User Guide

Pin Assignments
B-2 FIC A985 Service Manual
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 o
f 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 p
arallel 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 r
egister 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 al
lows current to flow
through the write head.
It become active just prior to writing to the diskette.
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