Primary I/O Drawer
The primary I/O drawer has the following:
v 14 PCI slots
v System operator panel
v SPCN controller
v System media
v Service processor
v Optional boot DASDs that occupy PCI slots 13 and 14
v Various connectors, including four serial port connectors, on the back of the drawer for the attachment
of external devices
Note:
Serial ports 1 and 2 can only be used to access the service processor menus. No
″heartbeat″-type devices or cables can be used on these ports. ″Heartbeat″-type devices or
cables must be installed on serial port 3 or serial port 4.
The
PCI bus speeds are as follows:
v Up to 33 MHz for the four 32-bit slots at 5 V
v Up to 66 MHz for the ten 64-bit slots at 3.3 V
Slots
1-5, 8-10, 13 and 14 support either 32- or 64-bit PCI adapters. The remaining slots are 32-bit only.
The CEC drawer includes the interrupt and system bus control logic.
The primary I/O drawer has space for up to three media devices. The diskette drive and CD-ROM drive
are standard; the third media device is optional.
“Data Flow” on page 4 illustrates the system’s data flow.
Chapter 1. Reference Information 3
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