#500/2000 PORT PROBLEM
6 messages in this thread
I helped develop a hardwire cable and program to link the Commmodore 64
and the Amiga 1000. My problem is that the serial port on the 500/2000 is
slightly different than on the A1000. The pins that are used on the A1000 are
2-9 and 14. I know that pins 2-8 are the same but I need to know how pins 9, 14
are different and how I can change the cable to work on the 500/ 2000.
I don't get a chance to call often so if you have any suggestions, please
send them via Easyplex.
THANKS
Lawrence Niebauer
(74017,450)
Lawrence,
My suggestion would be to use 3 wires only, on pins 2, 3, and 7.
Regards, Larry.
THANKS FOR YOUR SUGGESTION BUT I REALLY DON'T UNDERSTAND YOUR MESSAGE TO WELL
PLEASE EXPLAIN IN SOME DETAIL WHAT YOU MEAN. ALSO THE PROGRAM I HAVE WORKS
TERRIFIC ON THE 1000. COULD I GET THE SAME RESPONSE WITH ONLY THE THREE WIRES
(WOULD IT WORK AND WHICH PINS ON THE C-64
WOULD I USE??)
THANKS
LARRY
Larry,
The three wires are all that are needed, assuming that you have an RS232
adapter for the 64. (I made that assumption because you were talking about a
cable with more wires).
Connect the three wires as follows:
Amiga pin 7 to 64 pin 7
Amiga pin 2 to 64 pin 3
Amiga pin 3 to 64 pin 2
Do not try this unless you have an RS232 adapte on the 64.
Regards, Larry.
larry,
ON MY CABLE I GO FROM THE RS232 PORT ON THE A100 TO THE COMMODORE 64 USERS
PORT IT HAS 24 PINS I DID IT THIS WAY BECAUSE IT IS VERY HARD TO FIND A CHEAP
RS232 PORT FOR THE C-64
THANKS
LARRY
Larry,
This will not work. You stand a chance of frying something at worst, and of
not having it work at best. The reason there are RS232 adapters available for
the 64 is because the 64 has only a user port operating at a voltage range
between 0 and +5V. The adapter is to convert the signals to RS232 levels, which
range between +12V and -12V. Putting -12 onto an output pin of the user port is
not healthy for the silicon on eiether end of the wire.
Regards, Larry.