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.