Compaq Deskpro 2000 Service & Reference Manual page 48

5. On all BX platforms, the LS-120 drive should be sequenced as the primary drive on the
secondary channel and system board jumper P33 must be removed.
6. On all 810 platforms, the LS-120 should be sequenced as the primary drive on the secondary
channel and system board jumper E23 must be removed.
4-2 IDE/ATAPI Device Sequencing Guidelines