Microsoft KB Archive/38886

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Leading Edge Display Problems with QuickBasic Version 4.50

Article ID: 38886

Article Last Modified on 11/21/2006


  • Microsoft QuickBasic 4.5 for MS-DOS

This article was previously published under Q38886


Microsoft has not tested QuickBasic version 4.50 with Leading Edge computers; therefore, we do not claim any compatibility between QuickBasic version 4.50 and Leading Edge. Running QuickBasic version 4.50 on a Leading Edge computer might give you some display or editor problems.

It has been reported that QuickBasic works correctly with Leading Edge Model D with ROM BIOS version 3.00 or later (running MS-DOS 3.30), but may fail with earlier versions. Microsoft has not confirmed this information. Other unconfirmed reports are listed below.


One customer reported that when using a Leading Edge Model M, you cannot get QuickBasic version 4.50 to appear on the screen successfully. The problem occurs with either a Leading Edge Hercules video card or a Leading Edge CGA video card. According to the report, earlier versions of QuickBasic work correctly. According to one customer, the Leading Edge Model M (and Model MT) has a Switch 3 for Advanced Features (for color support and RS-232 enhancements). If Switch 3 is ON, the picture is bad using a CGA card and monochrome monitor, but with Switch 3 off, the screen looks fine.

One customer reported that on a Leading Edge model MP running DOS version 3.30 on a Hercules Graphics Card Plus, switching switch 3 to off on the back of the machine corrects display problems when starting QuickBasic.

It has been reported that a Leading Edge Model D does not work correctly when used with either the Microsoft Mouse or the shortcut editing keys when cutting and pasting text in QuickBasic 4.50. The first time an attempt is made to cut and paste text, the operation is successful. However, when a second attempt is made to cut and paste text, the operation is unsuccessful.

It also has been reported that when TRACE is on in the QuickBasic environment, the lines of text are not highlighted; only a cursor appears, moving from line to line. The Leading Edge's video card may be causing the problem.

Two customers reported that SETUP.EXE would not work on the Leading Edge Model D, but they could run QuickBasic and QB Express from the floppy disks.

A customer with a Leading Edge Model D2 found a solution to his video problems using QuickBasic. He said an ATI video file came with his computer. He ran the VCONFIG program, which contains a menu that let him set video options. His computer was set to VGA but he had an EGA; he set it to EGA, and then QB.EXE worked correctly with no video problems.

As stated above, this information has not been confirmed by Microsoft.

Additional query words: QuickBas

Keywords: KB38886