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CHAPTER 4: Hardware Installation
Table 4-1 describes the advantages and disadvantages of using the high and low
memory configuration on your PCI or PCI Express adapter.

Table 4-1. Advantages and disadvantages of using the high and low memory

configuration

Memory Advantages Disadvantages
High Memory Compatible with all PCI Old legacy applications
v2.1 compliant PCs. may not work.
Low Memory All legacy applications May fail in some PCs
will still work. that reserve low memory.
The term “legacy application” refers to those applications that were built for
Windows 3.x, or require the emulation card to be in low memory. Applications that
use the Windows 95/98/NT driver directly are not affected by the memory
resources held by the PCI card.
4.2.5 PCI E
XPRESS
F
EATURES
The PCI Express card contains three new features that provide improved
performance and functionality.
Requirements
The OBS and 2 MHz features require the following hardware and software
combination on the AS/400 in order to operate.
• Twinax controller: PCI WAN/Twinaxial IOA (FC 2720/9720) or PCI
Twinaxial Workstation IOA 9FC 2722/9722) or Twinaxial Workstation IOA
(FC 6180/9280)
• Operating system: OS/400 V4R1 or V4R2
• Cabling: Twinax cable with a maximum length of 4000 ft. (1219 m) for 2 MHz
mode or 5000 ft. (1524 m) for OBS mode.