On 07/23/2016 09:08 PM, Segher Boessenkool wrote: > > Why do you think you can set all port bits on the 8500? Forgot that in the last post... There is also the 6510T as used in the 1551 floppy drive. It has the full 8 Bit port. To me the pinout suggests that it's just a different bond out of the 6510: _______ _______ _RES [1 V ] Phi2 Phi0 [1 V ] _RES Phi0 [ ] R/_W _HALT [ ] Phi2 _IRQ [ ] D0 _IRQ [ ] R/_W AEC [ M ] D1 _NMI [ M ] D0 Vcc [ O ] D2 AEC [ O ] D1 A0 [ S ] D3 Vcc [ S ] D2 A1 [ ] D4 A0 [ ] D3 A2 [ 6 ] D5 A1 [ 6 ] D4 A3 [ 5 ] D6 A2 [ 5 ] D5 A4 [ 1 ] D7 A3 [ 1 ] D6 A5 [ 0 ] P0 A4 [ 0 ] D7 A6 [ T ] P1 A5 [ ] P0 A7 [ ] P2 A6 [ ] P1 A8 [ ] P3 A7 [ ] P2 A9 [ ] P4 A8 [ ] P3 A10 [ ] P5 A9 [ ] P4 A11 [ ] P6 A10 [ ] P5 A12 [ ] P7 A11 [ ] A15 A13 [ ] A15 A12 [ ] A14 GND [_______] A14 A13 [_______] GND If the 8500 didn't have all the port bits, it would be trivial to determine if your C64 has a 6510 or a 8500. So far no one has been able to do that by software. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2016-07-23 20:00:34
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