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486Tang – 486 on a credit-card-sized FPGA board

nand2mario.github.io

31–40 of 60 posts

Re: 486Tang – 486 on a credit-card-sized FPGA board

#31
post #24

Earlier quoted context omitted.

Yes, for exactly the reason. SDRAM is much easier to work with in retro computing than DDR.

My first DDR system, an Athlon XP, feels like a very different beast than my 440BX with SDRAM despite being only a couple years newer. :)

I had that with a Geforce2. Or was Athlon 2000. Wait, Athlon 2000 at 1666 MHZ, really fast until the capacitors on a Gigayte motherboard blew up.

Re: 486Tang – 486 on a credit-card-sized FPGA board

#34

Silly question. Are there any 486-compatible small CPUs that could be embedded into a project instead of using an FPGA? Given that AMD, Intel and others have the ability to make 486-compatible processors currently, I would have thought you could just buy a CPU or SoC to run 486 code.

Intel did have a product like that but it's been discontinued: https://en.wikipedia.org/wiki/Intel_Quark

AMD even had two of them. Their own: https://en.wikipedia.org/wiki/AMD_%C3%89lan and based on the Cyrix x586 after they acquired them: https://en.wikipedia.org/wiki/Geode_(processor)

They weren't even that bad considering the little power they needed.

Re: 486Tang – 486 on a credit-card-sized FPGA board

#35
post #16

When you say "credit-card-sized," I expect the thickness to be as thin as a credit card, too. Isn't the Raspberry Pi credit card sized too?

rpi are, and always have been a little bigger (and much taller) than credit cards. more like altoids tin

Re: 486Tang – 486 on a credit-card-sized FPGA board

#37
post #20
post #19

Earlier quoted context omitted.

Didn't they have the F00F bug? (Thanks, I keep misremembering) How much more Pentium do you want?

No, the Quarks did not have the f00f bug, that would have been funny though.

Didn't they have issues with `LOCK CMPXCHG`(not the 8B)? This is out of my depth and I am not sure, but it sounds similar to the f00f bug.

1: https://en.wikipedia.org/wiki/Intel_Quark#Segfault_bug

Re: 486Tang – 486 on a credit-card-sized FPGA board

#38

Silly question. Are there any 486-compatible small CPUs that could be embedded into a project instead of using an FPGA? Given that AMD, Intel and others have the ability to make 486-compatible processors currently, I would have thought you could just buy a CPU or SoC to run 486 code.

Define "486-compatible." As far as I know even intel's newest cpus can run 486 era 16-bit stuff in hardware. But, a plain answer: Via Eden boards. still use north/southbridge architecture, and are from the mid 2000's. It's just modern Windows/Linux that have discontinued the ability. Or, perhaps you have 16/32 and 32/64 and are unable to do 16bit on 64bit machines- which still boils down to "operating system." By far…

In Windows, once you're in long mode, there's no 16-bit available to you. You can instead take the DOSBox or other VM route.

Linux isn't really relevant given the time frame.

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