Hardware pinouts information and cables schemes

C64 RS232 User port pinout

serial interface

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x pins UNKNOWN connector layout
x pins UNKNOWN connector
at the computer

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.

Pin Name RS232 Description
AGNDGNDProtective Ground
B+CFLAG2+PB0RxDReceive Data (Must be applied to both pins!)
DPB1RTSReady To Send
EPB2DTRData Terminal Ready
FPB3RIRing Indicator
HPB4DCDData Carrier Detect
KPB6CTSClear To Send
LPB7DSRData Set Ready
MPA2TxDTransmit Data
NGNDGNDSignal Ground

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Pinouts.ru > RS-232 and other serial ports and interfaces pinouts listing > Pinout of C64 RS232 User port and layout of connector
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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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Last updated 2008-08-10 22:37:59. Edit this page. Is this document correct or incorrect? What is your opinion?
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