Re: 486 board needs to be manually reseted each time.

Posted on 2020-07-18, 10:30

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Seems to me like there are still problems with the traces around the corroded area. 0503 actually means current code 05, previous code 03. Same for 1413, current code is 14, meaning it is stuck at test 14. You can check the AMI POST codes here . Look for the table for AMI BIOS 1993. Perhaps a …

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Re: CpuSpd - A Hardware Based CPU Speed Control Utility for DOS/Win98 Retro Gaming

Posted on 2020-07-18, 07:10

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok that's great! Please allow me some time to cook up the codes.

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Re: CpuSpd - A Hardware Based CPU Speed Control Utility for DOS/Win98 Retro Gaming

Posted on 2020-07-18, 03:11

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@JazeFox After some digging I managed to find the datasheet for C7-M (Esther model A & D). However I could not find any information regarding MSR 110Ah, which is the VIA powersaver control register. From various info scattered on the internet, it seems that C7 multiplier could be set using standard …

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Re: CpuSpd - A Hardware Based CPU Speed Control Utility for DOS/Win98 Retro Gaming

Posted on 2020-07-18, 00:53

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi JazeFox, Thanks for the feedback. Currently the program supports VIA C3 only, C7 and Esther are not supported at the moment. It should report "Multiplier control is not supported" instead of the weird -0.1 multiplier, I'll take a look at this bug.

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Re: CpuSpd - A Hardware Based CPU Speed Control Utility for DOS/Win98 Retro Gaming

Posted on 2020-07-17, 18:50

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I do not know exactly how Intel or the south bridge manufacturers implement hardware ODCM and throttling in their CPUs and chips, but here are what I suspect is happening. I do agree with you that on the ODCM duty cycles, the spacing of odd number ODCM will have uneven spacing. For the multiplier, I …

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Re: CpuSpd - A Hardware Based CPU Speed Control Utility for DOS/Win98 Retro Gaming

Posted on 2020-07-17, 14:28

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just tried running Landmark 2.0 with cache off, odcm 1, throttle 1, multiplier 6. It reported the system as an AT with a clock speed of... 0.5MHz! Lol Filename IMG_20200717_222124.jpg File size 1.09 MiB Views 2227 views Filename IMG_20200718_001606.jpg File size 1.28 MiB Views 2221 views

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Re: CpuSpd - A Hardware Based CPU Speed Control Utility for DOS/Win98 Retro Gaming

Posted on 2020-07-17, 13:20

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@PARUS This is great stuff. With a Dual Core E6700/3.2G, and a Biostar P4M900-M7 FE with VIA 8237 south bridge, we can now get the following: Cache on/off : 2 steps ODCM 1-8 : 8 steps SB throttling 1-16 : 16 steps Multiplier 6.0-12.0 with 0.5 increment : 13 steps L2 cache on/off : the effect is …

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Re: can you make my 386SX motherboard to work?need some help

Posted on 2020-07-17, 09:34

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Oops me bad, was thinking 486. Yeah 2 pcs SIMM would work for this board.

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Re: can you make my 386SX motherboard to work?need some help

Posted on 2020-07-17, 08:14

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You need 4 pieces of SIMM-30 to work, 2 pcs won't work and neither would 1. For speaker, your POST card has one onboard, all you need is a wire to connect it up (which should come with your POST card). Btw, it horrifies me to see direct soldering onto the AT connector.

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Re: Shuttle HOT-327, keyboard still not working after patching most traces.

Posted on 2020-07-17, 08:06

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Agree with Miphee that the patch work is quite messy. If you could find wire wrap wires, it would be much neater as they are quite thin. Keep the wire length as short as you could, and clean up the flux with alcohol and it would be better. I saw corrosion at the top side of the board near the …

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Re: Juko ST super turbo XT motherboard

Posted on 2020-07-16, 17:44

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I still have the 8-bit VGA and multi I/O cards, unfortunately its keyboard was long gone so for now it will remain in storage.

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Re: Juko ST super turbo XT motherboard

Posted on 2020-07-16, 16:47

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It's a C8087-3 which is 5MHz. You're right about the FPU running at the same clock speed as the CPU (both of their clock pins are connected), so yeah it won't work in turbo. It was so long ago I could hardly remember what happened. It was probably inserted many years after the board was put into …

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Re: Unique (Juko ST) UX Turbo XT Mainboard - utility diskette

Posted on 2020-07-16, 14:26

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

GrooBR wrote on 2019-08-10, 23:29: Hi Can you scan this motherboard's manual ? It apperars to be the same of mine. Thank you, […] Show full quote Hi Can you scan this motherboard's manual ? It apperars to be the same of mine. Thank you, It's available here.

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Re: Juko ST super turbo XT motherboard

Posted on 2020-07-16, 14:15

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have the exact same board, which I bought new in 1990. It is a Unique UX Turbo. The manual is the same as the one linked above. jesolo also has another thread where the utility disk is available. Filename IMG_20200716_221125.jpg File size 1.85 MiB Views 1809 views

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Re: What's the dumbest retro mistake you've made?

Posted on 2020-07-16, 03:25

by

by kalohimal

in Milliways

in Milliways

Threw away half of my retro PC collections when moving house.

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Re: MSI MS-5169 dead - blown MOSFET?

Posted on 2020-07-15, 08:46

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Don't think the mosfet had become so hot the solder melted. The melting point of 60/40 solder is around 370 deg F and the lead free ones even higher at around 420 deg F. It looks more like a sloppy solder job. The mosfet shouldn't be cracked. If you have a multimeter, you could measure the input and …

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Re: DOS alternative to lspci?

Posted on 2020-07-15, 03:51

by

by kalohimal

in Marvin \ Software

in Marvin \ Software

Isn't lspci open source? https://github.com/pciutils/pciutils/blob/master/lspci.c

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Re: Is my Voodoo5 5500 broken?

Posted on 2020-07-15, 00:00

by

by kalohimal

in Marvin \ Video

in Marvin \ Video

Yeah some of them do leak. Here are some that had blown their tops and failed open. They are from an HD4850 GPU that I repaired. Some constructions are not entirely solid but are hybrid, they use a mix of solid and liquid electrolyte. Filename IMG_20190629_222819.jpg File size 226.2 KiB Views 1490 …

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Re: Is my Voodoo5 5500 broken?

Posted on 2020-07-14, 18:01

by

by kalohimal

in Marvin \ Video

in Marvin \ Video

The 2 purple caps (100uF & 470uF) look like they had leaked all over U13 (SC1175) which is the switching controller.

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Re: Help with XT board

Posted on 2020-07-14, 17:19

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Try all the ISA slots and clean the VGA card's edge with an eraser too. The ISA slots on this board looks rather rusty, some of the connecting pins look corroded with green/white color stuffs.

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