Back in the mid 90's I've built a centronics printer cable for my plus/4. It used the 6529 for data and two pins of the ACIA for handshake (I can't remember which two of them but I have the sources somewhere). It required some initialization to use them as a fixed state pin but not too complex. I used it to print to a HP laser printer. 2012.03.06. 17:21, "Gerrit Heitsch" <gerrit@laosinh.s.bawue.de> ezt írta: > On 03/05/2012 11:10 PM, Gábor Lénárt wrote: > >> Hi, >> > > >> I prefer user port, because it exists on other machines as well, not just >> C64. Like Plus/4. And it's my another question: it's not so clear for me: >> has the Plus/4 some similar handshaking possibilities via its user port as >> the C64/CIA has? >> > > No. The Plus/4 user port is completly different. The I/O-Bits are the > portbits of a 6529B, one of them used to detect the button press for the > datasette (If no tape is attached you have all 8 bits). Those are just I/O, > no handshake other features available. You don't even have a data direction > register. To use a bit as input, write a '1' to it before reading it. > > The Plus/4 also has a real ACIA (8551/6551A) for the RS232. You only need > a few inverters and a MAX232 to be able to use it with a modem or a PC on > the other side. Without modification, you can reach 19200 bps. This also > means you cannot easily 'abuse' those I/O bits for other purposes. > > Gerrit > > > > Message was sent through the cbm-hackers mailing list > Message was sent through the cbm-hackers mailing listReceived on 2012-03-06 17:00:35
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