> What would you load to the timer register to emulate a raster > interrupt? I never had a "new" C64. $4cc7 worked for me. It is > 312*63-1. On the 6522 VIA (VIC-20), you will have to subtract 2 > instead of 1. The same value should work. The difference here between old and new CIA chips is that the old chips trigger the timer IRQ a cycle later than the new chips; they do have the same period for continuous mode though. > One more interesting trick is distinguishing the left shift from > shift lock. The shift lock key should have a lower resistance. If > you program one of the connected keyboard matrix lines as an output > '1' and another as an output '0', the shift lock will force the '1' > output to '0', but the normal left shift key won't. Fun! Segher Message was sent through the cbm-hackers mailing listReceived on 2011-12-09 23:00:04
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