Re: The Ultimate 486 Benchmark Comparison

Posted on 2020-12-27, 04:35

by

by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

feipoa wrote on 2020-12-27, 03:57: From what I understand, normally the front-side bus clock rate is at or around 33.3333 MHz, so more like 99.9999 MHz. People tend to round out the decimal places. It always makes me think of an LP record.

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Re: DOS UDMA

Posted on 2020-12-13, 17:49

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by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There is a common API implemented by most memory managers called "VDS" (virtual-mode DMA specification), but it adds a lot of complexity to the quite simple IDE implementation in the BIOS and adds a dependency from the BIOS to the memory manager. It seems BIOS writers were reluctant to implement …

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Re: Help me find what mother board I had back in 1999.

Posted on 2020-12-05, 22:24

by

by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If the shop had a website maybe you can find it on archive.org and see if they leaned toward a particular brand. For example, on near me was AOpen for everything.

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Re: PC Chips M912 BIOS update for Am5x86 and Cyrix 5x86

Posted on 2020-12-05, 03:40

by

by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Should be able to jumper it as an Enhanced Am486DX2-66, or do it first as an Am486DX4-100, and then figure out which jumper is the multiplier and change it once you get it running as a DX4-100 first. The v1.4 is an odd one with original BIOS, according to Amptron it does not support the AMD DX4's …

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Re: PC Chips M912 BIOS update for Am5x86 and Cyrix 5x86

Posted on 2020-12-05, 01:17

by

by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Should be able to jumper it as an Enhanced Am486DX2-66, or do it first as an Am486DX4-100, and then figure out which jumper is the multiplier and change it once you get it running as a DX4-100 first.

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Re: Wanted to share my ultimate Pentium 1 system

Posted on 2020-11-27, 23:45

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by jakethompson1

in Marvin \ System Specs

in Marvin \ System Specs

Thanks for the info on the graphics chip guys. Luckily I have my Pentium 3 with Voodoo card for 3D accelerated games, so I will keep this machine just for 2D games. Right now I am having an issue with the original 8 speed cd-rom drive not being recognized. I understand I need Windows to install the …

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Re: Cache woes. Is it Faulty or is it the Motherboard being spastic?

Posted on 2020-11-27, 18:05

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by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If you *really* want to try the 64K chips just make sure you have the right tools, between removing 8 chips and inserting 8 chips something is bound to go wrong otherwise... did you try swapping two of the cache chips as mentioned? it would be interesting to see if you can get the last digit in the …

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Re: Cache woes. Is it Faulty or is it the Motherboard being spastic?

Posted on 2020-11-27, 00:34

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by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It could be a line form cache or memory losing connectivity, signal is lost sometimes and not others. If you had a external programmer like a tl866 you could check the cache chips direct and rule them out I was going to suggest that, but I had a similar issue to this where all four chips passed the …

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Re: Cache woes. Is it Faulty or is it the Motherboard being spastic?

Posted on 2020-11-26, 23:47

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by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You could try swapping the U12 and U24 cache chips and see if that changes anything.

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Re: Cache woes. Is it Faulty or is it the Motherboard being spastic?

Posted on 2020-11-26, 23:05

by

by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If you reboot say 10 times and keep track of the address where it fails, what digits does the address end in? Looks like 4 in both your screenshots. This might be able to tell you which cache chip is bad

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Re: Cache woes. Is it Faulty or is it the Motherboard being spastic?

Posted on 2020-11-26, 04:57

by

by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You're super sure on the turbo? Maybe put a spare jumper cap over the turbo connector and boot with that? Those cachechk speeds are deplorable. It has nothing to do with megabyte 3 in particular.

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Re: Windows 98 and DOS Question

Posted on 2020-11-26, 04:52

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by jakethompson1

in Marvin \ Software

in Marvin \ Software

Also I know I had this answered in another thread but I wanted to go more into the CuteMouse program for DOS, is it for pure DOS or MS-DOS, also how do I run it, I think there is an AUTOEXEC file in the bin folder of the program so do I edit the sys config and set that as a launch program. Like I …

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Re: How does one setup booting from LAN exactly?

Posted on 2020-11-26, 02:12

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by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Doesn't one of the variants of XT-IDE BIOS support booting over a serial port?

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Re: Recommendation 386-k6-3 era motherboards that are compatible with modern cases?

Posted on 2020-11-26, 02:10

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by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If you have a full ATX case you should be able to fit a Baby AT motherboard in it with two complications: You'll either need to do without an I/O shield, try and find a premade one, drill a hole for the keyboard port in a blank one, or 3D print one Because AT cases had 8 slots, and ATX has 7, you'll …

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Re: How to slow down NEC V20?

Posted on 2020-11-26, 01:55

by

by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi! Thanks a lot for all of your help and sorry for the delay. - I've wanted to program a new EPROM (2764 ?) and try it in my XT first, before posting back.. But unfortunately, I was totally busy because of a birthday party, so I hadn't been able to post back. Anyway, I think I can try it in the …

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Re: 3d printed Heatsink&Fan Mount for Socket 3/5/7 ?

Posted on 2020-11-22, 01:56

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by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well take a look at my icon. I'm using an ATS BGA heatsink (45mmx45mm) along with a custom 3d printed bracket I made for it to clip onto.

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Re: How to slow down NEC V20?

Posted on 2020-11-22, 01:55

by

by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Jo22 wrote on 2020-11-13, 09:53: Thanks for the information! 😀 Did you get anywhere with this?

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Re: Jumpers for 586-160Mhz? (plus how to get DOS to boot with it...)

Posted on 2020-11-21, 04:04

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by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Oh also, I'll add to double check your jumpers and make sure you didn't mess up anything with regard to the Am5x86-133 being a write-back SL-enhanced CPU.

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Re: Jumpers for 586-160Mhz? (plus how to get DOS to boot with it...)

Posted on 2020-11-21, 04:03

by

by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello! I'm also running two Am5x86-133s at 160. They were not stable with the 3.3 V setting on the board. I never actually tried disabling L1 though (which will make it slower than it is at 133). What I did have to do is increase the voltage. Technically the Am5x86 datasheet I'm reading says 3.3V …

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Re: Compact Flash and Bios Shadowing (Micronics DXLB/Gateway2k 486DX2V)

Posted on 2020-11-16, 00:45

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by jakethompson1

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It isn't clear with the CF whether the bios locks up and won't boot at all or if you can still boot from floppy. In any case you could boot from a DOS disk with debug on it (e.g. DOS 6.22 disk 1) and compare the location of the FDPT in the four combinations (CF vs. HDD & shadowed or not). To dump …

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