Posted By
MMS
on 2019-10-14
10:44:59
 |  Re: C16 Expansion Port to User Port
Guys,
just buy a Max232 circuit to the user port as described in my RS232 mouse documentation.
It is the SAME serial protocol, same for for modem and an RS232 mouse.
You will have the proper signals on the DB-9 standard RS232 connector.
In my document you can find links to similar C64 projects with the same connection, but you can even buy it ready RS232/User port for C64, it should work on Plus/4 User port too (for RS232, same pins).
For the C16 you really need an expansion port device.
If you just need a modem, the ACIA based C64 Swiftlink is exactly the one you need, but because for the C64 bus addresses, it needs a major modification. This is a more complex project, due to different connector pitch and different pins on the expansion ports.
On the other hand, I have only WIFI at home, not phone line... So...
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