Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?
Posted on 2011-02-20, 22:35
Another one to think about - what's the bus and multiplier of the 133? 😉 Don't you mention something strange?
Re: Just won an AMD K6 3/450 rig off ebay!
Posted on 2011-02-21, 01:28
I sense the addiction kicking in. 🤣
Re: Just won an AMD K6 3/450 rig off ebay!
Posted on 2011-02-21, 01:30
How many times have you heard.... I'd thrown a ton of this stuff away years ago that I'd been given for free! 🤣
Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?
Posted on 2011-02-21, 04:49
Antinomy wrote: Another one to think about - what's the bus and multiplier of the 133? 😉 Don't you mention something strange? Isn't that just 33Mhz and x3?
Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?
Posted on 2011-02-21, 10:50
33*3 = 100, my friend 😀 It's the frequency equation for Cyrix 5x86 100. For 120 it's 40*3. For 133... 😉
Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?
Posted on 2011-02-21, 12:49
In case someone wondered why 33x3 isn't 99, it's because the frequency is actually 33.33333333... or 66.666666666 or 99.99999999....
Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?
Posted on 2011-02-21, 12:50
33*3 = 100, my friend Happy It's the frequency equation for Cyrix 5x86 100. For 120 it's 40*3. For 133... Wink I'm sure that he thought about 4x33MHz = 133MHz. 486 motherboard specification does not provide 4x external multiplier. To overcome this limitation, CPU producers created internal …
Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?
Posted on 2011-02-21, 13:11
33*3 = 100, my friend Happy It's the frequency equation for Cyrix 5x86 100. For 120 it's 40*3. For 133... Wink I'm sure that he thought about 4x33MHz = 133MHz. 486 motherboard specification does not provide 4x external multiplier. To overcome this limitation, CPU producers created internal …
Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?
Posted on 2011-02-21, 14:29
Well, 4x multiplier makes sense. But I don't remember it being hardware strap available. The last sentence should be read as "there's no way to set jumpers to start it with a 4x multi". Cyrix 5x86 has only 2x and 3x available by h/w straps while 1x and 4x can be set only by software. Meaning a BIOS …
Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?
Posted on 2011-02-21, 15:34
The last sentence should be read as "there's no way to set jumpers to start it with a 2x multiplier because in this case it works always as 4x multiplier". (:
Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?
Posted on 2011-02-21, 21:09
Really? That turns things the other way. Can anyone suggest a 486 board with PCI, good memory performance?
Re: Just won an AMD K6 3/450 rig off ebay!
Posted on 2011-02-21, 22:39
nice my retro box is almost the same... it's actually a K6-III 450 but running at 400... it's not on a super 7 board and I was too pissed off at the time to buy a super 7 board (I got my Shuttle HOT-569 motherboard 3 months before super 7 was out! after a bad BIOS flash bricked my AZZA Tomato board …
Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?
Posted on 2011-02-22, 00:15
Is there a complete list anywhere of 486 boards with this chipset?
Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?
Posted on 2011-02-22, 09:52
You ´could´ try TH99, or download the full version and do a search for the exact chipset from Windows. It´s the best `full` collection of 486 data that I know of.
Re: Just won an AMD K6 3/450 rig off ebay!
Posted on 2011-02-22, 09:54
PeteUK, you didn´t mention what board you´re using :D And if you post a pic of the graphics card (from and back, detailed enough so we can read the printings), we might be able to figure out more info on your graphics card. Often you can even recognize the type of graphics chip by looking what the …
Re: Just won an AMD K6 3/450 rig off ebay!
Posted on 2011-02-22, 09:55
Imma wait until it gets here, seller didn't specify certain bits, so pics and more info to come! 😁
Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?
Posted on 2011-02-22, 11:48
Ehr, one problem - there's quite a number of boards which chipset is marked as unknown there. Guess, we need to stack our power and make a better database 😉
Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?
Posted on 2011-02-22, 12:20
You ´could´ try TH99, or download the full version and do a search for the exact chipset from Windows. It´s the best `full` collection of 486 data that I know of. That collection isn't searchable and chipsets aren't mentioned for the vast majority of the boards so even searching manually isn't …
Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?
Posted on 2011-02-22, 12:53
Didn't see such a thing in the Web. Yet again, Tetrium know quite a number of oldschool lovers, so we can make our pretty own database. Some info can be taken from the Web and some - from our own hardware.
Re: UMC chipset PCI 486 mobo. AMD P90 CPU options?
Posted on 2011-02-22, 13:15
There is a better way -> just put this into Google search (: site:http://www.artofhacking.com/th99/ "Chip Set"+"UMC"+"32-bit PCI"
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