Note: Availble on the Commodore C64/C128. Software emulated. The signals do 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.
Pin Function RS232 Details
A
GND
GND
Protective Ground
B+C
FLAG2+PB0
RxD
Receive Data
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
**Must be applied to both pins
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