Radio Shack TRS-80 model III Owner's Manual page 46

TRSDOS
X
(Half-Screen Display)
Press
®
to
put the
Display
in
the half-screen format.
A
128-byte block of
memory
will
be displayed starting
with the
next lowest address
which
is
a factor
of 16.
Figure 9
shows
a typical
half-screen format.
S
(Full-Screen Display)
Press
®
to
display the contents of a
256-byte block of
memory
starting
with
the
next lowest address
which
is
a factor
of 256.
Note:
The
last
16 bytes
on
the
Display will
be overlaid
by any
command
line
typed in after
the full-screen display
is
updated.
M
(Modify
RAM)
Press
ffi)
to
change
to
the disk
utility
display
format (see the f
command).
trsdos
will
respond with
the
prompt: M
ADDRESS
-
You
should type
in
the
four-digit
hexadecimal
address of
the
memory
location
you
wish
to
modify,
followed
by
a
blank space (anything
other than
a
space will abort the
command).
The
display will
change
to the
memory
edit
format.
The
cursor
will
appear
as
a
blinking character
at
the specified location.
To
exit
the
modify mode,
press
CENTER) to
keep
all
changes made.
R
(Change Register Contents)
Type:
feadfticj
zeros are
assumed.
I
(Instruction Single-Step)
Pressing
CD
will
allow
the
Computer
to
execute a single
z
80
instruction.
The
display will
then
be updated.
39