Brand new used C-64 PC - test-drb@ccmp.vtda.org

15 Mar 2000

Jim Strickland wrote:

...
  The serial port on the c64 IS RS232 compatible, but it
uses ttl level signals
 instead of the normal ones.  The adapters just (if memory serves) raise the
 signal levels to rs232 standards.  It only goes up to 2400 baud with the
 existing bios, although the chip goes (I think) to 9600 if you reprogram it.

 For this reason plugging the serial printer into any standard RS232 device is
 probably not a good idea. 
For the uninitiated, I think I must at this point issue a warning:

THERE ARE TWO SERIAL PORTS ON THE COMMODORE 64.

One is a (can't remember how many. 5+/-1)-pin DIN connector.  This is
Commodore's serial version of GPIB, and is where disk drives and things go.

The other is the RS232.  I can't remember whether that's a separate connector,
or simply pins on the user port.

I would guess the printer goes in the same port as the disk drive, if it is one
of Commodore's own-badged Epson things.  IIRC you daisy chain them - one cable
64 - Disk drive, next cable disk drive - printer, etc.

Philip.

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