Specifications
System B
Installation,
Use,
and
Maintenance Manual
If
it
is
a
Sprint
3
printer
from
Vector
Graphic,
but
not
part
of
a System
B+S3
from
the
factory,
connect
the
printer
as
described
in
the
instructions
that
come
wi
th
the
pr
inter.
If
it
is
one
of
the
above
kinds
of
printers,
remove
the
cover
of
the
computer
and check
that
the
baud
rate
setting
of
Serial
Channel
C
of
the
Bitstreamer
II
board
matches
the
speed
of
the
printer.
Find
the
Serial
Channel C
swi
tch
near
the
upper
left
hand
corner
of
the
board,
press
the
desired
rocker
down
and away from
the
OPEN
designation,
and
press
all
other
rockers
in
the
opposite
direction.
A
Sprint
3
always
operates
at
1200
baud.
'!he
system
does
NOT
have
to
be
turned
off
during
this
procedure.
If
it
is
a
Centronic's
parallel
printer,
contact
Vector
Graphic
for
instructions
on
interfacing.
If
it
is
a
TI
810
printer
and
you
want
to
operate
it
at
1200
baud,
determine
if
it
will
be
used
to
print
word-processing
text,
long
program
listings,
or
any
kind
of
output
\Itlich
is
dunped
directly
and
continuously
from
memory,
with
no
breaks
for
disk
access
or
calculation.
If
so,
an
additional
hardware
modification
to
the
system
is
required.
This
modification
is
not
necessary
if
the
printer
is
used
for
normal
data-processing
output.
'!he
modification
is
as
follows:
Remove
the
Bitstreamer
II
board
from
the
computer.
Find
pin
11
of
the
RS-232C
connector
on
the
backplane
of
the
computer
chassis.
Solder
one
end
of
a
wire
to
this
pin
(on
the
inside
of
the
computer) and
the
other
end
to
pin
1
of
chip
U26
on
the
Bitstreamer
II
board.
Then
solder
one
end
of
a
short
jumper
wire
to
pin
3
of
U26
and
the
other
end
to
pad 1
of
jumper
area
N.
Jumper
area
N
is
near
the
bottom
right
side
of
the
board.
Finally,
look
at
the
back
side
of
the
board
and
find
the
trace
which
leads
downward
from
pad
1
of
jumper
area
N.
This
trace
narrows
down
just
below
the
pad.
Using a
sharp
knife,
cut
this
trace
through
the
narrow
part,
scraping
the
trace
on
each
side
of
the
cut
so
that
the
connection
is
thoroughly
cut.
'!hen,
return
the
board
to
the
system.
Having
made
this
modification,
you
can
carurunicate
to
the
printer
at
9600
baud,
which
will
speed
up
throUJhput
by
about
25%.
Set
both
Serial
Channel C and
the
printer
to
9600
baud.
If
you
are
using
a
kind
of
printer
not
mentioned
above,
refer
to
both
the
printer's
manual and
the
Bitstreamer
II
manual
for
the
infoonation
you
will
need
to
connect
it,
but
Vector
Graphic
does
not
take
responsibility
for
supp:>rting
this
interface
or
its
consequences.
You
may now
return
the
cover
of
the
computer,
again
making
sure
the
slotted
edge
is
on
the
same
side
as
the
slotted
side
of
the
chassis.
Unless
you
plan
further
hardware
modifications
(such
as
required
by
the
Meroorite
\1iOrd
processing
software),
you
may
screw
the
cover
down.
Refer
to
the
printer's
manual
for
how
to
load
ribbon,
paper,
printwheel,
how
to
connect
it
to
p:>wer,
and
how
to
turn
it
on.
(Instructions
for
connecting
and
turning
on
the
Sprint
3
in
a System
B+53
are
found
in
Section
2.2
below.)
Rev. A
1/17/88
2-5