The Printer Port:

BASE+0 one Byte with Data D0-D7
 2 io D0
 3 io D1
 4 io D2
 5 io D3
 6 io D4
 7 io D5
 8 io D6
 9 io D7

BASE+1 
10 i  ACK            BIT 6 (1=HIGH)
11 i  -BUSY          BIT 7 (0=HIGH)
12 i  PE             BIT 5 (1=HIGH)
13 i  SLCT           BIT 4 (1=HIGH)

BASE+2
 1  o -STROBE        BIT 0 (0=HIGH)
14  o -AUTO_FD_XT    BIT 1 (0=HIGH)
16  o -INIT          BIT 2 (0=HIGH)
17  o -SLCT_IN       BIT 3 (0=HIGH)

18-25 GROUND

Connect the LCD-DISPLAY to the Printer Port !!			

	LCD			PRINTER-PORT
 1 GND      ( 0Volt)                  25-GND
 2 VCC      (+5Volt)                  14-BIT1
 3 Contrast (-4Volt)                  extern power
 4 RegSLCT  (Register Select)         16-BIT2
 5 r/w      (Write = GND=0V )         25-GND        
 6 enable   (Impuls = Datenübernahme) 17-BIT3
 7-14 DATA  (8Bit Data)               2-9

At PIN3 (Contrast) you must Connect an negative Voltage between -2 and -4 Volt.

(c) Mirko Roller