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AH = 12h BL = 36h AL = new state 00h enable refresh 01h disable refresh
Return:
AL = 12h if function supported
Desc: Specify whether the contents of video memory should be displayed on the screen; disabling refresh effectively blanks the screen
Note: When display refresh is disabled, the entire screen displays the color specified by the DAC color register 00h; thus to actually blank the screen, the application must first ensure that that register has been set to black
BUG: GEM/VIEWMAX ET3000 and ET4000 drivers dated 1988/6/23 do not correctly reenable refresh after the screen has been blanked due to inactivity, resulting in a total loss of video synchronization
See Also: AX=BF05h
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