Microsoft KB Archive/40633

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SCREEN 4 Fails on COMPAQ Portable III and Sharp Laptop

Article ID: 40633

Article Last Modified on 11/21/2006


  • Microsoft QuickBASIC 4.0b
  • Microsoft QuickBasic 4.5 for MS-DOS
  • Microsoft BASIC Compiler 6.0b
  • Microsoft BASIC Professional Development System 7.0

This article was previously published under Q40633


Basic's SCREEN 4 is designed for the Olivetti/AT&T high-resolution screen mode (640 x 400). This screen mode allows you to run programs that utilize the special screen mode available on the Olivetti PC, models M24, M28, M240, M280, and M380, and the AT&T PC 6300 Personal Computer series.

This information applies to Microsoft QuickBasic versions 4.0b and 4.5, Microsoft Basic Compiler version 6.0b for MS-DOS and MS OS/2, and Microsoft Basic PDS version 7.0 for MS-DOS and MS OS/2.


If you have one of the computers mentioned above, you can utilize the 640 x 400 resolution screen mode by using SCREEN 4. The computers listed above are the only computers with which this mode was tested; therefore, Microsoft cannot guarantee that the mode works correctly on any other hardware configuration.

SCREEN 4 fails on the following hardware:

Sharp MZ-100 Laptop with AT&T compatible monochrome display, according to an unconfirmed report from a customer.

Additional query words: QuickBas BasicCom 4.50 4.00b 6.00b 7.00

Keywords: KB40633