Re: Help wanted --> ALI M1429/M1429G : Need peoples with M1429 board that have a BIOS for adult to dump chipset register

Posted on 2023-04-04, 18:04

by

by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I downloaded the Award BIOS 2.0 for the A-Trend 1762 from The Retro Web, I will try to dump the setup table from it, which should directly yield a mapping of CMOS options to chipset bits. Great, that should speed the thing up if that work! Thanks I found the following settings: 12 10: Hidden …

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Re: Help wanted --> ALI M1429/M1429G : Need peoples with M1429 board that have a BIOS for adult to dump chipset register

Posted on 2023-04-04, 17:06

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by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

mkarcher wrote on 2023-04-04, 16:45: I downloaded the Award BIOS 2.0 for the A-Trend 1762 from The Retro Web, I will try to dump the setup table from it, which should directly yield a mapping of CMOS options to chipset bits. Great, that should speed the thing up if that work! Thanks

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Re: Overclocking a TI486DX2

Posted on 2023-04-04, 16:35

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by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

4 - If I control-alt-del, the system reboot and do the whole bios post thing (about as much time as if I press reset). But unlike with the reset button, the registers change I did for the memory stay patched... Cool. Then you can try memtest 4.10 too Yes. So far I removed my extra ram and it fixed …

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Help wanted --> ALI M1429/M1429G : Need peoples with M1429 board that have a BIOS for adult to dump chipset registers

Posted on 2023-04-04, 15:51

by

by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi there. I began a project to document what register do what on Ali M1429/G chipset in hope to make an utility to allow setting the different parameters missing in many board BIOS (like the Acer one, having no option to adjust memory or cache setting whatsoever). Here the initial topic on where I …

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Re: Overclocking a TI486DX2

Posted on 2023-04-04, 13:40

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by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think I got an idea that should allow me to reverse engineer that way better than playing the poking random registers. I already made a program that scan all register and print them on screen. So what I need now is people with motherboard with M1429 or M1429G. Then have them: 1 - boot the computer …

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Re: Overclocking a TI486DX2

Posted on 2023-04-04, 13:31

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by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

3 - Jumper JP12 must be positioned depending of what the bus is running at. one position for 25/33 and one for 40/50 Many 486 boards have a jumper like that, especially if they have VL slots. There is a pin on the VL slot that is intended to inform cards whether they got 1 clock cycle to claim a …

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Re: Overclocking a TI486DX2

Posted on 2023-04-04, 06:48

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by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Update: I did some more tests. 1 - For the register 0x1d, it have a big diminishing return. While it boost the memory speed quite enough on a 33fsb (enough so the read speed is about as fast as the L2), on 40fsb, the difference is a lot less. And on 50fsb, except for crashing the system most of the …

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Re: Overclocking a TI486DX2

Posted on 2023-04-04, 00:52

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by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So far, in speedsys:: Test fsb33 cpu 66mhz Doing bruteforcing of the register 0x1d ("Reserved" according to M1489 doc) Memory Bandwidth = 62 -> 99.34 MB/s Data cache L1 = 48.20 -> 51.61MB/s Data cache L2 = 34.02 -> 37.44MB/s Memory throughput = 23.69 -> 31.24 7zip benchmark = 13/12/12/217/18/18 -> …

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Re: Overclocking a TI486DX2

Posted on 2023-04-03, 21:48

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by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Disruptor wrote on 2023-04-03, 21:38: Will you make a .cfg for ctchip? 😉 Yes, If I can get it working

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Re: Overclocking a TI486DX2

Posted on 2023-04-03, 21:48

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by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here are the documentation : https://stason.org/TULARC/pc/motherboards/A/ACER-INC-486-ACERMATE-486-G-A1GX-2.html Note that 50Mhz fsb is not on the documentation nor on the board silkscreen, found it by mistake because the 40mhz jumper setting was corroded and not making contact initially (JP11 not …

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Re: Overclocking a TI486DX2

Posted on 2023-04-03, 21:33

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by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I did peek into a [different] acer chip datasheet that I found : http://66.113.161.23/~mR_Slug/pub/datasheets/chipsets/ALi/M1489-2.pdf And I disassembled the BIOS. I can confirm that the Lock Register stuff is the same (page 37 of said datasheet). And see no trace of messing with index register 1Bh, …

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Re: Overclocking a TI486DX2

Posted on 2023-04-03, 19:11

by

by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok, then you may give c't chip a try. ftp://ftp.heise.de/pub/ct/ctsi/ctchip34.zip Wait, I don't see that it has support for the ALI 1429 ??? Right, no Ali chipset on there. It can only read some of the cyrix cpu registers. I also checked other solutions like mrbios. (Same, no support for ALI M1429G …

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Re: Overclocking a TI486DX2

Posted on 2023-04-03, 18:49

by

by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Your memory performance looks like you have used autoconfig in BIOS, haven't you? That's the only choice with that board. There is no option to adjust memory. I plan to try to fix that eventually (when I get a eprom program plus some eprom that fit... Find board with same chipset and try them, I …

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Re: Overclocking a TI486DX2

Posted on 2023-04-03, 17:46

by

by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Your memory performance looks like you have used autoconfig in BIOS, haven't you? That's the only choice with that board. There is no option to adjust memory. I plan to try to fix that eventually (when I get a eprom programer plus some eprom that fit... Find board with same chipset and try them, I …

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Re: Overclocking a TI486DX2

Posted on 2023-04-03, 17:46

by

by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Your memory performance looks like you have used autoconfig in BIOS, haven't you? That's the only choice with that board. There is no option to adjust memory. I plan to try to fix that eventually (when I get a eprom program plus some eprom that fit... Find board with same chipset and try them, I …

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Re: Overclocking a TI486DX2

Posted on 2023-04-03, 17:08

by

by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

40 Mhz seam to give no real advantage over 33 (because of the memory drop) 50 Mhz, Maybe I should just use that and forget about the cache... Until I can get a DX4+ Will take the board out tonight and see if I can measure something between B14 and VCC while the CPU is on the board, and if so, Will …

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Re: Overclocking a TI486DX2

Posted on 2023-04-03, 17:04

by

by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

100Mhz(50fsb) Filename IMG_20230403_103257146.jpg File size 429.61 KiB Views 1035 views Filename IMG_20230403_103625735.jpg File size 405.67 KiB Views 1035 views Filename IMG_20230403_103858583.jpg File size 320.71 KiB Views 1035 views

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Re: Overclocking a TI486DX2

Posted on 2023-04-03, 17:03

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by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

80Mhz(40fsb) Filename IMG_20230403_102325433.jpg File size 427.82 KiB Views 1035 views Filename IMG_20230403_102748864.jpg File size 438.74 KiB Views 1035 views Filename IMG_20230403_103101336.jpg File size 315.8 KiB Views 1035 views

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Re: Overclocking a TI486DX2

Posted on 2023-04-03, 17:02

by

by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The complete model I have is the TI486DX2-G66-GA. It is 3.45v so maybe there is hope, going to do more research tomorrow... Ah, it's a DX4 backport then. Then I do not wonder why it runs with 50 MHz FSB at all. Perhaps it was binned down to DX2-66 because some tests at 100 MHz have failed (1st …

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Re: Overclocking a TI486DX2

Posted on 2023-04-03, 06:12

by

by Rav

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi there. I know my Cyrix 486 DX2 can do 100Mhz (it work fine with a 50Mhz FSB). But when I do that, I lose the cache. I was wondering if I can change the multiplier. The motherboard I have have no such control but from what I understand, I have to solder I wire on the socket between pin B14 and …

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