VOGONS


First post, by AlessandroB

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What happens if i insert i ISA Single board computer in a rugular full working PC? some malfunction? who control the ISA bus??? tnks

Reply 2 of 17, by Tiido

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You'll most probably end up with damage due to massive bus contention that will go on. Neither side will probably booth and both sides will have their bus buffers get hot and probably die 🤣.

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Reply 3 of 17, by Vynix

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You're going to either fry the computer, the SBC or both. In either case you'll end up making the SBC or the motherboard release the magic smoke (as goes the private joke)

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Reply 4 of 17, by derSammler

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You are not going to fry anything, as long as the SBC uses all ISA pins according to the standard. It will simply not work, as the SBC and the motherboard will conflict, preventing the system from coming up at all.

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Reply 5 of 17, by appiah4

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derSammler wrote:

You are not going to fry anything, as long as the SBC uses all ISA pins according to the standard. It will simply not work, as the SBC and the motherboard will conflict, preventing the system from coming up at all.

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Reply 6 of 17, by dionb

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IIRC it will work if you remove the BIOS chip on the motherboard, so it doesn't initialize anything. That leaves the ISA bus free for the SBC.

I once built a system like this, but that was very long ago and I don't recall details.

Reply 8 of 17, by dionb

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AlessandroB wrote:

very interesting, but that not means two separate system in the same case.

No. If you really want two separate systems, they can't share the same bus.

Reply 10 of 17, by Errius

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Reply 11 of 17, by cyclone3d

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AlessandroB wrote:

very interesting, but that not means two separate system in the same case.

You can get cases that are meant to house two motherboards.

You can also get backplanes that can handle multiple SBCs.

There were some cards made that were meant to plug into a slot in a regular motherboard and act as a separate computer.

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Reply 12 of 17, by HanJammer

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derSammler wrote:

You are not going to fry anything, as long as the SBC uses all ISA pins according to the standard. It will simply not work, as the SBC and the motherboard will conflict, preventing the system from coming up at all.

Exactly. I don't know where people get these ideas...

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Reply 13 of 17, by wiretap

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You can get special SBC's that are designed to be put into a fully working system that will (somewhat) act as a completely separate computer, but more like a coprocessor so you can share information between the two systems. Look at IBM ARTIC cards. At work, I use one that is ISA -- it has a 80C186 processor. There is also a PCI version.

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Reply 15 of 17, by aleksej

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Powerleap makes fully independent SBCs that occupy ISA slot on MB just for more secure fit besides backplane screw. ISA edge connector on that SBCs has no any signal or power lines. Look for Powerleap PL-Renaissance.