Connecting
the
Terminal
In
order to
connect
a
terminal to
the
MicroLab
|,
perform
the
following procedure:
1.
Connect
the
terminal to
the
MicroLab
|
RS-232-C
port.
2.
Set
the
MicroLab
|
baud
rate
by
moving
jumper
J1070
(if
you're
a
qualified
service
person,
see
Section
4 to
set
jumper J1070),
or;
3.
Set the terminal
baud
rate
to match
the
MicroLab
|
baud
rate.
4.
Turn on
the
MicroLab
|
and
the
terminal.
The Terminal
!/O
Locations
The
MicroLabl
uses
Motorola
6850 asynchronous
communications interface adapters
(ACIAs)
for
serial
communications. The
I/O
locations
for
the terminal
port
ACIA
are personality card-dependent.
For
the 8085
Personality
Card,
the
terminal port
is
located at
1/O
addresses 0084 and 0085.
Location
0085
is
the data
address.
Location
0084
is
the
port
status
address. The
Instruction
Manual
Supplement
for
your
particular
personality card lists
these
I/O
addresses
The terminal
port
status
byte
is
arranged
in
the
following
configuration:
2827-6
Fig.
2-4.
The
MicroLab
|
Terminal Port
Status
Byte.
The
status
bits
are read as
follows:
IRQ
interrupt request
PE
parity error
OVRN
overrun
FE:
framing
error
cTS
clear-to-send
is
low (the
ACIA will
not
transmit
unless
CTS
is
high)
DCD
__
data-carrier-detect
is
low
TDRE
the transmit data register
(TDRE)
is
empty
RDRE
the
receive
data register
is
empty
jarization—MicroLab
|
Instruction
See
the
Motorola Microcomputer Data
Library for
more
information
concerning the operation
of
the 6850
ACIA.
The Terminal
Port Connector
The following
is a
list of
terminal
port
connector
pin
assignments.
Your
terminal
must
make
use
of
the
same
pin
configuration.
Table 2-2
The
RS-232-C
Port
Connector
Configur:
Pi
Use
Protective
Chassis
Ground
EIA
Transmitted
Data
(to
RXDATA
on
ACIA)
EIA
Received Data
(to
TXDATA
on
ACIA)
EIA
Request
To
Send
(to
CTS
on
ACIA)
EIA
Clear
To
Send
(to
RTS
on
ACIA)
EIA
Data
Set
Ready
Signal Ground
EIA
Data Carrier Detect
20
|
EIA
Data
Terminal
Ready
All
other
pins
are
not
used.
1
2
3
4
5
6
7
8
Using
The
RS-232-C
MODEM
Port
The lower 25-pin connector
shown
in
Fig.
2-3
is
a
spare
RS-232-C compatible
port.
This
port
is
not
supported
by
the
MicroLab
|
firmware,
but may be
accessed
by
a
routine
you
can
write. The I/O
address
of
the
spare
port
is
personality
card-dependent. The
spare
port
is
located at
|/O
addresses
O0X8
(control/status)
and
OOX9
(data).
The
X
varies with
each
personality
card.
See the supplement
for your
personality
card.
The
spare
RS-232-C
port
is
controlled
by a
Motorola
6850
ACIA.
Location
OOX9
is
the
data
read/write
address,
and
location
OOX8
is
the
ACIA
control address. One note
on
using
this
port
—
if
the
incoming
CTS
line
is
not
high,
the
ACIA
will
not
transmit
data. The
spare
port connector
pins
are
wired
in
the same
manner
as
the
terminal
port.
The
spare
port
status
byte
is
configured
in
the same
way
as
the
terminal
port
status
byte.
29
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