Chapter 3

Hardware

Parallel Port

Parallel port supports standard parallel, Bi-directional, ECP and EPP protocols. The Super I/O (W83627HG) chip provides the parallel port interface signals.

The Parallel interface shares signal lines with the Floppy interface. The BIOS settings determine which one is operational.

Supports Standard Printer Port (SPP), Enhanced Parallel Port (EPP) and Enhanced Capabilities Port (ECP)

AStandard Parallel port cable pin-out is listed in Table 3-17 for reference along with the J3 connector pins. A DB25 connector can be located on the custom baseboard if desired.

Table 3-17. Simplified Parallel Interface (SPP) Pin/Signal Descriptions (J3)

J3

Signal

DB25

Description

Pin #

 

Pin #

 

51

LPT/FLPY*

NC

Parallel/Floppy Select – This input signal selects the parallel or

 

 

 

floppy port signal. If this signal is Low at boot time, the floppy

 

 

 

drive is selected. If signal is High at boot time, the parallel port is

 

 

 

selected. This state can not be changed until the next boot cycle.

55

Strobe*

1

Strobe* – This output signal is used to strobe data into the printer.

 

 

 

I/O pin in ECP/EPP mode.

80

PD0

2

Parallel Port Data 0 – This signal (0 to 7) provides a parallel port

 

 

 

data signal and is the LSB of printer data.

78

PD1

3

Parallel Port Data 1 – Refer to pin-2 and 9 for more information.

 

 

 

 

76

PD2

4

Parallel Port Data 2 – Refer to pin-2 and 9for more information.

 

 

 

 

74

PD3

5

Parallel Port Data 3 – Refer to pin-2 and 9for more information.

 

 

 

 

72

PD4

6

Parallel Port Data 4 – Refer to pin-2 and 9for more information.

 

 

 

 

68

PD5

7

Parallel Port Data 5 – Refer to pin-2 and 9for more information.

 

 

 

 

62

PD6

8

Parallel Port Data 6 – Refer to pin-2 and 9for more information.

 

 

 

 

58

PD7

9

Parallel Port Data 7 – This signal provides a parallel port data signal

 

 

 

and is the MSB of printer data.

84

ACK*

10

Acknowledge * – This is a status input signal from the printer. A Low

 

 

 

State indicates it has received the data and is ready to accept new data.

86

BUSY

11

Busy – This is a status input signal from the printer. A high state

 

 

 

indicates the printer is not ready to accept data.

88

PE

12

Paper End – This is a status input signal from the printer. A high

 

 

 

state indicates it is out of paper.

90

SLCT

13

Select – This is a status output signal from the printer. A high state

 

 

 

indicates it is selected and powered on.

56

AFD*

14

Auto Feed * – This is a output signal from the printer to

 

 

 

automatically feed one line after each line is printed.

60

ERR*

15

Error – This is a status output signal from the printer. A low state

 

 

 

indicates an error condition on the printer.

64

INIT*

16

Initialize * – This signal initializes the printer. Output in standard

 

 

 

mode, I/O in ECP/EPP mode.

70

SLCTIN

17

Select In – This output signal is used to select the printer. I/O pin in

 

 

 

ECP/EPP mode.

66

GND

18-25

Ground

 

 

 

 

Notes: The shaded area denotes power or ground. The signals marked with * indicate active low.

36

Reference Manual

XTX 820

Page 42
Image 42
Ampro Corporation XTX 820 manual Parallel Port, Signal DB25 Description Pin #

XTX 820 specifications

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