Radio Shack TRS-80 Owner's Manual page 55

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X
(Half-Screen Display)
Press
®
to
put the
Display
in
the half-screen
format.
A
128-byte block 01
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 CD 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:
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bt
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~z
H
\f
v.-8i-
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\n
Derosa pressing
s^rES/^
leading zeros are
assumed.
I
(Instruction Singie-Step)
Pressing
CD will
allow
the
Computer
to
execute
a
single z-80 instruction.
The
display will
then
be updated.
39