network
The OL can be connected
with
up
to
63 other
OLs.
It
there
are
more than two computers
on
the
network
then
each computer (or
station)
must be assigned a unique
station
number.
On the OL this can be done
uSing
the
NET
command.
Information
is
transmitted
over
the
network
in
blocks.
For
normal communication between
two stations the receiving station must acknowledge correct reception of the block.
If
a block
is
corrupted then the receiving station
will
request retransmission.
Using a network station number of zero has a
speCial
meaning. Sending
to
nelo_O
is
called broadcasting: any message sent
in
this way can be read
by
any station which
is
listening
to
neli_O.
Note
that
the normal veriticatlon
that
a message
has
been received
is
disabled for broadcasts,
so
that broadcasting messages of length more than one block
(255 bytes)
is
unreliable.
A network station which listens
to
ItS
own station number
(e.g.
NET3:LOAD
neti_3)
can
receive data from any station sending
to
it.
•
Command
NET
OPEN
CLOSE
PRINT
INPUT
INKEY$
LOAD
SAVE
LBYTES
SBYTES
EXEC
SEXEC
LRUN
MRUN
MERGE
Function
assign a network station number
open a network channel
close a network channel
network
I/O
load and save via network
•
34
comment
If
you are planning
to
connect several OLs on the network, or use a long piece of cable,
then you should
wire
it
up with low-capacitance twin core cable, such
as
3
amp
light-flex
or bell
wire.
Take
care
to
connect the centres of each
Jack
to
each
other,
and the outsides
to
each
other.
You
will
find that although the software can handle 63
stations,
the hardware
will not drive more than about 100m of cable, depending on what type
it
is.
If
you are only connecting a few machines with the leads supplied, you need not worry. •
•
12/84
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