Seagate ST9420A Manuale Utente

Master/slave
configuration
jumpers

Pin 1

Pin 20 removed

for keying

Circuit board

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 1. ATA interface connector and master/slave

configuration jumpers

Marathon 420sl Installation Guide, August 1995