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

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 6-3):
EISA cards have two interlocking rows of gold contacts.
ISA cards have a single row of gold contacts.
Figure 6-3 EISA and ISA Cards
M A 0 0 2 7 8

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. Two EISA or ISA
modules can reside in the EISA bus portion of the system board. Both EISA slots
are bus master slots, and can be filled in any order.
Figure 6-4 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.
Caution: Do not remove the system's top cover when
the system is running. If you remove the top cover
without first properly turning off the system, the system
will shut down, with potential loss of data.
6-14 Configuring
ISA
EISA
AlphaServer 1000A Owner's Guide