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Q28442: OS/2 Protected Mode Restrictions for BASIC Compiler 6.00/6.00b

Article: Q28442
Product(s): See article
Version(s): 6.00 6.00b 7.00
Operating System(s): OS/2
Keyword(s): ENDUSER | | mspl13_basic
Last Modified: 2-FEB-1990

The following is a list of restrictions under MS OS/2 protected mode
for Microsoft BASIC Compiler Versions 6.00 and 6.00b and Microsoft
BASIC Professional Development System (PDS) Version 7.00:

 1. Programs using statements that refer directly to addresses in the
    machine's physical memory may need modification when run in
    protected mode, for example, CALL ABSOLUTE, DEF SEG, PEEK, POKE,
    BLOAD, BSAVE, VARPTR, and VARSEG.

 2. Graphics are limited to screens 1 and 2. EGA and VGA graphics are
    not supported in protected mode.

 3. Except for BEEP, no sound is supported. SOUND or PLAY statements
    are not allowed in protected mode. As a workaround, you can make
    an OS/2 CALL to create a sound with a specified frequency and
    duration.

 4. Light pens and joysticks are not allowed in protected mode.

 5. CALL INT86, INT86OLD, INT86X, INTERRUPT, and INTERRUPTX are not
    available in protected mode.

 6. COLOR is ignored in Screen 1 in protected mode.

 7. INP and OUT are not available in protected mode.

 8. IOCTL and IOCTL$ are not available in protected mode.

 9. PALETTE [USING] is not available in protected mode.

10. WAIT is not available in protected mode.

11. If a program in real mode is using the serial communications port
    (COM1 or COM2), then you cannot use that port in protected mode at
    the same time. This is an OS/2 restriction. The reverse is also
    true: if a program in protected mode is using the communications
    port (COM1 or COM2), then you cannot use that port in real mode at
    the same time.

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