dealing with a matrix keyboard

[bosone]

hi!

i have a small keypad with 12 keys arranged in a matrix (like the PC one).

i know that with some great tweaking one can handle the matrix encoding/decoding with MIOS but... is there a "standalone" version?

what i'm looking for is some simple schematic to "convert" the keypad matrix into 12 standard on/on switches (or even less, i need only 8 buttons of the 12 present)

then, i will simply connect these 12 ouput to a DIN module of the midibox without MIOS tweaking...

i have also an old pic 16f874/7 to use for this task, if needed