Radio Shack TRS-80 Trsdos & Disk Basic Reference Manual page 46

TRSDOS Commands
More
on
the
M-command
(modify
memory)
Any
time
you
wish to alter
the contents of
a
memory
location,
type
Maaaa and
press
the
<
SPACE>
.
This
sets
the
memory
modification
address to aaaa
and puts
a
memory
modification
prompt
in
the
lower
left
corner of the Display.
For example, typing
M7F06
<
SPACE
>
produces:
7F88 =>
7F88- 7F16 =>
28-_
7F20
=>
7F38
=>
1201180
00 00 80 80 32 B2
B3 63 B3 EG EG B3 EG EG
FB BB BB BB BB FB FB BB
88 FB FF FB FF FB FF FF
28 B3 B3 B3 B3
b:
BB B3 BB EG BB B3 BB BB
08 FB FB FB FB FB FB FB
00 FF FF FF
FF FF FF FF.
Note
the vertical
bars
around
the value of
7F00; These
will
appear
wherever
the modification address appears
on
the
screen.
To
modify
the contents
of
7F00,
type the
new, two-digit
contents
and
press
<
SPACE
>.
The
display will
then be updated, and
DEBUG
will
increment
the modification address
by
one.
To
leave
an
address contents
unchanged, simply press
<
SPACE >
without
first
entering
a
new
contents.
This will
increment the
modification address
and
leave
the previous address
unchanged.
To
exit
the
modify
memory
mode, type
X
or
UflM*H
.
If
you
simply type:
M
<
SPACE >
DEBUG
will
default to the
last
specified
modification
address, if
any:
otherwise
0000
will
be
used.
Frequently,
two
values
on
the display will
be highlighted
by
vertical
bars
-
one
in
the
64-byte
memory
display
area,
and another
in
the
indirect
memory
area associated
with the
register pairs.
This
is
because
the contents of the modification address
happens
to
be displayed twice,
one
directly,
one
indirectly.
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