The following information is provided as a reference for people looking to connect electronics projects to their PC.
DB25 Parallel Port (Printer)
| PIN NO. | FUNCTION | TYPE |
| 1 | STROBE | CONTROL |
| 2 | DATA BIT 0 | OUTPUT |
| 3 | DATA BIT 1 | OUTPUT |
| 4 | DATA BIT 2 | OUTPUT |
| 5 | DATA BIT 3 | OUTPUT |
| 6 | DATA BIT 4 | OUTPUT |
| 7 | DATA BIT 5 | OUTPUT |
| 8 | DATA BIT 6 | OUTPUT |
| 9 | DATA BIT 7 | OUTPUT |
| 10 | ACKNOWLEDGE | STATUS |
| 11 | BUSY | STATUS |
| 12 | PE: PAPER TRAY EMPTY | STATUS |
| 13 | PRINTER ON-LINE | STATUS |
| 14 | AUTO LINEFEED AFTER (CR) | CARRIAGE RETURN CONTROL |
| 15 | PRINTER ERROR | STATUS |
| 16 | INITIALIZE PRINTER | CONTROL |
| 17 | SELECT/DESELECT PRINTER | CONTROL |
| 18-25 | UNUSED/GROUND | Â |
DB9 (9 Pin Serial)
PIN NO. FUNCTION TYPE
1 DCD Data Carrier Detect
2 RD Receive Data (a.k.a RxD, Rx)
3 TD Transmit Data (a.k.a TxD, Tx)
4 DTR Data Terminal Ready
5 SGND Ground
6 DSR Data Set Ready
7 RTS Request To Send
8 CTS Clear To Send
9 RI Ring Indicator
+-----------------------------+
DTE DCE
+-----------------------------+
TD ----> TD
RD <---- RD
RTS ----> RTS
CTS <---- CTS
DSR <---- DSR
SG ----- SG
DCD <---- DCD
DTR ----> DTR
DB15 (15 Pin Game Port)
PIN NO. FUNCTION
1 XY1 (+5v)
2 Switch 1
3 X1
4 Ground (for switch 1)
5 Ground (for switch 2)
6 Y1
7 Switch 2
8 N.C.
9 XY2 (+5v)
10 Switch 3
11 X2
12 Ground (for switch 3&4) *
13 Y2
14 Switch 4
15 N.C. *
More coming soon…
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