Category: <b>video</b>
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<pre><b>INT 10 - UNCHAIN - UPDATE PAGE 4 OFFSET</b>

	AX = CB04h
	BX = offset of page 4
Return: nothing
Desc:	inform UNCHAIN of the location of video page 4 in video memory; the
	  default is BB80h (48000, for 320x200)
SeeAlso: AX=CB01h,AX=CB02h,AX=CB03h,AX=CB05h
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