Solutions for Specific Systems
The next s
u
bsec
ti
o
n
s
illustr
a
te dealing with interface probl
ems on
seve
r
al types
of computer
s
.
A
pple
s
o
f
t B
A
SIC solutions
App
l
esoft
B
A
SIC does not use PRINT to send data to th
e screen
a
n
d LP
R
INT
to
s
end data to the printer as MicroSoft BASI
C does.
Yo
u
have
t
o is
sue the command PR#l to switch the printer
o
n
and
PR#O to switc
h it off.
If one of the p
ro
g
ram
s
in thi
s
manu
a
l contain
s
an INPUT
s
t
atement
or a PRINT sta
t
e
m
e
nt
,
ther
e
will be a message that should
go
t
o the
screen before a
n
y
thing i
s se
nt to the printer
.
In the
s
e pr
ograms
,
leave the first
lin
es
a
s
the
y a
re and after the INPUT
a
nd
/
or PR
INT
statements, ad
d
a
lin
e
that
s
tat
es
PR#1
.
Th
e
n ch
a
ng
e
all
t
h
e inst-
ances of LPR
INT to PRINT
a
nd put a line that states PR#
O at the
end of the prog
r
a
m
.
A
p
ple I
I
so
lutions
There are two
t
y
p
e
s of probl
e
ms that you who own Appl
e
II
compu-
ters will need
t
o a
ddr
ess.
The fir
s
t i
s
that the Apple II i
s a
n
8-bit
computer, but wor
k
s
m
a
inl
y w
ith 7 bit
s.
Th
e
eighth bit i
s often set
permanently to a
1 (ON)
.
This mean
s
that most printer in
terfaces
only handle 7
bit
s,
bec
a
us
e
of the need to remov
e
the 1 fr
om the
eighth bit
.
T
h
e se
cond type of problem i
s
that the int
e
rfac
e
n
ormally
has its own use
f
o
r ASCII
c
od
e
9
.
The
s
e probl
e
ms r
es
tri
c
t
you in
sending graphi
c
s
d
a
t
a.
Should you nee
d
a
n 8-bit
sys
tem
,
the simplest solution is to pur
c
h
ase
a new printer i
nt
e
rfac
e
card from your computer d
e
aler
.
Such
a card
is available for
th
e
Appl
e
II
.
You can POK
E codes to m
e
mory as discussed above
, y
ou c
a
n
write
your own printer
driver
,
or
y
ou can avoid the typ
e
s of progr
a
m
s that
require eight b
it
s.
A routin
e
to POKE codes to the m
e
m
ory of an
App
l
e II Plus
i
s
given in th
e
POKEing codes subsection.
The Apple II
u
ses
ASCII CODE 9 to
"
initialize
"
the print
er
.
This
code and the fo
ll
ow
ing ch
a
ract
e
r or characters are interc
epted by
the printer inte
rf
ace
c
a
rd
a
nd u
se
d to change modes. For
example,
you can set t
h
e
c
o
lumn width to 80 and simultaneously di
ve
r
t all
output to t
h
e
er
in
s
t
ea
d of to the
s
cre
e
n b
y s
ending th
e fo
l
low-
ing lines:
PR
#
l
PR
I
NT
C
HR$(9) "80N
"
Summary of Contents for LX-80
Page 1: ...LX 80 Printer P8492037 0 Y560991020 ...
Page 2: ...EPSON LX SOPRINTER Operating Manual ...
Page 8: ...The Parallel Interface Data Transfer Sequence Interface timing Signal relationships ...
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