Tandy 600 Programmer's Reference Manual page 186

INT 5Ah, Function
3
-
Turn
off
Bar
Code Reader
Entry:
AH =
3 (function
code)
Exit:
AL =
Standard
BIOS
error
code
This function
will
be
called to indicate that
access
to
the bar
code
reader
is
complete. This
function
should perform
any necessary clean
up.
INT 5Ah, Function
4
-
Release Bar
Code Reader
Entry:
AH
=
4
(function
code)
Exit:
AL=
Standard
BIOS
error
code
This routine
will
be called at the
end
of
bar
code reader access.
Its
purpose
is
to
mark
the
bar
code reader as not
in
use.
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