~~ I>~~~~~~~~~ q q~~~~~~ .TITL DKDCB .NREL .ENT DIRR,DSKDB .EXTN DP0DB,DSKDC "D*400+"K ;KEY MPDCB  ;ADDRESS OF MAP DCB DP0DB  ;NEXT DCB IN CHAIN .BLK 1  ;NUMBER OF LAST BLOCK .BLK 1  ;BYTES IN LAST BLOCK DSKDB: DIRR: DSKDC  ;DCT ADDRESS 0  ;UNIT NUMBER .BLK 2  ;PAD STINI+STCMK ;UNIT RELEASE AND NOT INITABLE .BLK 2 DIRR  ;SYS.DR DCB POINTER .BLK 1 0 0 0 .BLK 1  ;NUMBER OF LAST BLOCK .BLK 1  ;BYTES IN LAST BLOCK MPDCB: DSKDC  ;DCT ADDRESS 0  ;UNIT NUMBER .BLK DCBLA-DCBCA+1 DIRR  ;SYS.DR DCB ADDRESS .BLK 1  ;FIRST ADDRESS .END *U*U*U*U @