Q37309: QB 2.x and 3.00 INT86 Requires VARPTR, but Not 4.00 INT86OLD

Article: Q37309
Product(s): See article
Version(s): 4.00 4.00b 4.50
Operating System(s): MS-DOS
Keyword(s): ENDUSER | B_BasicCom | mspl13_basic
Last Modified: 4-SEP-1990

The interrupt routines INT86OLD and INT86XOLD are meant to emulate the
INT86 and INT86X routines found in earlier versions, but they are
invoked differently, as described in this article.

INT86 and INT86X routines are found only in QuickBASIC versions 2.00,
2.01, and 3.00. The INT86OLD and INT86XOLD are included in Microsoft
QuickBASIC versions 4.00, 4.00b, and 4.50; in Microsoft BASIC Compiler
versions 6.00 and 6.00b for MS-DOS; and in Microsoft BASIC PDS
versions 7.00 and 7.10 for MS-DOS.

In QuickBASIC versions 2.x and 3.00, the offset of the register arrays
must be passed to INT86 and INT86X using the VARPTR function. For
INT86OLD and INT86XOLD (found in later versions), VARPTR is not
required. [This difference is noted on Page 87 in the "Microsoft
QuickBASIC 4.0: BASIC Language Reference" manual for versions 4.00 and
4.00b, and on Page 87 in the Microsoft BASIC Compiler 6.0: BASIC
Language Reference" manual for versions 6.00 and 6.00b.]

This information applies to Microsoft QuickBASIC versions 4.00, 4.00b,
and 4.50 for MS-DOS; to Microsoft BASIC Compiler versions 6.00 and
6.00b for MS-DOS; and to Microsoft BASIC Professional Development
System (PDS) versions 7.00 and 7.10 for MS-DOS.

The newer versions of BASIC listed above have replaced the INT86 and
INT86X statements with the following easier-to-use routines: CALL
INTERRUPT and CALL INTERRUPTX. For more information about these newer
routines, query in this Knowledge Base on the following word:

   QB4INT

The syntax for INT86 and INT86X (used in QuickBASIC versions 2.00,
2.01, and 3.00) is as follows:

   CALL INT86 (int_no, VARPTR(in_array(x)), VARPTR(out_array(y)))
   CALL INT86X (int_no, VARPTR(in_array(x)), VARPTR(out_array(y)))

The syntax for INT86OLD and INT86XOLD (used in later versions for
backwards statement-compatibility) is as follows:

   CALL INT86OLD (int_no, in_array(), out_array())
   CALL INT86XOLD (int_no, in_array(), out_array())

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