Posted By
gerliczer
on 2021-07-06
02:33:37
|  Re: Joypad for plus/4
So, I think, we have quite limited options. One would be manufacturing C64 compatible joystick interface for the Expansion Port which is not necessarily a good idea. Next would be using the joystick port of the SID-Cards but that would be too restrictive. Another way would be using the User Port as there are eight plus one or two more lines which could be used for data transfer and signalling. This method may be easily adapted to the other Commodore 8 bits with User Port too, but that would make it unusable with C16s and C116s. And finally MIK's idea in some slightly modified form like using the two joystick ports where one transmits continuously at some well tuned rate a synchronization stream and the other continuously cycles through and transmits the state data in sync with the other port. Or a combination of some of the options above.
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