First post, by AlessandroB
What happens if i insert i ISA Single board computer in a rugular full working PC? some malfunction? who control the ISA bus??? tnks
What happens if i insert i ISA Single board computer in a rugular full working PC? some malfunction? who control the ISA bus??? tnks
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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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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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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.
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.
Retronautics: A digital gallery of my retro computers, hardware and projects.
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.
very interesting, but that not means two separate system in the same case.
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.
wrote:What happens if i insert i ISA Single board computer in a rugular full working PC? some malfunction? who control the ISA bus??? tnks
Is this too much voodoo?
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.
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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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.
yes, but my intention is to use it in a regular PC, so is not possible. tnks
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.
taping off all data pins on the SBC would work too I guess?
a lot of them have everything you need on board, or you could still expand via PC/104?
Yes, ISA pins isolation and powering through molex/fdd connector should do the trick.