Re: PcChips sucks!

Posted on 2017-10-18, 18:09

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Did you ensure that the EDO sticks are 5 V and not 3.3 V? Did you try using FPM sticks? FPM works best in 486 boards. If I recall correctly, the M919's BIOS has a CMOS tick box option for EDO RAM. Did you set this? yea changed that setting in bios, and its a no go, only 1 stick of ram works, if i …

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Re: PcChips sucks!

Posted on 2017-10-18, 06:15

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Did you ensure that the EDO sticks are 5 V and not 3.3 V? Did you try using FPM sticks? FPM works best in 486 boards. If I recall correctly, the M919's BIOS has a CMOS tick box option for EDO RAM. Did you set this?

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Re: Cache Chips/SRams and the "China Syndrome"

Posted on 2017-10-14, 21:42

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

White SRAM DIP sockets - now that is deviant! Anyway, I highly recommend getting an SRAM tester. It can be extremely difficult to single-out the bad SRAM modules without one. You are just asking for frusturation without one. A lot of the EEPROM programmers also have SRAM testers are part of their …

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Re: The World's Fastest 486

Posted on 2017-10-14, 13:11

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If you aren't doing the PS/2 mouse mod, then you should use the BIOS I've attached here.

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Re: Zida 4DPS (Tomatoboard) Socket 4 SiS PS/2 mouse not working

Posted on 2017-10-14, 05:48

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Best of luck with the trade - I will be surprised if that trade goes through.

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Re: Zida 4DPS (Tomatoboard) Socket 4 SiS PS/2 mouse not working

Posted on 2017-10-14, 03:45

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, I see Amstrad PC1512 computers on eBay right now, so it seems like an unlikely trade.

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Re: Zida 4DPS (Tomatoboard) Socket 4 SiS PS/2 mouse not working

Posted on 2017-10-14, 03:20

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That's pretty messed up. I wouldn't classify him as a 'friend'.

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Re: The World's Fastest 486

Posted on 2017-10-13, 23:37

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Are you planning on adding the PS/2 mouse function? This BIOS is really only of interest if you intend to add native PS/2 mouse support. It should work even if you do not add the PS/2 mouse support though. There are probably some settings I've unhidden and set defaults optimal for my system. For …

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Re: Zida 4DPS (Tomatoboard) Socket 4 SiS PS/2 mouse not working

Posted on 2017-10-13, 17:30

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Some local collector was interested in making a deal, but seems to be holding out for a little bit more right now. Last time I negociated a V5 5500 AGP + a Yamaha SW20-PC + a tualatin 1400 cpu for his 133MHz Cyrix - he seemed excited at first, but I haven't heard from him in a while due to my …

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Re: Zida 4DPS (Tomatoboard) Socket 4 SiS PS/2 mouse not working

Posted on 2017-10-13, 07:28

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, the latest Biostar BIOS worked on my original version MB-8433UUD. Try running your board at 33 MHz and adjust the CMOS settings. I'm pretty sure that chips marked as Cyrix 5x86-120/4x were originally meant to be Cyrix 5x86-133/4x chips, but they failed to qualify at 133 MHz. So the 120/4x …

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Re: Zida 4DPS (Tomatoboard) Socket 4 SiS PS/2 mouse not working

Posted on 2017-10-13, 02:43

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, the latest Biostar BIOS worked on my original version MB-8433UUD. Try running your board at 33 MHz and adjust the CMOS settings. I'm pretty sure that chips marked as Cyrix 5x86-120/4x were originally meant to be Cyrix 5x86-133/4x chips, but they failed to qualify at 133 MHz. So the 120/4x …

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Re: Zida 4DPS (Tomatoboard) Socket 4 SiS PS/2 mouse not working

Posted on 2017-10-13, 01:14

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

486 boards were still sold new in 1999 in N. America as well. I recall seeing the PC Chips M919 being sold without the cache for $99. How did the LS486e BIOS workout on the 4DPS? You might need to modify the LS486e BIOS using modbin to allow for the PS/2 mouse. There is a checkbox you need to tick. …

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Re: Zida 4DPS (Tomatoboard) Socket 4 SiS PS/2 mouse not working

Posted on 2017-10-12, 08:08

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Interesting about the Cyrix 5x86-133/4x. That's the first instance I've heard of an OEM using these CPUs. It is possible that your motherboard doesn't properly support the POD in write-back mode. Many 486 boards do not. The early revision of your MB-8433 may be why you are having mouse issues. You …

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Re: Zida 4DPS (Tomatoboard) Socket 4 SiS PS/2 mouse not working

Posted on 2017-10-11, 23:41

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

With identical hardware, the SiS 496/497 shouldn't really perform worse than boards with the UMC 8881/8886. In fact, it should be marginally faster. You may have the system configured a little differently, see for example, http://www.vogons.org/viewtopic.php?f=46&t=33685 I would suggest running the …

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Re: Zida 4DPS (Tomatoboard) Socket 4 SiS PS/2 mouse not working

Posted on 2017-10-11, 16:31

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The issue I have with the 4DPS is that it can only accept single-banked cache, so it is unlikely that you will be able to get the L2 cache timings stable at the fastest settings when using a 40 MHz FSB, this is especially true when using a Cyrix 5x86-120. You might have better luck with an AMD X5- …

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Re: Zida 4DPS (Tomatoboard) Socket 4 SiS PS/2 mouse not working

Posted on 2017-10-11, 15:13

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The mouse header pins on the MB-8433UUD and the 4DPS are very different. MB-8433UUD PIN Assignment 1 Data 2 N/C 3 GND 4 Vcc 5 CLK 4DPS PIN Assignment 1 CLK 2 Data 3 GND 4 N/C 5 Vcc On the MB-8433UUD, the chipset controls the PS/2 mouse (the chipset contains a keyboard controller chip). On the 4DPS, …

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Re: Zida 4DPS (Tomatoboard) Socket 4 SiS PS/2 mouse not working

Posted on 2017-10-11, 13:07

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes, works fine for me. You must use a keyboard controller IC which supports PS/2 mice. Look up the spec sheet for yours. Perhaps the previous owner swapped keyboard controller chips.

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Re: ET4000AX ISA vs CL-GD5428 VLB

Posted on 2017-10-06, 23:53

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

But the image quality of the 8900D is pretty poor in comparison to the others.

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Re: ET4000AX ISA vs CL-GD5428 VLB

Posted on 2017-10-06, 19:55

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by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

From the results Phil presented, it seems that for a 1x 486DX, that there isn't much benefit of VLB over ISA, but the divergence is more dramatic for a 2x, or clock-doubled, 486DX2. Also, don't forget about the ISA Cirrus Logic GD-5434. I think this was the end of the line for ISA Cirrus Logic cards …

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Re: AWE64 heat and audio issues

Posted on 2017-10-05, 18:42

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Since the card seems to sorta function, might try inspecting the card for a short, even nearly invisible minuscule tin whiskers can cause a short.

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