AT/PS2 Keybord - PIC Interface?

[mytekcontrols]

I tweaked the code in order to better mimic the actions of the keypad on a PC. Specifically I now have shifted functions in both NumLock and non-NumLock modes as outlined below:

NumLock Mode:
Shift-Up --- numbers are generated 0,1,2,3... (ascii $30 - $39)
Shift-Dn --- standard navigation INSERT, END, DOWN... (ascii $90 - $99)

non-NumLock Mode:
Shift-Up --- standard navigation INSERT, END, DOWN... (ascii $90 - $99)
Shift-Dn --- numbers are generated 0,1,2,3... (ascii $30 - $39)

Note: when in a number output mode, the delete key on the numpad = ".", else it generates the ascii $7F code for delete. Also please notice that all ascii assignments above $7F are of my choosing, and not a part of the standard ascii code set.

Code space requirements have gone up to 2666 with this new version.