Radio Shack TRS-80 model III Owner's Manual page 47

TRS-80
MODEL
III
DISK SYSTEM
Start address
of
one
16-byte
"row"
of
RAM
RAM
display
—
A
hex
contents
of
each
byte
2-80
register contents
'
Op-code
Instructions
at the
"PC"
address
Figure
9.
Half-Screen Format.
The
instruction
in the
memory
contents referenced
by
the
program
counter
is
executed. The program
counter
is
increased by
the appropriate value,
and
the
control
is
returned
to
debug.
debug
will not, however,
step through
a
call
or
jump
into a
rom
address.
C
(Call
Single-Step)
If
you wish
to
complete
an
entire call/return
sequence,
press
©.
The
call
is
then executed and
control
is
returned
to
debug when
the subroutine
returns.
Otherwise,
this instruction acts just
like the
I
command.
You
will not be able
to step through
a
call
or
jump
into a
rom
address.
ASCII
display
(•
indicates a
nondisplayable
character)
U
(Update)
Pressing
©
causes
the Display
to
be updated
repeatedly. Press
any key
to
from
this
mode.
exit
40