BitWrangler wrote on 2022-02-06, 06:04:

If all bigger than 8.4GB then 8.4GB BIOS limit, if all bigger than 27GB then 27GB limit...

That sucks. THe old drive was 2 gigs or so but it died.

my 486 can take a 40 gig HDD but only use 500 megs.

annoying.

Law212 wrote on 2022-02-06, 06:11:

That sucks. THe old drive was 2 gigs or so but it died. […]
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BitWrangler wrote on 2022-02-06, 06:04:

If all bigger than 8.4GB then 8.4GB BIOS limit, if all bigger than 27GB then 27GB limit...

That sucks. THe old drive was 2 gigs or so but it died.

my 486 can take a 40 gig HDD but only use 500 megs.

annoying.

What size are the drives you are trying to use?

You may check ultimate retro for the latest bios version for your board,

https://www.ultimateretro.net/en/

also check jan’s website for a version (if he has it use his)

http://web.inter.nl.net/hcc/J.Steunebrink/k6plus.htm

If you still have issues, he is user Chkcpu on here and may make one for you if you ask nicely 😀

His patches and newer bios versions can add support for up to 120gb hard drives and k6 3+ cpus

By the way, did we ever get a definitive model number and manufacturer for your board? If not, please post it. Also, may want to add that to your original post via edit.

This is the model number
KM-T5-V3+ Rev 3

Okay, going back and looking at your pics much closer (which were at weird angles) I can see that your vrm area has only one mosfet) this means that despite possibly saying socket 7 it’s actually for all intents and purposes a socket 5 (we may have noticed sooner with a good model number and good pics earlier on. Sorry)

Anyway, unless you come up with a powerleap adapter you are probably going to be stuck with limited options:

The best one that comes to mind is the pentium mmx overdrive 200mhz of which a few are on ebay at the moment. Though, at frankly dreamer prices.

Also, basically I think any winchip will work on this, including I believe a 266? (Would have to look it up and confirm 3-3.3.5vcore)

But that’s about it. You can forget properly running a pentium mmx on this board or most of the k6 lineup that doesn’t specifically list core voltage as over 3v (166, 200, 233 I think are the 3v models). (A k5 200 or lower should be good to go though.)

Last I looked there was a powerleap on ebay under “multimedia cpu upgrade” again though, dreamer pricing.

Your cheapest route to a faster system is a new board I’m sorry to say. But this isn’t the end of the line for this one, with a power leap style adapter you CAN probably run a k6-3+ 400 or a 233 mmx, or a cyrix mII at 233 (maybe even 266 with bf2 mod) or a tillamook at 266 (with chip mods) much of that will require help from Jan though. For bios support.

If you figure out how to set the fsb above 66mhz a k6-3+ 500 may even be possible.

I had to go back and re read this thread like three times to put this together

I don’t know why that board says single/dual but I think it threw everyone off and not having the model and a good pic from the start certainly added to the confusion, then there was talk about voltage settings?

https://www.ultimateretro.net/en/motherboards … ame=KM-T5-V3%2B

Idk, but that board clearly looks to have the vrm area of a socket 5 board which would explain EVERYTHING!

Edit, yeah, you got a socket 5 board man. Case closed. Lol (your socket very well may say 7 though) but it isn’t true 7

I do have an overdrive CPU but i dont have the fan that clips on. Its a socket 7 and im sure i can have this working just fine. I had it working well for quite some time, but once the HDD died i decided to take it apart Its a baby at , so its tiny and I cant fit a voodoo 2 into it, so i use the smaller voodoo 3 which would better serve me in my P2 or P3 but... ah well.

Sphere478 wrote on 2022-02-06, 07:00:

I had to go back and re read this thread like three times to put this together […]
Show full quote

I had to go back and re read this thread like three times to put this together

I don’t know why that board says single/dual but I think it threw everyone off and not having the model and a good pic from the start certainly added to the confusion, then there was talk about voltage settings?

https://www.ultimateretro.net/en/motherboards … ame=KM-T5-V3%2B

Idk, but that board clearly looks to have the vrm area of a socket 5 board which would explain EVERYTHING!

Edit, yeah, you got a socket 5 board man. Case closed. Lol

That link, which i found earlier shows its socket 7 and can take an MMX cpu

Law212 wrote on 2022-02-06, 07:07:

I do have an overdrive CPU but i dont have the fan that clips on. Its a socket 7 and im sure i can have this working just fine. I had it working well for quite some time, but once the HDD died i decided to take it apart Its a baby at , so its tiny and I cant fit a voodoo 2 into it, so i use the smaller voodoo 3 which would better serve me in my P2 or P3 but... ah well.

Which chip is it? Post clear pics of the processor. (Front and back)(There were many processors to carry the name overdrive)

Law212 wrote on 2022-02-06, 07:09:

Sphere478 wrote on 2022-02-06, 07:00:

I had to go back and re read this thread like three times to put this together […]
Show full quote

I had to go back and re read this thread like three times to put this together

I don’t know why that board says single/dual but I think it threw everyone off and not having the model and a good pic from the start certainly added to the confusion, then there was talk about voltage settings?

https://www.ultimateretro.net/en/motherboards … ame=KM-T5-V3%2B

Idk, but that board clearly looks to have the vrm area of a socket 5 board which would explain EVERYTHING!

Edit, yeah, you got a socket 5 board man. Case closed. Lol

That link, which i found earlier shows its socket 7 and can take an MMX cpu

Yea, the database is vast we are trying to make it acurate but there was a time beween socket 5 and 7 where stuff like this happened. We need to update the page for this board to indicate that mmx is only supported with powerleap or overdrive.

That database was created by members here, I myself have contributed to it.

Here is the CPU that I dont have a fan for. A bit of looking online looks like its not an overdrive. Someone told me it was , ages ago when i posted pictures of it when i found it in my moms basement

Anyway, I am certain that I have the jumpers properly set now to run the 200 MHZ MMX cpu. I also downloaded a new bios I will put this thing back together in the morning and see whats what.

I also took out the EDO Ram and put in some SDRAM

Law212 wrote on 2022-02-06, 07:54:

Anyway, I am certain that I have the jumpers properly set now to run the 200 MHZ MMX cpu. I also downloaded a new bios I will put this thing back together in the morning and see whats what.

I also took out the EDO Ram and put in some SDRAM

That board can not run a mmx cpu with only one power mosfet. It simply isn’t a dual plane board.

If you want to prove me wrong plug a short resistor leg into the pin in the center where the corner notch is and close the lever show a reading of 2.8v from that pin to the case of the computer if you can’t get that it’s not ready for mmx pentium, and you may damage the chip.

Does that pentium say sl259? The pic is blurry.

In any case, no it doesn’t appear to be a overdrive. The overdrives looked different on the bottom.

Sphere478 wrote on 2022-02-06, 08:04:

That board can not run a mmx cpu with only one power mosfet. It simply isn’t a dual plane board. […]
Show full quote

Law212 wrote on 2022-02-06, 07:54:

Anyway, I am certain that I have the jumpers properly set now to run the 200 MHZ MMX cpu. I also downloaded a new bios I will put this thing back together in the morning and see whats what.

I also took out the EDO Ram and put in some SDRAM

That board can not run a mmx cpu with only one power mosfet. It simply isn’t a dual plane board.

If you want to prove me wrong plug a short resistor leg into the pin in the center where the corner notch is and close the lever show a reading of 2.8v from that pin to the case of the computer if you can’t get that it’s not ready for mmx pentium, and you may damage the chip.

Does that pentium say sl259? The pic is blurry.

In any case, no it doesn’t appear to be a overdrive. The overdrives looked different on the bottom.

Are you saying it wont run at all? I was running this with an MMX CPU for I dunno, a couple years?

Law212 wrote on 2022-02-06, 08:09:

Sphere478 wrote on 2022-02-06, 08:04:

That board can not run a mmx cpu with only one power mosfet. It simply isn’t a dual plane board. […]
Show full quote

Law212 wrote on 2022-02-06, 07:54:

Anyway, I am certain that I have the jumpers properly set now to run the 200 MHZ MMX cpu. I also downloaded a new bios I will put this thing back together in the morning and see whats what.

I also took out the EDO Ram and put in some SDRAM

That board can not run a mmx cpu with only one power mosfet. It simply isn’t a dual plane board.

If you want to prove me wrong plug a short resistor leg into the pin in the center where the corner notch is and close the lever show a reading of 2.8v from that pin to the case of the computer if you can’t get that it’s not ready for mmx pentium, and you may damage the chip.

Does that pentium say sl259? The pic is blurry.

In any case, no it doesn’t appear to be a overdrive. The overdrives looked different on the bottom.

Are you saying it wont run at all? I was running this with an MMX CPU for I dunno, a couple years?

I’m saying it’s not correct. That cpu calls for 2.8v and you could be supplying it with 3.5v this is literally why the mmx overdrive exists to run in a 3.5v socket.

Can it work, maybe, is it right? No, is it supported no. If you are saying you don’t care that’s one thing, I’m saying it’s wrong. If you don’t care it belongs to you and you may do as you like. I’ve done my part in helping and will bid adeu. If you have more questions just ask. 😀

https://www.elhvb.com/mboards/kaimei/km-t5-v_ … kmt5v-rev3.html

This seems to indicate it can handle dual-plane

evasive wrote on 2022-02-06, 08:20:

https://www.elhvb.com/mboards/kaimei/km-t5-v_ … kmt5v-rev3.html

This seems to indicate it can handle dual-plane

The pictured board in that link appears to have a different vrm configration than OPs board

(As well, no sd slots)

It’s hard to see but I believe I see two fets on this one, one possibly without a heatsink installed? (Hard to see fet by simm slots) if that interpretation of this pixelated image is correct, this configuration shown in your link would support dual plane voltages. But OP’s only has one fet. So OP’s is single plane.

On a dual plane board, often the I/O fet is left without a heatsink because with the core fet now running the cpu the I/O fet has barely any load.

This could evolve into a conversation about pwm/buck/switching regulators/converters vs linear regulators. But suffice to say, these in the pic and OP’s appear to be linear due to lack of a inductor coil. (Linear is The hotter of the two types)

Edit: more I look the more I see two heatsinks and two fets.>

This device will allow your board to have dual plane. (You can see it uses a buck/switching/pwm regulator/converter the cooler kind)
https://www.ebay.com/itm/134015037378?

This is a mmx overdrive which works on single plane. You can see the extra stuff they installed under the heatsink to create the above device but on the cpu it’s self.
https://www.ebay.com/itm/233758283496?

yep, 2 transistors. At the time MOSFETs were not used yet.

evasive wrote on 2022-02-06, 09:55:

yep, 2 transistors. At the time MOSFETs were not used yet.

Agreed.

What would be a generic term to refer to both? Vrm?

Sphere478 wrote on 2022-02-06, 10:03:

evasive wrote on 2022-02-06, 09:55:

yep, 2 transistors. At the time MOSFETs were not used yet.

Agreed.

What would be a generic term to refer to both? Vrm?

Transistors would be the generic term
bipolar transistors,
metal oxide semiconductor field effect transistor,
darlington ... transistor
etc.