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HP HP-65 - Appendix D Common Errors; Common Errors

HP HP-65
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10.
11.
12,
Appendix
D
Common
Errors
.
Having
unwanted
duplicate
names
(labels)
for
user
defined
functions
in
memory
because
[f
was
not
pressed
in
W/PRGM
mode
before
keying
in
a
program.
.
Inadvertently
erasing
a
program
in
memory
by
inserting
a
magnetic
card
when
W/PRGM-RUN
switch
is
set
to
RUN.
.
Inadvertently
erasing
a
program
on
a
magnetic
card
by
in-
serting
an
unprotected
magnetic
card
when
W/PRGM-RUN
switch
is
set
to
W/PRGM.
.
Keying
unwanted
operations
into
program
memory
because
the
W/PRGM-RUN
switch
is
set
to
W/PRGM
when
keys
are
pressed.
.
Failing
to
shift
up
to
a
gold
function
(
[fl
or
)
or
down
to
a
blue
function
([8])
because
prefix
key
was
omitted.
.
Losing
the
T-register
contents
because
the entry
of
a
new
number
or the
recall
of
a
register
lifts
the
stack.
.
Destroying
the
contents
of
register
R,
because
a
trigono-
metric
function,
a
relational
test,
or the
rectangular-polar
conversion
was
done.
.
Failing
to
take
account
of
a
merged
code
and
to
provide
a
NOP
as
filler in
a two-step
skip.
.
Performing
a
trigonometric
function
in
the
wrong
angular
mode.
Mistakenly
trying
to
call
user
defined
functions
labelled
(o],
...,[e].oniy.
...,B
can
be
used
to
label
or
call
de-
fined functions.
Forgetting
to
clear
flags
before
using
them.
Expecting,
stack,
or
registers
to
remain
unchanged
after
calling
a
user
defined
function
from
the
keyboard
(letters
“
e,
E)
or
within
a
program.
95

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