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pinout (распиновка) |
C64 RS232 User Port connector
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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.
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UNKNOWN connector at the computer |
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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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Источник: Usenet posting in comp.sys.cbm, Help on modem -> c64 by Lasher Glenn
Sources: Commodore 64 Programmer's Reference Guide
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