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Asynchronous Console Communications Device extension - Video Calls under Console Mode

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From: ohl...@charter.net (Louis Ohland)
Newsgroups: comp.sys.ibm.ps2.hardware
Subject: Asynchronous Console Communications Device extension - Video Calls
under Console Mode
Date: Tue, 17 Jan 2023 08:33:37 -0600
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by: Louis Ohland - Tue, 17 Jan 2023 14:33 UTC

https://www.ardent-tool.com/3151/#Video_Calls

Tom, your write-up hits everything but the name

"In the console mode they are overriding all video calls (Int 10) with a
special table that transforms it to some special serial port calls
(undocumented Int 14 functions 60-64 - exclusively used by the serial
console code)"

"Asynchronous Console Communications Device extension" is this a table
or "special serial port calls" ?

http://localhost:8088/docs/patent/US5193174.pdf Page 11

SOFTWARE SUPPORT FOR ASCII TERMINAL
To support an ASCII terminal as the system console, additional functions
are added as internal interfaces along with an additional internal
function call to BIOS System Services for system console determination.
The Asynchronous Console Communications Device extension provides
functions that allow the user to communicate with an ASCII terminal.

MAJ Tom signaled:

Quick & dirty list of the undocumented Int 14 functions:

Int 14 AH=60h - Initialize and attach CONSOLE Device
Int 14 AH=61h - CONSOLE Input
Int 14 AH=62h - CONSOLE Output Character (AL - char)
Int 14 AH=63h - CONSOLE Output String (ES:SI - string ptr)
Int 14 AH=64h - Remove CONSOLE Device

Subject	Author
Asynchronous Console Communications Device extension - Video Calls	Louis Ohland

lp1 on fire -- One of the more obfuscated kernel messages

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