Ampro Corporation XTX 820 ユーザーズマニュアル
Chapter 3
Hardware
XTX 820
Reference Manual
45
Pin #
Signal
Description
80
PD0
INDEX*
Parallel Port Data 0 – This pin (0 to 7) provides a parallel port data signal
and is the printer data LSB.
and is the printer data LSB.
Floppy Index –Detects when the head is positioned over the beginning of the
track.
track.
81, 82
VCC
DC Power – +5V +/- 5%
83
RXD1
Receive Data 1 – Serial port 1 receive data in.
84
ACK*
DRV*
Parallel 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.
Low State indicates it has received the data and is ready to accept new data.
Floppy Drive Select 1 – This signal selects drive 1.
85
RTS1*
Request To Send 1 – Indicates Serial port 1 is ready to transmit data. Used
as hardware handshake with CTS1 for low level flow control.
as hardware handshake with CTS1 for low level flow control.
86
BUSY
MOT*
Parallel Busy – This is a status input signal from the printer. A high state
indicates the printer is not ready to accept data.
indicates the printer is not ready to accept data.
Floppy Motor Control 1 – This signal selects motor on drive 1.
87
DTR1*
Data Terminal Ready 1 – Indicates Serial port 1 is powered, initialized, and
ready. Used as hardware handshake with DSR1 for overall readiness.
ready. Used as hardware handshake with DSR1 for overall readiness.
88
PE
WDATA*
Parallel Paper End – This is a status input signal from the printer. A high
state indicates it is out of paper.
state indicates it is out of paper.
Floppy Write Data – Encoded data to the drive for write operations.
89
DCD1*
Data Carrier Detect 1 – Indicates external serial device is detecting a carrier
signal (i.e., a communication channel is currently open). In direct connect
environments, this input is driven by DTR1 as part of the DTR1/DSR1
handshake.
signal (i.e., a communication channel is currently open). In direct connect
environments, this input is driven by DTR1 as part of the DTR1/DSR1
handshake.
90
SLCT*
WGATE*
Parallel Select – This is a status output signal from the printer. A high state
indicates it is selected and powered on.
indicates it is selected and powered on.
Floppy Write Gate – Signals drive to enable current flow in the write head.
91
DSR1*
Data Set Ready 1 – Indicates external serial device is powered, initialized,
and ready. Used as hardware handshake with DTR1 for overall readiness.
and ready. Used as hardware handshake with DTR1 for overall readiness.
92
MSCLK
Mouse Clock – This signal clocks the data from the mouse.
93
CTS1*
Clear To Send 1 – Indicates external serial device is ready to receive data.
Used as hardware handshake with RTS1 for low level flow control.
Used as hardware handshake with RTS1 for low level flow control.
94
MSDAT
Mouse Data – This signal provides the mouse data.
95
TXD1
Transmit Data 1 – Serial port 1 transmit data out
96
KBCLK
Keyboard Clock – This signal clocks the data from the keyboard.
97
RI1*
Ring Indicator 1 – Indicates external serial device is detecting a ring
condition. Used by software to initiate operations to answer and open the
communications channel.
condition. Used by software to initiate operations to answer and open the
communications channel.
98
KBDAT
Keyboard Data – This signal provides the keyboard data
99
GND
Ground
100
GND
Ground
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.