Radio Shack TRS-80 Owner's Manual page 56

r
i§k&
Start
address
of
one
16-byte
"row"
of
RAM
RAM
display
—
(
hex
contents
' of
each byte
ASCii display
(•
indicates a
nondisplayable
character)
Z-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,
U
(Update)
Pressing
3D
causes
the
Display
to
be updated
repeatedly. Press
any key
to exit
from
this
mode.
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