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CBM-920 User’s Manual
23 CITIZEN
5.3 Explanation of Input/Output Signals
1) Input Signals into Printer
DATA 1 .................. 8 bit parallel signal (positive logic)
DATA 2 .................. 8 bit parallel signal (positive logic)
DATA 3 .................. 8 bit parallel signal (positive logic)
DATA 4 .................. 8 bit parallel signal (positive logic)
DATA 5 .................. 8 bit parallel signal (positive logic)
DATA 6 .................. 8 bit parallel signal (positive logic)
DATA 7 .................. 8 bit parallel signal (positive logic)
DATA 8 .................. 8 bit parallel signal (positive logic)
STB......................... Strobe signal to read 8 bit data (negative logic)
RESET.................... Signal to reset the whole printer (negative logic)
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2) Output Signals from Printer
ACK........................ 8 bit data request signal (negative logic)
BUSY ................... Signal to show BUSY state. Input new data at "LOW" (positive logic)
PE............................ Signal to indicate shortage of paper (positive logic)
FAULT.................... Signal to indicate occurrence of trouble, such as mechanical al arm (positive logic)