122
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5-4-1. Character functions
• Combination
of
character stri
ng
Con
1b
ination of character stri
ng
..
) aind charac(cr stri
ng-2
(!)E
NTRY PREPARATION
• Prepa
ra
ci
on
of
character strings
Character string inf
<>
rrnation of
th
e charact
er
string
-I
is stored
in
th
e arith
lj
ne
li
c
register (7
AOOH
- 7A07 H).
Charact
er
string inf(
>r1na1ion
or t
he
character strin
g-
2 is stored
in
th
e arithtllC
ti
c
regi
ster
(7A
I
OH
- 71
\1
7H).
• 10
11
is stored
in
the string buffer point
er
(
iS
94H).
(~
ENTRY ADDRESS
D925H
• Subroutine is called in the fol1o\ving forn1
a1:
SJ P
(A
ddress where PS H X r
eg
is
wri11
rn)
DB DATA (Error
re
turn addres
s}
PSH Xrcg l
PSH Yrcg Wr
it
e
in
other
add
re
ss
es
.
.IMP 0925
...
..,
.......
--
~
P
SH
Xr
ec
:
:>
JP
- - - ·
P
SH
Yr
eg
1
Data
~~:~:
..
I
:
:_-
-
_~ -~
-
~
:~
,
·-
_
:
~
--
-r
..
,,
l;
t Crrcr -
---
'--
':..
.
-..
HTN
Q)
EXIT STATE
• \Vhcn no
err
or
Ret
urn
s tO t
ht.:
address next to the data.
l~
esu
lt
a n
t
charac1er string
in
forn1atio
1l
'vi
ii
then be stored
in
1hc
ar
ith
me
ti
c register X
(7A
0011
-7
A
07H)
and the combined
chara
cter
st
ri
n
g.~
\\
1
i1l
he stored in
th
e st ring buffer (7
ll
I 0
I-{
......
).
• \\'
hen
err
or
r\
ft
t·r storing the
error
codi.:
in the lJ H rcg
is
t
cr
. il returns to the data stored
addres
s
pl
us
on
e.
NO
TE: Fot details of charac
ter
st
ring
in
fo,
ma
li
on.
'e
fe,
10
lhe par
ng
n1ph discussing the
Stfut lure
of
v~
r
i
ab
le
and
pfog
ra
n
~
.
Do
not sale this
PDF!!!
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