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pinout (распиновка)

CoCo Serial Printer connector

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Available on the Tandy Color Computer, also known as CoCo.

4 pin DIN 270° FEMALE connector  at the computer
Pin Name Description
1 NC  
2 /BUSY Enabled when the printer is busy
3 GND  
4 DATA RS-232 level data

Источник: Tandy TRP 100 printer manual