IBM RS/6000 - Manual (Page 44)

The X-bus interface
An I C bus which supports RAS monitoring features on processor card
2.4 RS/6000 Model E20 Product Description
The RS/6000 Model E20 is the first member of the PCI-based RS/6000 family of
servers to become available. It is designed to allow for system growth in memory,
disk and media devices as the customer's needs grow. The E20 server is a
low-priced, high performance commercial server. By combining AIX Version 4.1.4
reliability and functionality with industry standard bus architectures, the E20 offers
exceptional value for multiuser applications.
Figure 8. RISC System/6000 Model 7024-E20
The 7024-E20 offers fast processing and outstanding performance capabilities due
to PowerPC 604 technology running at 100 MHz. It can process an estimated 735
transactions per minute (tpm). Due to these powerful features, this entry level
workgroup server can be a great choice for managing department, stand-alone or
distributed-computing environments. It works as a great server to the Model 43P
Series workstations as well as other workstations.
The E20 has been designed for customer set up. The modular processor card
makes it convenient to replace the microprocessor card as new PowerPC
technology emerges. Eight media bays and eight expansion slots provide enough
room to grow. The I/O slots support the emerging high-performance PCI standard
as well as the traditional ISA bus architecture.
The E20 is packaged in an 8 x 8 (eight I/O slots, eight-disk/media bay), allows up
to a maximum of 13.2 GB of internal storage capacity and features a flexible I/O
subsystem of 5 PCI, 2 ISA and one shared slots.
20 Introduction to PCI-Based RS/6000 Servers