EPSON Stylus Color 440/640/740 - el Museo de los 8 Bits

EPSON Stylus Color 440/640/740Revision APin No.Table 1-10. Parallel I/F Forward ChannelSignalNameReturnGND Pin1 /STROBE 19 I2-9 DATA0-7 20-27 IIn/Out Functional DescriptionThe strobe pulse. Read-in of data isperformed at the falling edge of thispulse.The DATA0 through DATA7 signalsrepresent data bits 0 to 7, respectively.Each signal is at high level when data islogical 1 and low level when data islogical 0.10 /ACKNLG 28 OThis signal is a negative pulse indicatingthat the printer can again accept data.11 BUSY 29 OA high signal indicates that the printercannot receive data.12 PE 28 O A high signal indicates paper-out error.13 SLCT 28 OAlways at high level when the printer ispowered on.14 /AFXT 30 I Not used.31 /INIT 30 IThe falling edge of a negative pulse or alow signal on this line causes the printerto initialize. Minimum 50 us pulse isnecessary.32 /ERROR 29 OA low signal indicates printer errorcondition.36 /SLIN 30 I Not used.18 Logic H ---- O Pulled up to +5V via 3.9K ohm resistor.35 +5V ---- O Pulled up to +5V via 3.9K ohm resistor.17ChassisGND---- --- Chassis GND.16,33,19-30GND ---- --- Signal GND.15,34 NC ---- --- Not connected.Note) In and Out refer to the direction of signal flow from the printer’s point of view.Chapter 1 Product Description 26