sri-arpa:-105900:whuxlb:6400001:000:913
whuxlb!jph    Apr 24 07:55:00 1983

If you wish to write your own async port handling
software, the best thing to do, besides reinventing the
wheel and writing an interrupt driven device handler,
is to get the IBM Async Communication Support (ACS)
software. This includes a routine which is callable
from BASIC and handles the async port on an interrupt
basis and will allow you to handle the line upto
19.2KB. Documentation on the interface to the routines
is given in version 1.0 of the ACS, but for some reason
in version 2.0, they did not supply it. It turns out to
be very easy to  write an assembly language routine to
interface with other language. That is what I did to
write a terminal simulator in PASCAL. It definitely
saves you a lot of time in trying to implement
something like that and lets you spend time on putting
in bells and whistles.

If anyone would like more information on how to use,
contact me.

Jim Holtman
...!whuxlb!jph