Commodore Pet Graphics Compatibility Mode

 This mode allows to emulate the so called «Graphics» keyboards (those with PETSCII graphics characters) used by the early Commodore PET Computer. For this Mode to work properly, you are going to need the use «.vkm» files and set your emulator to use them.

Every symbol have it’s own key in PET Keyboard, also there are just one PETSCII Graphic character per key. Also there are some «new» keys.

In order to map PET keys to C-264 Keyboard, the following changes are made:

  • CTRL key works as OFF/RVS.
  • £ (pound) key works a \ (backslash).
  • C= does not exist in PET Graphics Keyboard, however we will use it to access PETSCII graphics and symbols as explained below.
  • Function Keys (F1 to F7) do not exist in PET Graphics Keyboard, therefore they have no function. 
You can see those different keys marked in orange below:
Plus/4 Keyboard
C-16 Keyboard

Access to graphics PETSCII and symbols keys.

Keymmodore implements a special feature, able to «merge» again those two Symbols and two PETSCII Graphics in a single key, with the same layout than the C-264 Series.

For PETSCII Graphics, works just in the same way: Pressing C= for the left character, and Shift for the Rigth character (*).

For two Symbols Keys (like !/1 or >/.), press C= Key first (instead of Shift) for the upper symbol. In the following diagram you can see in green the Symbols with C= key. 

Plus/4 Keyboard
C-16 Keyboard

Remember to switch back to PC Compatibility Mode with C= and CONTROL, once you exit the emulator.

(*) Due to some key mapping limitation in Combian emulator, right PETSCII of @,+,-,* and \ keys, won’t match C-264 keyboard, matching the original PET layout instead.