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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