Jumpers/Switches/Controls

Jumpers

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X = jumpered
O = unjumpered
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Jumper                       Pin            AT Single       AT Master      AT Slave      XT
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Master/Slave                 1-2            X               X              O             (3)     
                                                                                                 

Slave present                3-4            O               X              O             (3)     
                                                                                                 

Active LED                   5-6            X               X              O (2)         X       
                                                                                                 

Host; slave present          5-7            O               O              X (2)         O       
                                                                                                 

XT mode                      7-8            O               O              O             X       
                                                                                                 

40 MB cap. (XT only)         1-2            O               O              O             X       
                                                                                                 

30 MB cap. (XT only)         3-4            O               o              o             x       
                                                                                                 

20 MB cap. (XT only)         1-2 & 3-4   o               o              o             x       
                                                                                                 

Factory test                 7-9            Factory Use Only                                  
                                                                                              

Bus reset hi (1)             10-12          O               O              O             O/X     
                                                                                                 

Bus reset lo (1)             11-12          X               X              X             O/X
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(1) Bus reset active level. System dependent. A jumper must be installed on either Bus Reset Hi or Bus Reset Low; the drive will not function if neither set of pins is jumpered.
(2) HSP /Assert "/DASP" signal: pin 39 on the 40-pin AT/XT Interface connector. The Host Slave Present jumper and the Active LED jumper are mutually exclusive.
(3) XT only. These jumpers are used to set the drive type information to be returned by the drive via the Drive Configuration register (I/O port 2) or the XT interface.

Commonly Used Jumper Settings:
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