struc dpt
.steprate resb 1
.dmahdld resb 1
.motoroff resb 1
.sectorsize resb 1
.lastsector resb 1
.gaplen resb 1
.dtl resb 1
.gapfmt resb 1
.fillchar resb 1
.hdsettle resb 1
.motoron resb 1
endstruc