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Top Forums Programming Read 1 of 2 keyboards connected Post 302980976 by bakunin on Monday 5th of September 2016 10:21:45 PM
Old 09-05-2016
Quote:
Originally Posted by wisecracker
Note there were only 3 keys pressed and 1 combination of keys...
If i remember correctly the original PC keyboard was built on the Intel MCS-48 microcontroller, namely the 8042, all PC hardware still reflects that. The mcirocontroller sends so-called "make-" and "break-codes" to the main computer, which basically reflect pressing and releasing a key. Scancodes tell which key exactly was pressed (at this level is i.e. possible to separate the left from the right SHIFT key being pressed, etc.)

In the original design (but i have long since stopped to update my PC hardware knowledge) it used not only the BIOS-interrupt 09h, it also controlled the A20 gate, which was done because of a bug in the 80286 design (it couldn't get back from protected to real mode without a reboot).

I hope this helps.

bakunin
 

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kmflcomp(1)						      General Commands Manual						       kmflcomp(1)

NAME
kmflcomp - keyboard mapping for linux compiler SYNOPSIS
kmflcomp -v kmflcomp [-d] [-f] [-V] keyboardfile kmflcomp -h DESCRIPTION
KMFL is a keyboard input method project which brings Tavultesoft Keyman functionality to *nix operating systems. kmflcomp is the keyboard compiler and syntax checker for the kmfl project. The files created by kmflcomp can be loaded by the kmfl libraries to provide input methods to clients. Note that the kmfl libraries now have the capability to compile kmfl keyboards on the fly so kmflcomp is no longer strictly necessary. The most useful part of kmflcomp is its kmfl keyboard syntax checking. OPTIONS
-d Output debugging information -f Force compilation even if there are errors found in the keyboard file -h Print this help message -V Be more verbose in kmfcomp's information messages -v Print program version SEE ALSO
The full documentation for kmflcomp can be found on the kmfl website (kmfl.sourceforge.net). This includes documentation for the kmfl lan- guage syntax, useful for creating new keyboards, or modifying existing keyboards. AUTHORS
KMFL was developed jointly by SIL international(www.sil.org) and Tavultesoft(www.tavultesoft.com). The primary authors are John Durdin and Doug Rintoul. kmflcomp 0.9.8 February 2009 kmflcomp(1)
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