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CENTRONIC IBM 25W (Updated May 04)
Pin Signal Pin
1 Data Strobe 1
2 DATA 1 2 25Way Plug Rear
3 DATA 2 3 13 1
4 DATA 3 4 \ x x x x x x x x x x x x x /
5 DATA 4 5 \ x x x x x x x x x x x x /
6 DATA 5 6 25 14
7 DATA 6 7
8 DATA 7 8
9 DATA 8 9
10 ACK 10 36Way Centronic Plug rear
11 BUSY 11 18 1
12 PAPER END 12 \ x x x x x x x x x x x x x x x x x x /
13 SELECT 13 \ x x x x x x x x x x x x x x x x x x /
14,16 0V (AUTO FEED?) 14 36 19
17 Ground
18 +5V
19-30 0V Returns 10-23
31 INPUT PRIME (INIT) 16
32 FAULT 15
33 0V 18 & 25
36 SELECT IN 17

****************Parallel Port Input & Output**************************
There are 3, 8 bit Ports Connected to the Parallel Printer Port At the Back of your PC. This can be used quite easily for Imputing & Outputting Data to & from the PC. Not all bits are settable so you will have to read the ports & Mask off the Input data using AND & OR Functions.

Port &H378

These Pins are Outputs Only But their current settings may be read back using Most Modern BASICs.

The Basic Command to Output Data onto these Pins is

Value%=21 (or whatever you require) OUT &H378,Value

The Data Output is Latched, IE once Written it stays there until overwritten by new data.

Pin Name Port Bit Direction
2 &H378 0 > Out Current status
3 &H378 1 > Out of these
4 &H378 2 > Out Pins may also
5 &H378 3 > Out be read
6 &H378 4 > Out Back Using BASIC
7 &H378 5 > Out command
8 &H378 6 > Out X%=INP(378)
9 &H378 7 > Out Print X%
********************** Port &H37A ************************
1 Strobe &H37A 0 > OUT To Output Data
14 Auto &H37A 1 > OUT onto these Pins
16 Init &H37A 2 > OUT Use the same command
17 Slct In &H37A 3 > OUT But Port is 37A
5
4 Int En
********************** Port &H379 ************************
These Pins may be used for Input, Port Number is &H379
13 Slct &H379 4 < IN These Pins may be
11 Busy &H379 7 < IN Used for I/P to PC
12 PE &H379 5 < IN using X%=INP(&H379)
10 ACK &H379 6 < IN Print X%
15 Error &H379 3 < IN **************************************************************
Pins 18 to 25 are Ground Pins **************************************************************
Sending a 1 to Bit 4 of Port &H37A will enable the Printer card interrupt.
This interrupt triggers when Pin 10 goes from Hi to lo. Sending a 0 to Bit 4 of Port &H37A will disable the Printer card interrupt.

Writing data to these ports causes Printing Problems afterwards. Either switch PC Off the On or Use Sleep Command before Printing.

------------------------------------------------------------------------------ Michel, F5AAJ @ F6KDS says for the status, you have to read &H378 (I wrote X%=INP(378). You can use, too, PRINT (INP(&H378)). Idem, for the output on a port, you can write OUT &H378,21 or OUT &H378,&H15, by example...


Why Don't U send an interesting bul?

73 De John, G8MNY @ GB7CIP

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