EISA – Extended Industry Standard Architecture

Extended Industry Standard Architecture (EISA) is a bus architecture designed for PCs using an Intel 80386, 80486, or Pentium microprocessor. EISA buses are 32 bits wide and support multiprocessing.

The EISA bus was designed by nine IBM competitors (sometimes called the Gang of Nine): AST Research, Compaq Computer, Epson, Hewlett-Packard, NEC, Olivetti, Tandy, WYSE, and Zenith Data Systems. They designed the architecture to compete with IBM’s own high-speed bus architecture called the Micro Channel architecture (MCA).

The principal difference between EISA and MCA is that EISA is backward compatible with the ISA bus (also called the AT bus), while MCA is not. This means that computers with an EISA bus can use new EISA expansion cards as well as old ATexpansion cards. Computers with an MCA bus can use only MCA expansion cards.

EISA and MCA are not compatiblewith each other. This means that the type of bus in your computer determines which expansion cards you can install.

Neither EISA nor MCA has been very successful. Instead, a new technology called local bus (PCI) is being used in combination with the old ISA bus.

Webopedia Staff
Webopedia Staff
Since 1995, more than 100 tech experts and researchers have kept Webopedia’s definitions, articles, and study guides up to date. For more information on current editorial staff, please visit our About page.

Related Articles

Photo Editing Software

Photo editing software is used to manipulate or enhance digital images. This category of software ranges from basic apps, which are able to apply...

SOHO Business Solutions: Free Email Marketing Services

Just like big businesses, SOHO (small office/home office) owners can leverage email marketing systems to communicate with customers, partners and employees. Just like big businesses,...

Fintech

Fintech, also known as "financial technology," is a term used to describe companies that use innovative technology to create more efficient, transparent, and cost-effective...

Cyber Security

Cyber security is the practice of protecting computer systems, networks, and data by using a variety of different strategies and tools. Many large companies...

ScalaHosting

ScalaHosting is a leading managed hosting provider that offers secure, scalable, and affordable...

HRIS

Human resources information system (HRIS) solutions help businesses manage multiple facets of their...

Best Managed Service Providers...

In today's business world, managed services are more critical than ever. They can...