Re: Interposer for mobile Pentium MMX Tillamook

Posted on 2023-10-24, 18:51

by

by RayeR

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ah, I also have some low-temp solder paste (indium based?) but I don't belive it would be stable as old good Sn37Pb63... And I even didn't think about it as I don't use it for normal soldering...

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Re: Interposer for mobile Pentium MMX Tillamook

Posted on 2023-10-24, 16:54

by

by RayeR

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

On the top side I left unmasked copper area witch cca 200 tiny vias for thermal conduction. I apply solder paste, put IHS on and solder by hot air...

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Re: Interposer for mobile Pentium MMX Tillamook

Posted on 2023-10-24, 14:52

by

by RayeR

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

A looked in DS again, IOs are not 3,3V tolerant except CLK input where it is explicitly mentioned. For other inputs the maximum is VIO+0,3V so if someone use separate VIO regulator at 2,6V then maximum on input would be +0.3 = 3.0V, still over limit of 3.3V. Reasonable compromise would be set VIO at …

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Re: Interposer for mobile Pentium MMX Tillamook

Posted on 2023-10-24, 12:42

by

by RayeR

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Exceeding the absolute max. rating is not good idea generally, esp. for long run. But for some retroplaying it probaby would not degrade too fast. A tiny SMPS would be possible, modern components like used in smartphones can easily fit on top side under heatsing not exceesing 0.8-1mm height. Also …

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Re: Interposer for mobile Pentium MMX Tillamook

Posted on 2023-10-24, 06:11

by

by RayeR

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I also have socket 5/7 desoldered from some dead MB but the plastic could melt during pins soldering so I'd rather use that precise socket. BTW there's a bit problem with voltage of this mobile MMX CPU. DS says abs. max, Core/VIO : 2,8/3,2V and operating values Core/VIO : 1,8/2,5V. Some newer …

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Re: Interposer for mobile Pentium MMX Tillamook

Posted on 2023-10-24, 03:51

by

by RayeR

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Epoxy glue applied, no step back... I did some thermal design calc. One via should have Rth = 222K/W, then 200 vias in parallel gets 1,1K/W total. CPU TDP @266MHz is 7,6W so temp. gradient from CPU core side to heatsink side should be 8K, not bad... I have 4 lame Celeron 400 PPGA and some lame …

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Re: dISAppointment - LPC to ISA adapter - ISA on modern motherboards

Posted on 2023-10-24, 02:23

by

by RayeR

in Release Announcements

in Release Announcements

Yes, I already have bought Fintek F85226FG from Aliexpress years ago, waiting to be soldered. I checked my schematics and I have a pull-up 8k2 on master signal. I drawn it by reference sch. from the DS.

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Re: Interposer for mobile Pentium MMX Tillamook

Posted on 2023-10-24, 01:50

by

by RayeR

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes, Dgk has something usable (1mm body dia.) but insane prices, for such pin count I could buy whole cpu instead. Need some cheap aliexpress for $1 a 100pcs lot and free shipping 😜

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Re: Interposer for mobile Pentium MMX Tillamook

Posted on 2023-10-24, 00:10

by

by RayeR

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I just finished the major part of soldering job. It took about 4 hours of soldering and inspection under binocular magnifier. Maybe comparable to some neurochirurgical operation :p I had some short on vcc3 but after some cleaning it's gone. I hope no more shorts. Now I need to do next important step …

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Re: Matrox G450 (with DVI outout) working on a HOT433 main board (UMC 8881)

Posted on 2023-10-17, 19:22

by

by RayeR

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I currently not release it as OS, just freeware. Except I released LPT bitbang driver for OS project FlashROM e.g...

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Re: Matrox G450 (with DVI outout) working on a HOT433 main board (UMC 8881)

Posted on 2023-10-13, 04:58

by

by RayeR

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You can use my SMB tool to play with PCI, also scripting is possible... http://rayer.g6.cz/programm/programe.htm#SMB

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Re: dISAppointment - LPC to ISA adapter - ISA on modern motherboards

Posted on 2023-09-27, 22:48

by

by RayeR

in Release Announcements

in Release Announcements

I finished my design of LPC2ISA started years ago. I added switched inverter 5V -> -12V and LDO for -5V so it could be powered by a single Molex (3V3 is taken from LPC header). So I'll prepare a batch with some other PCBs for JLC...

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Re: Matrox G450 PCI any good use?

Posted on 2023-09-10, 20:22

by

by RayeR

in Marvin \ Video

in Marvin \ Video

If it would be just a die shrink without changing any internal registers and logic then there's no reason why G450 not work (after changing DID) with old drivers. But as there 2nd RAMDAC was added it would be reason that some internal logic was changed and that could break the compatability with …

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Re: NVIDIA Kepler/Maxwell/Pascal VESA Bios Bug (workaround found)

Posted on 2023-09-05, 11:54

by

by RayeR

in Marvin \ Video

in Marvin \ Video

Thanks for info, it's really noticable speed up. I will test on my GTX970, I expect it's affected the same as 980.

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Re: NVIDIA Kepler/Maxwell/Pascal VESA Bios Bug (workaround found)

Posted on 2023-09-04, 20:17

by

by RayeR

in Marvin \ Video

in Marvin \ Video

Falcosoft wrote on 2023-09-04, 20:07: According to my tests when WC flag is working for VGA FB it can speed up rendering by 2-15%. That's not much worth (I guess that bottleneck is calling vbios and PM/RM switching)... on LFB the speed up may be 50x on modern systems with PCI-E...

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Re: NVIDIA Kepler/Maxwell/Pascal VESA Bios Bug (workaround found)

Posted on 2023-09-04, 19:55

by

by RayeR

in Marvin \ Video

in Marvin \ Video

Yes but window switching bios calls would probably make it much slower regardless setting WC...

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Re: NVIDIA Kepler/Maxwell/Pascal VESA Bios Bug (workaround found)

Posted on 2023-09-04, 16:41

by

by RayeR

in Marvin \ Video

in Marvin \ Video

[/quote] For vga it doing some strange things , not working at all [/quote] Maybe, I never used it for VGA as the VGA FB is only 64kB and it doesn't have much sense to use it in such modes like 320x200 as they are fast enough anyway...

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Re: NVIDIA Kepler/Maxwell/Pascal VESA Bios Bug (workaround found)

Posted on 2023-09-02, 11:52

by

by RayeR

in Marvin \ Video

in Marvin \ Video

an64 wrote on 2023-09-02, 08:27: Is anybody know dos utility to set mtrr's on intel ivy bridge cpu? My mtrrlfbe should work.

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Re: NVIDIA Kepler/Maxwell/Pascal VESA Bios Bug (workaround found)

Posted on 2023-08-30, 11:45

by

by RayeR

in Marvin \ Video

in Marvin \ Video

Good idea, unfortunatelly I don't have any from this range, only 230, 270, 670, 970. Couldn't you extract from full image file for card vbios update? BTW a friend of mine found and compiled nvidia XSOD DOS utility that can enable/switch different VGA outputs e.g. CRT/DVI/LCD display, mostly useful …

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Re: Matrox G450 PCI any good use?

Posted on 2023-08-29, 05:55

by

by RayeR

in Marvin \ Video

in Marvin \ Video

I also got this VGA from a friend few days ago who saved it from a trash, already with removed bracket and heatsink. I fixed bent pins and did a quick test - it seems to be alive, VMT passed. I also updated VBIOS to the latest version 2.1 but it didn't add any new VESA modes. My LCD has native …

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