Re: Getting the AGP HD4650 to do hardware flash acceleration on Win Xp
Posted on 2017-10-31, 00:34
I'm using the HD4350 in XP on an Opteron 2.6 GHz. I'd be interested if you can figure this out.
Re: PcChips sucks!
Posted on 2017-10-30, 17:48
On the weekend i tried the very same PCCHIPS m919 motherboard with the same PSU, same memory, and the same vga pci card. it boots, and now it detects the memory correctly 16MB. These motherboards are a lottery Then today i tried to boot it again, it hanged at the first boot screen that says the …
Re: Stealth64 DRAM T VLB Trio64 86c764-P vs. 86c764X
Posted on 2017-10-30, 17:26
Do you think BIOSes from non-Diamond branded VLB 764-P cards will work on the Diamond card?
Re: Stealth64 DRAM T VLB Trio64 86c764-P vs. 86c764X
Posted on 2017-10-30, 09:20
Does anyone happen to have BIOS version 2.02 (found on 764-P cards) and version 2.09 BIOS (found on 764X cards)? If so, I can try them in my Trio64 VLB. Another thought - would a 764X BIOS found on PCI cards be the same as that on the VLB version (Diamond Stealth 64 DRAM T)?
Re: Cyrix 386-to-486 upgrades use fast integer multipliers
Posted on 2017-10-27, 07:47
Excellent. Looks like the chip on the left is a 7-stage ripple counter, and the one on the right is a quad 2-input NAND gate. I know the NAND gate is used to make the flush circuit. I assume the counter some how benefits the flush circuit. I've put together this flush circuit and tested it on my …
Re: Cyrix 386-to-486 upgrades use fast integer multipliers
Posted on 2017-10-27, 06:47
Ahhh, I've seen those on some 386 upgrade website. I forget the website now. I think that circuit is added for increased compatibility. Perhaps it is the NAND-based inverter flush circuit? Do you have the part numbers on those ICs? The CPU looks like the standard 5 V variety.
Re: Cyrix 386-to-486 upgrades use fast integer multipliers
Posted on 2017-10-27, 00:43
I did not see any way to download the PMIPS benchmark that you linked. Passmark has specific tests for add/sub/mul/div. Do you have a photo (top and bottom) of your SXL2-50 on interposer? The ceramic SXL2-50 I own can only work up to 55 MHz reliably. I wouldn't even want to run these at 33 MHz …
Re: Cyrix 386-to-486 upgrades use fast integer multipliers
Posted on 2017-10-26, 19:38
Oh nice, where did you score a DRx2-66 from? I bought mine from a collector many years back, a collector who was down-sizing. The 486SXL2 isn't all that much faster than the DRx2. I uploaded some results somewhere on here. I think it was around 5%-7%. I'm thinking something like Passmark might show …
Re: Cyrix 386-to-486 upgrades use fast integer multipliers
Posted on 2017-10-25, 09:44
Phil performed some tests on the Cyrix CPU's - refer http://www.philscomputerlab.com/cyrix-486dlc.html Based on my own benchmark tests, I came up with basically the same results (this was on motherboard that directly supported the Cyrix 486DLC and that allowed me to either enable or disable the L1 …
Re: Cyrix 386-to-486 upgrades use fast integer multipliers
Posted on 2017-10-25, 07:10
Ya, really makes you wonder if the "up to two times faster" is simply due to the 2x multiplier. For the comparison, the idea would be to use an ordinary 486DLC. I think the main difference between the DRx2 and the DLC is the 2x multiplier and the built-in cache coherency circuit. But perhaps there …
Cyrix 386-to-486 upgrades use fast integer multipliers
Posted on 2017-10-25, 02:29
http://www.fermimn.gov.it/inform/materiali/evarchi/cyrix.dir/upover.htm On the above-referenced website, the following is mentioned, Fast integer multiplier. The hardware integer multiplier calculates up to eight times faster than the software multiply functions of 386 and non-Cyrix 486 processors …
Re: need help with 486 motherboard
Posted on 2017-10-24, 21:41
Ahh, that makes sense.
Re: need help with 486 motherboard
Posted on 2017-10-24, 01:49
Fascinating motherboard. It contains the UM8881F/UM8886F chipset from mid-1994. I have only seen the UM8881AF/UM8886AF and UM8881BF/UM8886BF chipsets. Is the socket next to the BIOS socket for a RTC module? I don't see any battery holder on the board, nor a barrel battery.
Re: Pentium vs Cyrix 6x86 in Integer 3D games
Posted on 2017-10-24, 01:22
How will you take the fps results from games with a frame counter, like simply moving forward at the start of the game and jotting down an instantaneous frame rate?
Re: So I had a stupid idea about how to build a really fast 486...
Posted on 2017-10-22, 00:00
PC100- and Cyrix 5x86-based systems do exist. You can use a ECS_P5GX-M, for example, with a Cyrix MediaGX CPU. The Cyrix MediaGX integrated the memory controller into the CPU, among other things. The FSB of the MediaGX is still 33 MHz, just as on socket 3 motherboards. Unfortunately, the performance …
Re: PcChips sucks!
Posted on 2017-10-21, 18:51
Love to - but earliest will be late November as I have to update the eeprom of the HOT433(via network card) and wait for the Alliance cache rams. I have even tested the HOT433@60mhz fsb with a 50ns FPM module and it ran slower than with an EDO module. A fsb of more than 50 was not really that …
Re: PcChips sucks!
Posted on 2017-10-21, 10:54
Interesting. Could you provide some benchmark evidence of the HOT433 running faster with EDO compared to FPM when identical wait states are used?
Re: PcChips sucks!
Posted on 2017-10-20, 23:01
It may be a faulty comparison but on my HOT433 board the 8881 ... -BCO version has been running fine with EDO. I have also run into this, but was unable to draw any general conclusions. For a particular set of sticks of RAM I tried at one point, a certain EDO module seemed to work best on my …
Re: PcChips sucks!
Posted on 2017-10-20, 22:57
Yep, my M919 doesn't support EDO either, only FPM, and even then it's picky. Also can't get serial ports to work on it, and it's not playing nice with a controller card. Otherwise it's perfect :wink: yea there is a lot of info on this site about that: http://leileilol.mancubus.net/486/m919.html " …
Re: PcChips sucks!
Posted on 2017-10-18, 19:32
Very few 486 motherboards, including the late PCI ones, work well with EDO RAM. Before expending further discussion on this, you should obtain some conventional FPM memory, preferably 32 MB or less per module. Module pairing is not required. There is no speed benefit from EDO on these motherboards. …
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