Figure 2. Connector And Master/Slave Jumper Setup For The St9816Ag - Seagate MARATHON 810 Product Manual

16 Marathon 810 (ST9816AG) Product Manual, August 1995
Master/slave
Pin 1
configuration jumpers
B D
A C
Drive is master; slave may be detected using DASP– signal
Drive is master; Seagate slave drive present
Drive is slave; Seagate master drive present
Use CSEL pin grounding to differentiate master from slave

Figure 2. Connector and master/slave jumper setup for the ST9816AG

Note. Drive is shown with
circuit board up.
Pin 20 removed for keying
Circuit board