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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itemap(1M) itemap(1M)
NAME
itemap - load an ITE (Internal Terminal Emulator) keyboard mapping.
SYNOPSIS
[options]
DESCRIPTION
The command loads a keyboard mapping into the ITE (the graphics console driver), or displays ITE keyboard mappings. is run by automati-
cally. It is not usually explicitly invoked by the user.
Options
Dump a keymap to standard output in hexadecimal notation.
Load the specified keymap into the kernel mapping table
used for keyboards.
Interactively prompt for a
keyboard mapping. scans the keymap database file for all mapping names beginning with a prefix. Each of these names is
displayed, and one must be selected.
The name of the keymap database file to be used for input.
The default is
Load the appropriate keymap.
scans the hardware for a keyboard, determines the language of that keyboard, and loads the keymap corresponding to that
keyboard.
Because cannot determine the language of keyboards, use the option when using with keyboards.
Load a specified keyboard map.
Once loaded, ITE uses the specified mapping.
When loading a keyboard mapping with the option, matches the suffix of the name of the specified keyboard mapping with
those found in to determine the keyboard language. This information is used by the ITE to perform ISO 7-to-8 bit conver-
sion. Keymap names added by users, via
should use the same suffixes as those already used in For example, a French keyboard mapping can be named for consistency
with existing and mappings. A mapping called would not match any suffix patterns found by itemap, and would result in
incorrect ISO 7-to-8 bit conversion.
Load the specified keymap into the kernel mapping table
used for keyboards.
Perform actions verbosely.
If a keymap for a
keyboard is loaded, write its name to file_name.
EXAMPLES
To automatically install the correct mapping for an keyboard:
To explicitly load the mapping for an keyboard:
To explicitly load the mapping for a keyboard:
To interactively choose a keyboard mapping:
To generate a list of the available keyboard mappings:
FILES
Keymap database editor
System keymap database
Contains mapping name configured for keyboards
SEE ALSO
ps2(7), termio(7), keymap_ed(1X111).
itemap(1M)