RS-232 and other serial ports and interfaces  > obsolete computers pinouts
Available on the Tandy Color Computer, also known as CoCo.
Pin Name Description
1 NC  
2 /BUSY Enabled when the printer is busy
3 GND  
4 DATA RS-232 level data
4 pin DIN 270 connector layout
4 pin DIN 270 connector
at the computer
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Source(s) of this and additional information: Tandy TRP 100 printer manual ; Rob Gill
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