.OFINI
.OFDEF DI.MAX, 4 ; number of blocks on disk
.OFDEF DI.USE, 4 ; blocks in use
.OFDEF DI.FRE, 4 ; blocks free
.OFDEF DI.CTG, 4 ; largest contiguous area
.OFDEF DI.DCH, DC.SIZ ; DEVCHR return area
.OFDEF DI.DFR, DF.SIZ ; DSKFRE return area
.OFSIZ DI.SIZ