INT 10 - Chips & Technologies '64300' BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. - GET REFRESH RATE
	AX = 5F04h
	BL = video mode number
Return: AL = 5Fh if function supported
	    AH = status
		00h unsuccessful
		01h successful
		    BH = available refresh rates (see #00182)
		    BL = currently-set refresh rate (see #00182)
SeeAlso: AX=5F03h"64300",AX=5F05h"64300"


Bitfields for C&T 64300 refresh rates:
Bit(s)	Description	(Table 00182)
 5	75 Hz
 4	72 Hz
 3	70 Hz
 2	60 Hz
 1	56 Hz
 0	interlaced