Q42589: Mouse Not Supported on VGA in OS/2 Real Mode; OK in MS-DOS
Article: Q42589 Product(s): See article Version(s): 6.00 6.00b 7.00 | 6.00 6.00b 7.00 Operating System(s): MS-DOS | OS/2 Keyword(s): ENDUSER | SR# S890222-67 B_QuickBas | mspl13_basic Last Modified: 2-FEB-1990 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 MS OS/2, and to Microsoft BASIC Professional Development System (PDS) Version 7.00 for MS-DOS and MS OS/2. In MS OS/2 real mode under MS OS/2 Versions 1.00 and 1.10, due to limitations of the MS OS/2 mouse controller, the mouse driver does not support operating with VGA graphics. The mouse works correctly in EGA, CGA, and text modes. This problem was corrected in MS OS/2 Version 1.20. In MS OS/2 protected mode, the MS OS/2 mouse driver does not support the drawing of the mouse pointer in graphics modes. It is up to the application to draw its own pointer. The mouse driver provides notification of mouse movement to an MS OS/2 application, provided that the VioSetMode CALL (set graphics mode) is used AFTER the MouOpen (open the mouse) and the MouSetDevStatus (to disable pointer drawing) CALLs are performed. More information on the VioSetMode and MouSetDevStatus MS OS/2 API CALLs can be found in the "Microsoft Operating System/2: Programmer's Toolkit Programming Tools."
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