C64 RS232 User port pinout

serial interface

24 pin DZM 12 DREH connector
at the computer

Pin	Name	RS232	Description
A	GND	GND	Protective Ground
B+C	FLAG2+PB0	RxD	Receive Data (Must be applied to both pins!)
D	PB1	RTS	Ready To Send
E	PB2	DTR	Data Terminal Ready
F	PB3	RI	Ring Indicator
H	PB4	DCD	Data Carrier Detect
K	PB6	CTS	Clear To Send
L	PB7	DSR	Data Set Ready
M	PA2	TxD	Transmit Data
N	GND	GND	Signal Ground

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Source(s) of this and additional information: Usenet posting in comp.sys.cbm, Help on modem - c64 by Lasher Glenn, Commodore 64 Programmer´s Reference Guide, from Hardware Book, Arwin Vosselman, Mark Sokos

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C64 RS232 User port pinout

serial interface

Available on the Commodore C64/C128. Software emulated. The signals does not have true RS232 levels. It's TTL level, and RXD/TXD is inverted. It's just the normal User port, used as a RS232 port.