Apple IIe - Page 265

The
System
Monitor
265
Entering Subsequent
Program
Lines
The assembler
is
now
ready
to
accept
another
program
line.
To
enter
the
next
instruction
in
the
next
consectutive
memory
location,
enter
a
blank
space
followed
by
the
next
instruction.
Be
sure
to
include
the
space
as
it
is
important.
The
following
is
an
example
of
the
correct
syntax
for
the
entry
of
a subsequent
program
lines.
!
JMP
300
0303-
4C
00
03
JMP $0300
If
any
errors
are
encountered
in
an
input
line,
the
assembler
will
cause
the
speaker
to
beep
and
will
display
an
arrow
(
\)beneath
the
offending
character.
A second
error
can
occur
if
a
branch
instruction
is
attempted
in
a
program
of
more
than
FF
16
bytes.
Returning to the
Monitor
Suppose
the
assembler
was
in
use and
the
programme
r wished
to
return
to
the
monitor.
This can
be
accomplished
by
prefixing
the
monitor
command
(FF69G)
with
the$
character
as
shown
in
the
following
example.
!$FF69G
When
$ prefixes a
monitor
command
while
the
assembler
is
active, this
monitor
,
is
executed.
The
FF69G
mon
i
tor
command
executes a
jump
to
the
monitor's
starting
locat
i
on
.
The$
is
not
limited
to
usage
with
only
FF69G
.
lt
can be used
with
any
monitor
command.
Converting Assembly Language Hex Codes
Back
into
Mneu-
monics
The
monitor
includes
a list
command
which
allows
the
pro-
grammer
to
convert
hex data
in
memory
back
into
mneumonics.
When
the
following
command
is
entered: