Posted By
gerliczer
on 2019-10-30
07:09:40
|  Re: C16 Expansion Port to User Port
You should hope that I'm horribly wrong, but according to my understanding of how the things are this will be a very rough ride if not completely hopeless.
a) You should refer to the VIA Register Map and find the address of Port B Data Register relative to the first register of the chip. You should subtract this number from 64770 to get the base address of the VIA. (My guess would be 64698/$FD00.) Use this base address incremented by the register number of the necessary output lines to program your port.
b) WiModem is most probably an RS-232 serial device. VIA has no built-in support for this type of connection. Good luck with replicating the necessary driver from some C64 terminal program or from the C64 KERNAL if it has something like that. (IDK where and how you can find these.) But if you are lucky Compute Mit also published the serial driver for this expansion.
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