Pin Assignments

B.3 Parallel Port Connector

The pin assignment of the parallel/printer (LPT1) port connector is as follows:

No

PIN ASSIGMENT(by: sort)

Description

1

STB#/DS0#_D14/_P14/_D12:O

An active low pulse on this output is used to strobe the

 

 

printer data into the printer.

 

 

The STROBE output is the complement of Bit 0 of the

 

 

printer control register.

 

 

Refer to parallel port description for use of this pin in ECP

 

 

and EPP mode.

 

 

Active low outputs select driver 0

2

PD0/INDEX3#_P14/_S:IO/I

Port data 0

 

 

This active low Schmidt trigger input senses from the disk

 

 

drive that the head is positioned over the beginning of a

 

 

track as marked by an index hole.

3

PD1/TRK0#_P14/_S:IO/I

Port data 1

 

 

This active low Schmidt trigger input senses from the disk

 

 

drive that the head is positioned over the outermost track.

4

PD2/WRTPRT#_P14/_S:IO/I

Port data 2

 

 

This active low Schmidt trigger input senses from the disk

 

 

drive that a disk is write protected.

 

 

Any write command is ignored.

5

PD3/RDATA#_P14/_S:IO/I

Port data 3

 

 

Raw serial bit stream from the disk drive, low active.

 

 

Each falling edge represents a flux transition of the

 

 

encoded data.

6

PD4/DSKCHG_P14/_S:IO/I

Port data 4

 

 

This input senses that the driver door is open or that the

 

 

diskette has possibly been changed since the last drive

 

 

selection.

7

PD5_P14:IO

Port data 5

8

PD6/MTR0#_P14/_D12:IO/O

Port data 6

 

 

This active low outputs select motor drives 0.

9

PD7_P14:IO

Port data 7

10

ACK#/DS1#_T_D12:I/O

A low active output from the printer indicating that it has

 

 

received the data and is ready to accept new data.

 

 

Bit 6 of the printer status register reads the ACK# Input.

 

 

Refer to parallel port description for use of this pin in ECP

 

 

and EPP mode.

11

BUSY/MRT1#_T/_D12:_I/O

This is a status output from the printer, a high indicating

 

 

that the printer is not ready to receive new data.

 

 

Bit 7 of the Printer status register is the complement Of

 

 

the BUSY input. Refer to parallel port description for use

 

 

of this pin in ECP and EPP mode.

 

 

This active low outputs select motor Drives 1.

12

PE/WDATA#_T/_D12:I/O

Another status output from the printer, a high indicating

 

 

that printer is out of paper.

 

 

Bit 5 of the printer status register reads the PE input.

 

 

Refer to parallel port description for use of this pin in ECP

 

 

and EPP mode.

 

 

This active low high current driver provide the encoded

 

 

data to the disk drive.

 

 

Each falling edge cause a flux transfer on the media.

13

SLCT/WGATE#_T/_D12:I/O

This high active output from the printer indicates that it

 

 

has power on.

 

 

Bit 4 of the printer status register read the SLCT input.

 

 

Refer to parallel port description for use of this pin in ECP

 

 

and EPP mode.

 

 

This active low high current driver allows current to flow

 

 

through the write head.

 

 

It become active just prior to writing to the diskette.

B-2

FIC M295 / M296 Service Manual

Page 167
Image 167
FIC M296, M295 service manual Parallel Port Connector, PIN ASSIGMENTby sort Description

M296, M295 specifications

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