0017 Control word used to load SA4000 URegister bank 7x. last edit January 14, 1982 4:42 PM 0100 70 - dbUDataAddr, Real address of first page of data buffer 0C24 71 - dbUFindIndexMkCmd, Find Index Mark command 0C26 72 - dbUFindSectMkCmd, Find Sector Mark Command =426+Head Num*800'X 0C20 73 - dbUFreezeCmd, command word used to stop transfer, =420+Head Num*800'X 0002 74 - dbUHeaderAddr, address of Header in 1st 64k of real memory 001E 75 - dbUHeaderQuitMsk, Mask used to detect error after Header read 0800 76 - dbUHeadIncr, used to increment Head number in commands 0004 77 - dbULabelAddr, real address of label in lo 64k 001E 78 - dbULabelDataQuitMsk, used to detect error after read of label or data 0430 79 - dbUReadCmd, command word causing read of field from sector on disk 001C 7A - dbUSectorCount, number of sectors to read 001C 7B - dbUSectorsLeftInTrack, number of sectors left in track 001C 7C - dbUSectorsPerTrack, number of sectors per track 0C22 7D - dbUSeekCompleteWaitCmd, command to wait for seek complete 0000 7E - not used 0000 7F - not used 0027 Control word used to load SA1000 dbURegister bank 7x. 0100 70 - dbUDataAddr, Real address of first page of data buffer 0C24 71 - dbUFindIndexMkCmd, Find Index Mark command 0C20 72 - dbUFindSectMkCmd, Find Sector Mark Command =426+Head Num*800'X 0C20 73 - dbUFreezeCmd, command word used to stop transfer, =420+Head Num*800'X 0002 74 - dbUHeaderAddr, address of Header in 1st 64k of real memory 005E 75 - dbUHeaderQuitMsk, Mask used to detect error after Header read 0800 76 - dbUHeadIncr, used to increment Head number in commands 0004 77 - dbULabelAddr, real address of label in lo 64k 001E 78 - dbULabelDataQuitMsk, used to detect error after read of label or data 0430 79 - dbUReadCmd, command word causing read of field from sector on disk 001C 7A - dbUSectorCount, number of sectors to read 0010 7B - dbUSectorsLeftInTrack, number of sectors left in track 0010 7C - dbUSectorsPerTrack, number of sectors per track 0C22 7D - dbUSeekCompleteWaitCmd, command to wait for seek complete 0C32 7E - dbUVerifyCmd, Command used to verify Headers 0100 7F - dbUHeadSect, head and Sector number of first sector in boot file 0067 Control word used to load Trident dbURegister bank 7x for Disk 0. 0400 70 - bU0400 0600 71 - bUMask 0C00 72 - bU0C00 0C04 73 - bU0C04 0C0A 74 - bU0C0A 2C04 75 - bU2C04 F000 76 - bUF000 0100 77 - bUDtPtrLo 0000 78 - bUBitSignAdr 0000 79 - not used 0000 7A - not used 0000 7B - not used 0000 7C - not used 0000 7D - not used 0000 7E - not used 0000 7F - not used