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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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SETUPCON(1)						    Console-setup User's Manual 					       SETUPCON(1)

NAME
setupcon - sets up the font and the keyboard on the console SYNOPSIS
setupcon [OPTION]... [VARIANT] DESCRIPTION
setupcon is a program for fast and easy setup of the font and the keyboard on the console. Most of the time you invoke setupcon without arguments. The keyboard configuration is specified in ~/.keyboard or /etc/default/keyboard. The font configuration is specified in ~/.console-setup or /etc/default/console-setup. Consult keyboard(5) and console-setup(5) for instructions how to configure these two files. If you have to switch often between different encodings, keyboards or languages, you can prepare several alternative configuration files for setupcon. Suppose that most of the time you will use Greek language with Greek keyboard layout, but sometimes you need to type in Ger- man with German keyboard layout. In this situation you should customize the main configuration files (keyboard and console-setup) for Greek. Create also alternative configuration files for German named keyboard.german and console-setup.german. Then in order to configure the console for Greek you will simply run the command with no arguments: setupcon and in order to configure the console for German you will use setupcon german. OPTIONS
-v, --verbose Be more verbose. Use this option if something goes wrong or while experimenting with the configuration files. -k, --keyboard-only Setup the keyboard only, do not setup the font. -f, --font-only Setup the font only, do not setup the keyboard. --force Do not check whether we are on the console. Notice that you can be forced to hard-reboot your computer if you run setupcon with this option and the screen is controlled by a X server. --save This option can be useful if you want to use setupcon early in the boot process while /usr is not yet mounted and the required data are not available. This option will make setupcon copy the required files in /etc/console-setup/ in order to make them available before /usr is mounted. If you use setupcon early in the boot process, then you should run it with this option after every change of the console configuration. --save-only The same as --save, but does not setup the keyboard and the font. This option can be useful if you want to save the required files while the screen is controlled by a X server. -h, --help Display usage information. VARIANT Specifies which configuration file to use. By default the configuration files of setupcon are named console-setup and keyboard but if you use e.g. chukchi as VARIANT then the configuration files will be console-setup.chukchi and keyboard.chukchi. In this way you can have easy access to several different configurations - for example one for the Chukchi language and another for the default configuration. FILES
~/.console-setup ~/.keyboard /etc/default/console-setup /etc/default/keyboard /etc/default/console-setup.VARIANT /etc/default/keyboard.VARIANT /etc/console-setup/ SEE ALSO
keyboard(5), console-setup(5) console-setup 2011-03-17 SETUPCON(1)
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