Int 15/AH=BCh

Phoenix 386 BIOS - DETERMINE CPU SPEED FOR DELAY LOOPS

AH = BCh

Return:
CF clear
(Phoenix 1.10 10a) BYTE 0040h:00B0h set to delay loop count
(Dell 4xxDE BIOS A11) WORD 0040h:00ECh set to delay loop count

Note: This function reads system timer channel 0 twice, then does calculations on the returned values to determine the delay loop counter needed by the BIOS for beeps and floppy timeouts

See Also: AX=2305h - MEM 0040h:00B0h

Category: Vendor-specific BIOS Extensions - Int 15h - P

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