Specifications
Table 2-15.
V40
Serial Port Connections (J2)
J2
SIGNAL
FUNCTION
IN/OUT
OB2S
OB9
Pin
NAME
PIN
PIN
1
RXD
Receive
Data
in 3 2
2
RTS
Henclshake
OUt
out
4
7
3
TXD
Transmit
Data
out 2 3
4
CTS
Henclshake
In
in 5
8
5
OTR
EIA
True
out
20
4
6
GND
S i
11M
l
GrOWlCi
---
7
5
V40
Serial Port Jumperlng
The only jumper option pertaining to the board's V40 serial port is the selection
of
the source
of
the Handshake Out signal (RTS). W47. a 3 pin jumper group. allows the Handshake
Out
signal
to
be
driven by either the V40's serial controller handshake
output
logic.
or
by
the
printer interface's -INIT signal.
As shipped from the factory. this signal
is connected to the handshake
signal.
(SRDY; V40 pin
36)
generated
by the serial controller within the V40 microprocessor.
As
utilized
by
the
ROM-BIOS. the V40's handshake signal automatically goes true when the receive buffer is
ready
to
receive data.
and
false when the receive buffer is full.
Alternatively. the Handshake
Out
signal source
can
be
jumpered
to
the
printer
port
-INIT
signal. This provides a signal source which
is
completely under software control. but is only
useful
if
the printer port
will
not
be
used.
or
if
the applications running
on
the board will not
use
the -INIT signal when
using
the printer port. .
To
select the V40's handshake output logic. insert a shorting block between W47 pins 1 and
2;
to use the printer -INIT signal. short pins 2
and
3. The default is normall""Yi'ii
V4O's
hand-
shake output
signal.
2.4.6
Floppy
Disk Interface -
J8
The board's floppy disk controller subsystem
and
ROM-BIOS support one
or
two floppy disk
drives
in
any
of
the standard DOS formats shown in Table 2-16.
2-16