// OVERLAYS.D - declarations for OVERLAYS package
// last edited June 26, 1976  1:06 PM
// Midas removal of onStack bit 30 November 77


structure OD: [	// overlay descriptor
	da word	// disk address
	core word	// core page (for lock)
	firstPn word	// first page # in file
	]
manifest ODsize = (size OD)/16