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Tech Stuff - IBM Printer Port

The standard IBM parallel/printer port on a 'common or garden' x86 type PCs. Pretty rare these days (most printers connect using a USB port) so it now probably deserves the accolade - Legacy.

IBM Printer Port Pin-out(DB-25)

The Printer/parallel port uses a standard DB-25 connector. The FEMALE end of this connector (without the bits sticking out) is at the Host/PC. This connector can be, and is, used for all kinds of 'things' so beware and check the pin-out if you are using something exotic.

Apology We incorrectly stated that the host end had the MALE connector - seems we got our MALE and FEMALE mixed up. Put it down to the need for glasses, stupidity or major confusion over the reproductive process as you choose.

DB25 Male

View into Male end

DB25 Pin Name Function/Notes
1 Data Strobe Active LOW
2 Data Bit 1 LSB
3 Data Bit 2 -
4 Data Bit 3 -
5 Data Bit 4 -
6 Data Bit 5 -
7 Data Bit 6 -
8 Data Bit 7 -
9 Data Bit 8 MSB
10 Acknowledge Active LOW
11 Busy Active HIGH
12 Paper End Active HIGH
13 Select Active High
14 Auto Line Feed Active LOW
15 Error Active LOW
16 Initialize
Printer
Active LOW
17 Select Input Active LOW
18, 19, 20, 21, 22, 23, 24, 25 Return Ground


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