Radio Shack TRS-80 Owner's Manual page 54

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DiSK
SYSTEM
Its
features include:
• Full-
or half-screen displays of
memory
contents
•
Commands
for
modifications
to
ram
and
register
contents
•
Single-step execution of
programs
•
Breakpoint
interruption
of
program
execution
•
Transfer of control
(Jump)
•
"Editing" of
disk-files
debug
uses
the
memory
area
from
x'4E00'
to X'54FF' (see
trsdos
Memory
Map), debug
can only be used on programs
in the
user area
x'550(r to
top.
Examples
DEBUG
Turns
debug
on.
Press 2D
to
quit
debugging and
return
to
trsdos.
Turns
debug
off.
Command
Description
Debug commands
are
usually entered by
pressing
a
single key.
In
most
cases,
you do
not have
to
press (ENTER) after the
command
has been
typed
in.
Either
a
prompt
will
immediately be
displayed or
debug
will
execute
the
operation
without
further instruction.
In
some
cases,
you
will
have
to enter
a specific
hexadecimal
value or address
(see
R and
j
commands,
for instance). Instead of pressing
(ENTER)
after
the
address
is
typed
in,
you
will
have
to
press (SPACEBAR
).
Once you have
entered the
debug
program, you
may
use any of
the
following
special
commands:
D
(Display
Memory
Contents)
Press
©
to
display
the
contents of
memory, trsdos
will
respond with
the
prompt:
D
ADDRESS
=
You
should type
in the
hexadecimal
address of
the
memory
location
you wish
to see.
The
display
will
be
either half-
or
full-screen,
depending on
the
format you
are
currently using
(see
below).
38