2.11
Monitor
Function
The IOCS section
of
the
BASIC Interpreter includes a
monitor
program
to
make
it
easy
to
enter
machine language programs. This
monitor
program uses the area from
FFOOH
to
FFFFH
as
a stack area.
This
monitor
program includes the screen editor similar to
that
of
BASIC which makes
it
possible
to
change
the
contents
of
any address within
the
64K RAM area
as
described below.
2.11.1
Editing format
:address=
data
data
data
: (colon) Indicates
that
the
line following can be edited.
address Indicates
the
starting address
of
the
memory area whose contents can be changed.
( 4 hexadecimal digits)
data
Separates data from
the
address.
2-digit hexadecimal
number
or
a semicolon " ; " plus the character which is written in
the
specified address. A blank is used
to
separate adjacent data items.
2.11.2 Printer switching command
..........................................
(P command)
I Format I * P
This command switches data
output
with the D
or
F command between the printer and display.
If
tbe
printer
is
not
connected to
the
computer, the message
"ERR?
" is displayed and the
monitor
stands by
for
input
of
another
command. Check
the
printer connection
or
execute the P command again
to
switch
the
output
device
to
the
display.
2.11.3 Dump command
...................................................................
(D command)
I Format I * D
<start
address <
LJ
end
address>>
This command dumps
the
contents
of
memory from the starting address
to
the end address.
If
the end
address
is
omitted,
the
contents
of
the 128-byte block starting at
the
specified address are dumped.
If
both
addresses are omitted,
it
dumps
the
contents
of
the
128-byte block following
memory
block previously
dumped.
The format in which data is dumped is as follows.
:
HHHH=HH
LJ
HHLJHH
HH HH HH
HH
HH
/
ABCDE.
G.
i
Starting adress
8 bytes (Hexadecimal code)
8 bytes (Characters)
The
contents
of
any location can be changed
by
moving the cursor
to
the corresponding byte, entering
the new data, and pressing
the
I
CRI
key.
Note Control codes are displayed as a period
(.
) in the character data field. Pressing
the
I
BREAK
I key
stops
dump
output
,
and
pressing the I SHIFT I and I
BREAK
I keys simultaneously returns the
monitor
to
the
command
input
mode.
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