Radio Shack TRS-80 Owner's Manual page 174

Appendix
A
/
Tips
On
Loading
Disk basic
There
are several
ways
to start
up Disk
BASIC.
For
instance:
Bm^h urogram
-rltles m. address
i--~i.
!:
:
:
'.-.
^u.^it-
e^y^;*.:^
... ;Y>,:;
y^
:
;'.
ik^-d
S
A^
• -If
r;7^V^i^^Wi*|;
•;":',;;;'.
Y;.-
>V.7>
:
\V
^Sy-Y^y^yO,
>/;Y
:
./^.vYY
;::;•
;;
,V -.
w\
;-Y:Y!
:
C-YI-P.
(V: :Y'-:
:
V'il
;V>i-
>
open
at
ejrie
time,
flleu
is
a
number
front
to
15,
Tills
is
-^v.-*
vi-'-i
'YS
;
s^Y'ii Ys?;Yr;;
i.
sKji
f/^j; s.hestMifc
fi/es wis!
be Fixed
length.
••:.-;.•;-
Y
;.'.-'
:
Y.-'Y.t*Y
"
:
',.
;,:y -;-Y^.
;•£>.•;.
vt'";^
i;
-Y
{
Y.-
memory
up
to
Top
If
all
options
are
omitted
,
Disk BASIC
will
prompt
with
HOW MANY FILES?
and
MEMORY?
The
options allow
you
to
specify any
or
all
of the following:
•
A
program
to
run
after
Disk BASIC
is
started.
•
The
maximum
number
of data
files
that
may
be
Open
at
one
time.
The
larger the
number
of
files,
the less
area available
for storing
and
executing
your programs.
(Note:
Each
Fixed
length
file
takes
up 360
bytes
and each
Variable length
file
takes
up
6
1
6 bytes of
memory
.
•
The
highest address
to
be used by Disk BASIC
during
program
execution
.
Omit
this
unless you
are
going
to call
machine-language
subroutines.
Examples
Under TRSDOS READY,
if
you
type:
BASIC
(ENTER)
,
Disk BASIC
will enter the
command mode
once you answer
the
files
and
memory
prompts
BASIC
-F:
1
CiilM), Disk BASIC
will
Open
one
fixed length
file
and
protect
no memory.
BASIC
- M
:
32000
(HTH),
Disk BASIC
will
Open
three fixed length
files
and
will
use
memory
no
higher than 32000.
BASIC PAYROLL
-F
:
3M
dRQH), Disk BASIC
will start-up, then load and
run
the
BASIC program
called
PAYROLL;
three variable length
files
can be
Opened, and BASIC
can use
all
available
memory.
Note:
If
you
PATCH
Disk BASIC
to
prompt you
for cassette speed
when
you
enter
Disk BASIC
,
you
wil
1
still
be
prompted
with C A S S ? no
matter
which
option you
use.
158