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masking interrupts

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Does anyone know how to disable a system interrupt under Windows 98?

I am trying to disable the system timer for a period of time so a loop within a data acquisition program can run uninterrupted, however I can only turn everything off (and therefore lose ulitimate control through the mouse & keyboard) with the CLI command. I am unable to mask only certain interrupts for that time. I have tried unsuccessfully to write to the 8259 (OCW1) at address 0x21 (and 0xA1 for real-time clock).

Any information would really help!


Thanks for your time

Terry





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