Digital Equipment AlphaServer 2000, Руководство пользователя

Страница: 109 / 196

EISA Bus Options
EISA Bus Options
The EISA bus (Extended Industry Standard Architecture bus)
is a 32-bit, industry-standard I/O bus. EISA is a superset of the
well-established 16-bit ISA bus. EISA was designed to accept
newer 32-bit options while still remaining compatible with older
8-bit and 16-bit options.
With a bandwidth of 33 MB/sec, EISA is well suited to
medium-performance options, such as modems, asynchronous
communication controllers, and other miscellaneous peripherals.
Up to seven EISA (or ISA) modules can reside in the EISA bus
portion of the card cage. All slots are bus master slots. EISA
slots can be filled in any order.
Figure 3–2 shows the location of EISA slots. To access the card
cage, remove the system cover. Refer to Figure 2–5 and the
accompanying instructions before removing the cover. Be sure to
reattach the four cover screws before attempting to power up the
system again.
Caution
Do not remove the cover when the system is running. If
you do, the system will power down and you may lose
data.
Options and Upgrades 3–25