Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

What is an ISA and PCI and why are they used?

Status
Not open for further replies.

mhamed

Advanced Member level 4
Joined
Jul 28, 2004
Messages
114
Helped
10
Reputation
20
Reaction score
2
Trophy points
1,298
Activity points
827
ISA and PCI

Hi
is there anybody who can explain me what is ISA and why it is used? and is PCI sth like ISA but improved it or not? :?:
Thanks
Best Regards!
 

FoxyRick

Advanced Member level 4
Joined
Jan 8, 2004
Messages
1,249
Helped
321
Reputation
640
Reaction score
277
Trophy points
1,363
Location
England, UK
Activity points
12,978
Re: ISA and PCI

ISA are older than PCI. ISA stands for Industry Standard Architecture. There is another type of old slot called EISA (Extended ISA). ISA slots were on the very first IBM PC!

Making cards to plug in to ISA is much (really, much) simpler, but not many (any?) modern PC's have them. You are most likely to encounter them on emdedded PC boards these days.

PCI slots can transfer data much faster, share irq's and resources, take control of buses and are designed to work better with modern operating systems. They are also practically impossible for amateurs to make boards for :(

Cheers,
FoxyRick.
 

cherrytart

Advanced Member level 4
Joined
Feb 26, 2002
Messages
118
Helped
5
Reputation
10
Reaction score
1
Trophy points
1,298
Location
oklahoma
Activity points
1,037
ISA and PCI

I have read that ISA and EISA cards are not supported in Windows XP. This seems odd since some of the ISA cards are Plug and Play.

Oh well, older motherboards become cheaper faster than new motherboards. I still have a 4.77 MHz 8086 running DOS just because my prototype EPROM burner is EISA. Well, because its EISA and I don't want to put a homemade circuit that uses 21 volts in a computer I actually work with.
 

Pinczakko

Full Member level 2
Joined
Jul 29, 2004
Messages
138
Helped
13
Reputation
26
Reaction score
0
Trophy points
1,296
Location
Taka Bonerate National Park, Indonesia
Activity points
1,592
Re: ISA and PCI

ISA is 16-bit bus while PCI is 32-bit bus. ISA is "eating" pretty much of the 64KB of the x86 I/O space while PCI only uses CFCh-CFFh. The bus speed also different. If you are programming for this bus, then the only thing that matter is the protocol of the bus, especially addressing, timing, etc. Look at Mindshare's PCI System Architecture and ISA System Architecture book for more explanations.
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top