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Re: 486 SX 16 & 20 MHz

Posted on 2019-10-29, 11:08

Yes. They had some sort of open ended partnership where AMD will continue to have access to Intel’s product line (for hefty royalties) if Intel accepted some other AMD products in return. At one point Intel though it is not really working for them and deliberately stopped accepting AMD products ( …

Re: 486 SX 16 & 20 MHz

Posted on 2019-10-29, 08:41

It's not similar at all. Intersil/Harris actually licensed the 286 and obtained the chip designs from Intel, so they are legal. Intel never licensed the 386, and as such it did not give any chip designs to any third party at all. AMD had to reverse-engineer the Intel 386 and create their own ( …

Re: 486 SX 16 & 20 MHz

Posted on 2019-10-28, 21:47

In "my area" I hardly remember seeing a 386 chip that was made by Intel. That would be very odd, given that Intel has been supplying 386 CPUs since 1985, and AMD only from 1991 onwards. Well, I got my first PC in 1991. Perhaps that's why :). I was a 8bit user before that. However, I suspect I’d see …

Re: 486 SX 16 & 20 MHz

Posted on 2019-10-28, 15:37

Well, in my area I didn't see the 386DX-40 until the 486DX2-66 was already becoming a common computer. 486DX2-66 a common computer? When was that. Like in 1993, 1994, 1995? In "my area" I hardly remember seeing a 386 chip that was made by Intel. Perhaps even more so for 286 chips maket which was …

Re: 486 SX 16 & 20 MHz

Posted on 2019-10-28, 14:29

Well, Am386 (and for a moment forget if SX, DX or -40) wasn't a niche product. AMD sold tons of them. One milion units between March - October 1991, which was a lot back then. And I bought one too! :) Don't forget the context. In early 1991 hardly anyone was buying 486. It was ludicrously expensive …

Re: 486 SX 16 & 20 MHz

Posted on 2019-10-28, 13:32

And in fact they did both. In July 1991 they lowered the price of DX-33 from the original $1056 to $445. Surely the chip cost them just as much to make in June 1991 as in July 1991. And they introduced SX at the same time. Why? Because of competition. 1991 was the year of introduction of Am386 (it …

Re: 486 SX 16 & 20 MHz

Posted on 2019-10-28, 13:05

I believe in 1991 it was simply a good time to have a cheaper 486 product. I think these two statements contradict eachother somewhat. Early 486SX CPUs actually did contain the FPU, so they were technically the same die as a 486DX. Which means they weren't cheaper to produce. Given that they'd also …

Re: 486 SX 16 & 20 MHz

Posted on 2019-10-28, 10:19

Isn't great that in 2019 people are still being fascinated that some 486SX's may contain a real FPU :) Personally I think that although there is enough evidence that the FPU is physically there in early SX units (and absent in some later chips) I am not so sure it was the way of dealing with broken …

Re: 486 SX 16 & 20 MHz

Posted on 2019-10-27, 21:14

IIRC, the PX486P3 board had undocumented jumper settings for 16 and 20MHz. I'm sure some other boards also have such undocumented settings. Actually this was a great idea. Thanks! I noticed that on one of my motherboards there is UM9515-1 clock generator. Removing all clock jumpers switched it to …

Re: 486 SX 16 & 20 MHz

Posted on 2019-10-27, 13:14

Does a 386DX-40 beat a 486SX-16? But lose to the 486SX-20? You don’t see many benchmarks for those systems. This is actually what I would like to experimentally prove. I expect that the 486SX 16 MHz should beat 386DX-33 and the 486-SX 20MHz shouldn't have any problem beating 386DX-40. Most 386 DX …

486 SX 16 & 20 MHz

Posted on 2019-10-27, 10:49

Got these two babies. I was wondering if there is a regular (non-OEM) motherboard that can drive these at 16 or 20 MHz. All my 486 motherboards start at 25 MHz. I was thinking using an older 486 motherboard and replacing the crystal. But hope there might be a better way... https://i.imgur.com/ …

Setting Display Refresh rate - Windows 3.1 & S3

Posted on 2019-10-25, 20:45

in Marvin \ Video
It's been long time since I used Windows 3.1. I forgot how to set display refresh rate in Windows 3.1. I have following PCI VGA cards driving my LCD display: Diamond S3 Vision 964 Generic S3 868 Generic S3 Trio84V+ card When I am using the first card, the Diamond drivers came with a Diamond GUI tool …

Re: Which 486 board

Posted on 2019-10-20, 21:03

Manual for the ATC-1442G: http://www.elhvb.com/mboards/a-trend/1442g/index.html That helped. Thanks! Am5x86 generally works with Am486DX4-WB settings, but Cx5x86 tends not to work at all if not explicitly supported. Which CPU are you intending to use here? The Cx5x86, Am5x86 or that PODP-83 (which …

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