PC104 & PC104plus

Is it possible to have multiple pc104/pc104+ processors in a stack? I realise that pc104 is based on ISA bus and therefore this probably prevents multiple processors on the same bus, but what about pc104+?

Any comments would be appretiated

Don

Reply to
DaveMarkMason
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realise

multiple

As I recall, PC-104+ just added the PCI bus on separate connectors - the ISA bus is still there. Personally, I wouldn't try having two bus masters on either passive bus, ISA or PCI.

What are you trying to do? Trying to save space by having multiple CPU cards in one stack, or trying to have the cards share some other card or memory?

Kelly

Reply to
Kelly Hall

Hi Kelly, I would like to have one processor running some fairly intensive ethernet comms and then present it's data to the 2nd processor over the bus. Or alternatively, signal to the 2nd processor that the data is available and then allow the 2nd processor to read it. Don

Reply to
DaveMarkMason

With only 1 bus, you would not have 2 processors running in parallel. You need a two-processor board running an OS that can multi-task, multi-thread. However,

I HAVE seen a system used by NOAA and the Navy for undersea buoys that has TWO PC104 Processors, one fast and one low power. The fast one is powered off during data collection and is only used to process and transmit data. The low power one operates constantly and maintains a data collection of water temperature and GPS location. Obviously there is an ingenious power-switch in the PC104 "stack" that permits this to work. - RM

Reply to
RickMerrill

snipped-for-privacy@aol.com (DaveMarkMason) wrote in news: snipped-for-privacy@mb-m26.aol.com:

You can mix and match plus and non-plus boards, and the plus connector is just a PCI bus, which is multi-master. Just don't use the ISA connector. I'd guess that most plus masters also include the ISA connector, so put a dummy board in between with just the PCI connector populated.

--
Kenneth Porter
http://www.sewingwitch.com/ken/
Reply to
Kenneth Porter

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