Eisa And Isa Options; Eisa Bus - Compaq AlphaServer 1000A Owner's Manual

Configuring Your System

EISA and ISA Options

You can determine whether an option card is an EISA or ISA option by examining the
contacts of the card (see Figure 6-14):
•
EISA cards have two interlocking rows of gold contacts.
•
ISA cards have a single row of gold contacts.
Figure 6-14: EISA and ISA Cards

EISA Bus

The EISA (Extended Industry Standard Architecture) bus is a 32-bit industry standard
input/output bus. EISA is a superset of the well-established 16-bit ISA bus. EISA was
designed to accept newer 32-bit components, while still remaining compatible with older
8-bit and 16-bit cards.
EISA offers performance of up to 33 MB/sec for cards with bus mastering and DMA
capabilities. Up to eight EISA or ISA modules can reside in the EISA bus portion of the
system board. All EISA slots are bus master slots, and can be filled in any order.
Figure 6-15 shows the location of EISA and ISA option slots on the system board. To
access the slots, you will need to remove the top and left panels of the system enclosure.
Be sure to replace the panels before attempting to start the system again.
6-14 AlphaServer 1000A Rackmount Owner's Guide
ISA
EISA
MLO-011570