Radio Shack TRS-80 Trsdos & Disk Basic Reference Manual page 45

TRSDOS Commands
Command
Entry
Required
Operation Performed
Rrptydddd
<SPACE>
Loads
register pair rp
with
the
value
dddd.
rp
may
be any
register pair:
AF,
BC,
AF',
BC,
IX, IY, PC,
etc.
S
none
Sets display to
full
screen
memory
mode, showing 256
contiguous
bytes. Press
X
to
return to register display format.
U
none
Dynamic
display
update
mode:
lets
you
observe the execution
of
a
foreground
task.
Hold
down
any key
for a
couple of seconds
to exit
this
mode.
X
none
Sets display to register
format;
also
cancels
any
command
you
are
in
the process of
entering,
except
R-command.
;
none Increments
memory
display
by
one
page
(in
register display
mode,
page =
64
bytes;
page
=
256
bytes
in full
screen
mode).
—
none Decrements
memory
addresses
displayed
by one
page.
Note:
You
cannot use the backspace
key
(
«-
)
to delete
mistakes
made
while entering
commands.
Instead, just
hit
the
X
key
to
cancel the
command.
Or,
if
you
made
the error
while typing an
address or value, just
type the correct address
immediately
after
the incorrect address.
DEBUG
will
only look
at
the
last
four
digits
entered.
For
example,
D474680
< SPACE >
tells
DEBUG
to display the
page of
memory
containing address
4080.
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