INT 62 u - FGDRIVER v4.02 - "FG_IMAGEBUF" - SPECIFY TEMPORARY IMAGE BUFFER
	AX = 005Bh
	ES:BX -> buffer to be used when creating or displaying GIF/PCX/PPR/SPR
		  images
	CX = size of buffer in bytes or 0000h to use internal buffer
Notes:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474 at AX=0000h)
	Fastgraph's internal buffer is 4096 bytes; this function allows the
	  application to define a larger buffer which will typically speed
	  processing
SeeAlso: AX=006Ch,AX=006Dh,AX=006Eh,AX=00B9h,AX=00BAh,AX=00BBh