The Commodore User port found in the Commodore 8-bit computers, despite its claim to
being RS232 compliant, most certainly is not. It uses a nonstandard
edge connector and a different voltage than is standard for RS232C.
The VIC-1011a allows one to plug in and use standard RS232C devices at
standard RS232C voltages into any Commodore computer with a CBM User port.
Model : VIC-1011A Type : RS232C Cartridge Resources : Converts CBM RS232 <-> RS232C Connection: CBM User port Notes :
The VIC-1011B is a "Current Loop" type RS-232 expansion device.
Model : VIC-1011B Type : Current Loop RS232 Cartridge Resources : Converts CBM RS232 <-> RS232 Current Loop Connection: CBM User port Notes :
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