Commodore Pet Business Compatibility Mode

 This mode allows to emulate the so called «Business» keyboard (the one with upper and lower case letters) used by the Commodore PET Series Computer. For this Mode to work properly, you are going to need the use «.vkm» files and set your emulator to use them.

The Business keyboard has some particular keys like Brackets ([ ]), REPEAT, ESC and OFF/RVS keys. Also has a NumPad keyboard.

Mapping the Business keyboard to the C-64 keyboard is pretty straightforward, although some keys change its position. 

You can see the differences in the following diagram:

  • CTRL key works as TAB.
  • £ (Pound) key works as \ (backslash).
  • RESTORE key works as second INST/DEL.
  • F1 key works as ESC.
  • F3 key works as OFF/RVS.
  • F5 key works as REPEAT.
  • F7 key have no function.
  • C= works as a Layer or Function key as explained below.

Access to Numeric Pad and bracket Keys

Keymmodore implements a special layer with the C= key for those special keys. You can see in green the keys that change its function if you keep C= key pressed.

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