Star Micronics lC-10, Technical Manual

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GENERAL SPECIFICATIONS
3-2. Commodore Interface
Pin No. Signal Name Direction Functional Description
1 SRQ OUT
2 GND
3 ATN IN
4 CLK IN
5 DATA IN/OUT
6 RESET IN
Not used.
Signal ground.
Serial Attention In
High ..................... Signifies the data transfer mode.
Low ..................... Signifies the command transfer mode.
Serial Clock In
The printer begins reading data on the rising edge of this signal.
Serial Data In/Out
IN: Conveys commands and data from the computer to the printer
OUT: High indicates printer ready Low indicates printer busy.
When this signal level goes low, the printer is initialized
and the memory buffer is cleared.