Microsoft KB Archive/39256
Article ID: 39256
Article Last Modified on 11/21/2006
This article was previously published under Q39256
Customers have reported that QuickBasic version 4.5 does not function correctly with a 25-MHz 80387 math coprocessor chip. The reported problems include the following:
- Incorrect floating-point numeric results
- Coprocessor not detected
This problem does not occur on 80387 chips slower or faster than 25 MHz.
Microsoft has not tested QuickBasic version 4.5 with 25-MHz 80387 chips.
To test potential problems, you can compare numeric results with and without the coprocessor by turning on or off QuickBasic's access to the coprocessor. The following MS-DOS command turns off QuickBasic's access to the coprocessor in the current boot session (where any message with one or more characters must follow the equal sign [=]):
The following command makes the coprocessor accessible again (where no characters follow the [=]):
One customer reports that QuickBasic 4.5 didn't recognize a 25 MHz 80387 on an Atronics 386B motherboard. Microsoft has not confirmed this information.
Additional query words: QuickBas 4.50