From AllPinouts
Connector pinout for: Tandy CoCo Serial Printer
Available on the Tandy Color Computer, also known as CoCo.

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

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