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SNAP Mode:
When the snap mode is enabled the processor clock is reduced to 50% of its original speed. As soon as an interrupt (IRQ, NMI, SMI) or a DMA access occurs, the processor clock is reset to 100%. Four milliseconds after the last interrupt or DMA, the processor clock is again reduced to 50%.
SLEEP Mode:
When running in sleep mode the processor operates at 100%. As soon as the processor starts waiting for a keyboard input (BIOS INT 16H accessed but no data in key buffer), a HALT command is issued, and the processor speed is set to zero. Pressing any key will cause the processor to return to its original speed. MS Windows does not use the INT 16H procedure, and therefore the sleep mode has no effect in this environment.