Eisa Bus Options; Identifying Isa And Eisa Options; Figure 6-4 Eisa And Isa Boards - Digital Equipment 3300R Service Manual

EISA Bus Options

The EISA (Extended Industry Standard Architecture) bus is a 32-bit industry standard I/O
bus. EISA is a superset of the well-established ISA bus. EISA was designed to accept
newer 32-bit components while remaining compatible with older 8-bit and 16-bit cards.
EISA offers performance of up to 33 Mbytes/sec for bus masters and DMA devices.
Up to three EISA or ISA modules can be installed. If the 64-bit PCI slot is used, only two
EISA options can be installed. All slots are bus master slots. EISA slots can be filled in
any order.
WARNING: For protection against fire, only modules with current-limited

Identifying ISA and EISA Options

By examining the contacts of the option board you can determine whether a board is EISA
or ISA. (See Figure 6-4.)
•
ISA boards have one row of contacts and no more than one gap.
•
EISA boards have two interlocking rows of contacts with several gaps.

Figure 6-4 EISA and ISA Boards

outputs should be used.
ISA
EISA
System Configuration and Setup
DIGITAL Server 3300/3300R 6–17
M A 0 0 1 1 1