All and more about Sharp PC-1500 at http:f/www.PC-1500.info
6. The CHAIN Statement
CHAIN is a program instru
ct
i
on
;
it
can
only
be used wi
th
in a program, h cann
ot
be used
manually like
CSA
VE, CLOAO, and MERGE. The CHAIN statement a!lows y
ou
to
run a program
that
is
t
oo
large
to
fi
t into memory
all
at
once.
Such large pro9rams must be divided
up
into
scc1ion
s
v-,1ith
a CHAIN stat
emen
t at
the
end
of
eac
h
sect
ion. Th
ese
sectio
ns
ca
n be
saved
on
1ape
will>
CSAVE.
For
ex
ample, le
t'
s assume
you
have t
hr
ee
prog
ram sections named PR
OG
l , PROG2, PROG3.
Each
of
these
section
s ends
with
a C
HA
IN
st
at
e-
merit.
"PROGl "
10 :
20
:
1000
: CHA
IN
1
000
: CHAIN "
PROG2",
1010
"PR
OG2"
'--->
1010
:
.
.
.
.
r-1
2000: CHAIN
2000
:
CHA
IN
"PROG3'
20
10
"PROG
3"
y
2010:
.
4000:
ENO
During
ex
e
cu
ti
on. when the computer encounters
the
CHAIN
st
at
ement. the next
sec
tion is
called i
nt
o
mem
ory
and
ex
ecuted
.
In
th
is manner, all
of
the
sections are eventually run.
11
3
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