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G8MNY > IBM 28.03.03 13:40l 80 Lines 3516 Bytes #999 (0) @ WW
BID : 54390_GB7CIP
Read: GUEST DB0FHN DC9BM
Subj: 25 Pin D-Type Parallel Port
Path: DB0FHN<DB0ZWI<DB0CHZ<DB0ERF<DB0FBB<DB0GOS<ON0AR<ON0AR<VK3TE<GB7YKS<
GB7PZT<GB7BHM<GB7COV<GB7CIP
Sent: 030328/1131Z @:GB7CIP.#32.GBR.EU #:54390 [Caterham] $:54390_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : IBM@WW
CENTRONIC IBM 25W
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 17 1
12 PAPER END 12 \ 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 /
14,16 0V (AUTO FEED?) 14 36 18
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 And Outputting Data to &
from the PC. Not all bits are settable so you will have to read the ports and
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 dissable 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.
73 De John, G8MNY @ GB7CIP
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