Radio Shack TRS-80 Owner's Manual page 111

Enhancements
to
Model HI
BASIC
Disk basic adds
many
features
which
are
not disk-related.
They
are listed
below
along with abbreviated descriptions.
Detailed descriptions follow
in
alphabetical
order.
&H
&o
Abbreviations
CMD"A"
CMD"B"
CMD"C"
CMD"D"
CMD"E"
CMD'T'
CMD'T
CMD"L"
CMD"0"
CMD'T"
CMD"R"
CMD"S"
CMD'T"
CMD"X"
CMD"Z"
DEFFN
DEF USR
INSTR
LINE INPUT
MID$
=
NAME
usRn
Hexadecimal-constant
prefix
Octal-constant prefix
Many commands
have
abbreviations
Return
to
trsdos
with
error
message
Enable/Disable
(BREAK)
Delete spaces
and remarks from
a
program
(compression)
Display directory for specified drive
Display previous
trsdos
error
Return
a
command
to
trsdos
Convert calendar date
Load
z-80
subroutine
or
program
file
into
ram
Alphabetizes
(sorts)
a string
array only
Check
printer status
Start
real-time
clock display
Normal
return
to
trsdos (jump
to
exit routine)
Turn
off real-time
clock display
Cross-reference of reserved words,
string
variables, or
strings in
a
program
Duplicate output
to
Display and
Printer
Define BASic-statement function
Define
the
entry point
for
an
external
machine-language
routine
Instring function; find the substring in the target string
Input a
line
from keyboard
Replace portion
of
the target string
(used
on
left
of equals
sign)
Renumber
a
program
in
ram
Call external routine (n
=
0,l,2,
. . .
,9)
&H
and
&O
(hex
and
octal
constants)
Often
it is
convenient
to
use
hexadecimal
(base
16) or octal (base
8)
constants
rather
than
their
decimal counterparts.
For example,
memory
addresses
and
byte
values are easier
to
manipulate
in
hex
form.
&H
and
&o
let
you
introduce such
constants
into
your program.
&H
and
&o
are
used as prefixes for the
numerals
that
immediately follow them:
93