Citizen Systems CBM-920 5.3 Explanation of Input/Outpu t Signals

CBM-920User’s Manual
23 CITIZEN
5.3 Explanation of Input/Outpu t Signals
1) Input Signals into Pr inter
DATA1 .................. 8 bit parallel signal (positive logic)
DATA2 .................. 8 bit parallel signal (positive logic)
DATA3 .................. 8 bit parallel signal (positive logic)
DATA4 .................. 8 bit parallel signal (positive logic)
DATA5 .................. 8 bit parallel signal (positive logic)
DATA6 .................. 8 bit parallel signal (positive logic)
DATA7 .................. 8 bit parallel signal (positive logic)
DATA8 .................. 8 bit parallel signal (positive logic)
STB......................... Strobe signalto read 8 bit data (negative logic)
RESET.................... Signal to reset the whole printer (ne gative 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 da ta at "LOW" (positive l ogic)
PE............................Signal to indicateshortage of paper(positive l ogic)
FAULT....................Signal to indicate occurrence of trouble, such asmechanic al ala rm( positivelogic)