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
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