public @dtbl
	extrn sd0,sd1,sd2,sd3

	cseg

@dtbl	dw sd0,sd1,sd2,sd3	; drives A-D
	dw 0,0,0,0		; drives E-H non-existant
	dw 0,0,0,0		; drives I-L
	dw 0,0,0,0		; drives M-P

	end