> > What address is the userport at and the DDR for it? > > $DD02 is the DDR, and $DD03 is "Port B" (the main port). $DD00/1 are the > corresponding addresses for the few bits of Port A that are available at > the User Port. And of course I wrote these wrong..... I realized last night (while I was away from the computer) that these should have been $DD00 for Port A, and $DD01 for Port B, and $DD02/3 for the DDRs (respectively). The actual ports still behave as otherwise described, I just screwed up the addresses. The port is 100% C64 compatible. Can't speak for the VIC-20 though. > Regarding only the data lines.. > > 9: /ATN (/PA3) Also, I forgot to mention that /ATN is an output-only line, due to hardware inside the C64, outside of the CIA, which is also responsible for this line being inverted. -- ___________________________________ _____ _____ | _///@@@| | | email@example.com /'//ZZ@@|____ | | |'''/ |'/@7 | | http://home.kscable.com/natedac |`'| `~~' | | | `| .--. | | C64/C128 - What's *YOUR* hobby? | `\____|___\ | | \_ | | |___________________________________ \_____| _____| - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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