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74
PROGRAMMING THE 91008
ERI GA
A
ROM
YBOAR
CONTINUED
PROGRAM OPERATION
J
PRESS:
or
PRESS:
GO TO
(
)(
)
END
+
SWITCH:
PROGRAM
0
0
PRESS:
keys in the program seq uence
Observe that, as each step is entered, the
X
register displays the step address and the key
code; the
Z
register displays the next address
to be used tagether with whatever step is in that
address.
Address the program counter:
SWITCH:
RUN
PRESS:
or
GO TO
(
)(
)
PRESS:
END
Enter data (A and 8):
0
PRESS:
digit
keys
for
A
PRESS:
t
PRESS:
digit
keys
for
8
Run the
program:
PRESS:
CONT
DISPLAY:
Ax8
A+8
A
~
y
8
~X
0
.
To rerun the program, enter data as before and
press CONT. ln th1s program
it
1s not neces-
sary to readdress the program counter each
time, the END 1nstruction automat1cally resets
the counter to (
+
)00.
I
j
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