HD44780 update:

- howto updated
- input pin readout reversed
- 4bit and serialLpt init timing modified

server/drivers/lpt-port.h

@@ -23,21 +23,23 @@
 /* Output data
  * Write to baseaddress+0
  */
-// Straight-forward use, no defines needed for this...
+/* Straight-forward use, no defines needed for this... */
 
 
 /* Control output lines
  * Write to baseaddress+2
  */
-#define nSTRB 	0x01	/* negative logic */
+#define nSTRB 	0x01	/* pin 1; negative logic */
 #define STRB 	0x01
-#define nLF 	0x02
+#define nLF 	0x02	/* pin 14 */
 #define LF 	0x02
-#define INIT 	0x04	/* the only positive logic output line */
-#define nSEL 	0x08
+#define INIT 	0x04	/* pin 16; the only positive logic output line */
+#define nSEL 	0x08	/* pin 17 */
 #define SEL 	0x08
-#define ENIRQ	0x10	/* Enable IRQ via ACK line */
-#define ENBI	0x20	/* Enable bi-directional port */
+#define ENIRQ	0x10	/* Enable IRQ via ACK line (don't enable this without
+			 * setting up interrupt stuff too) */
+#define ENBI	0x20	/* Enable bi-directional port (is nice to play with!
+			 * I first didn't know a SPP could do this) */
 
 #define OUTMASK	0x0B	/* SEL, LF and STRB are hardware inverted */
 			/* Use this mask only for the control output lines */
@@ -47,13 +49,13 @@
 /* Control input lines
  * Read from baseaddress+1
  */
-#define nFAULT	0x08
+#define nFAULT	0x08	/* pin 15 */
 #define FAULT	0x08
-#define SELIN	0x10
-#define PAPEREND  0x20
-#define nACK	0x40
+#define SELIN	0x10	/* pin 13 */
+#define PAPEREND  0x20	/* pin 12 */
+#define nACK	0x40	/* pin 10 */
 #define ACK	0x40
-#define BUSY	0x80
+#define BUSY	0x80	/* pin 11 */
 #define IRQ	0x02
 
 #define INMASK	0x84	/* BUSY input and the IRQ indicator are inverted */