;DSKINF return area .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 .