APPENDIX
G / ModelI toModel III Program
ConversionHints
From
a
language
standpoint, Model III
BASIC
is fully compatible with
Modell
Level II
BASIC.
In fact, the
two
BASIC's are identical, except that Model III
BASIC
includes
one
more
function,
TIME$.
However,
because
of
Model
Ill's
many special features not available in
Modell,
there are
some
internal differences which may require that you modify any
Modell
Level II
BASIC
programs
you
may
have.
1.
For
a given
TRS-80
(16K,
32K
or
48K
RAM),
the
amount
of
user
memory
in Model
III is 258 bytes less than the
amount
in
Modell.
2.
To
load a Level II
BASIC
program,
you must select the
Low
(500
baud) cassette
speed
on
your
Model
III.
3.
When
running a Level II
BASIC
program which requires all-capitals keyboard
entries, be sure to select all-caps mode.
(SHIFT)(ID is the
on/off
toggle for
all-caps.
4.
Unlike the
Model
I, Model III lets you interrupt a cassette, line printer,
or
RS-232-C
operation
by
holding
down
the
(BREAK)
key.
Some
of
your
Level
II
programs
may
need
modification to take this feature into account.
5.
The
video display
character
sets are slightly different in Model I and Model III.
Model
III produces standard
ASCII
characters for codes
32
through
127;
Model I
does not.
In
particular, there is no up arrow, down arrow, left arrow
or
right
arrow in the
Model
III
character
set.
However,
Model III has an additional set
of
96
special characters from which you can probably find
whatever
you need.
See
the table
of
Model
III
Character
Codes
for details.
Radio ShackApplications Programs
For
a list
of
which
Modell
programs
will run on Model III and which
won't,
see the
Radio
Shack
Computer
Catalog.
Most
Model I-only programs will be available in
Model
III versions.
Check
at
your
local Radio Shack.
G/1
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