User's Manual

Table Of Contents
Basics Data Buses - 9
Narrow SCSI-1 Bus
All internal and external devices on the SCSI-1 chain must
have unique ID numbers. SCSI ID numbers 0 through 6 are
available. Always terminate the last internal and the last
external SCSI-1 device.
Ultra Wide SCSI-3 Bus
Ultra Wide SCSI support is offered on the Power Macintosh
G3 Desktop as an optional feature via an Ultra Wide SCSI PCI
card (p/n 661-2011). If present, this card is installed in
the first PCI slot on the logic board. You can connect a total of
two internal devices to the Ultra Wide SCSI-3 bus.
Important
: Before you connect an internal device to the Ultra
Wide SCSI-3 bus, refer to the information on cable length
limits and termination later in this section.