Hello Nicholas, > how does the C64 kernal scan the keys - does it strobe column > by column (pa0 > - pa7, one by one) and read the answer in pb0 - pb7; or does it set all > columns at once? BOTH! At first, it sets all rows, testing if there is any key pressed. If not, that's all. If one was pressed, the kernal tests the rows one by one to identify the key. But it does not use any other combination (2..7 rows at once). HTH, Spiro. - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tml.hut.fi.
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