Re: cmos shutdown register read/write error

Posted on 2020-06-13, 03:18

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I would first spend some time checking the connectivity of the traces where the battery leak had occurred, especially through the vias and under the keyboard connector. Then I would verify that the opti 82c206 is getting 5v on its VCC pins.

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Re: PSU Voltage Concerns

Posted on 2020-06-13, 02:17

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah 4.4V on 5V rail is really low. You could unplug some of the heavy duty cards (e.g. the Voodoo, replace with a normal AGP card) and HDDs to see if it returns. Most probably due to leaky caps on the 5V output, as increased ESR will draw lots of current till the pwm controller IC couldn't …

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Re: My Socket-939 All-in-One DOS/Win98/XP Gaming PC

Posted on 2020-06-13, 02:04

by

by kalohimal

in Marvin \ System Specs

in Marvin \ System Specs

I guess your 775 board is either having i845 or older chipset, or chipset from 3rd party like VIA? As far as I remember Intel chipsets after i845 no longer have any Win9x drivers. And GF 7100 doesn't have official Win9x drivers as well, modded drivers perhaps?

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Re: AT PSU worth it for AT computer?

Posted on 2020-06-13, 01:42

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The adapter I have looks like a simple cable, I don't think it makes up for the -5V circuit. But wouldn't it be simple to make one that turns +5V ito -5V? It's easy to drop -12V to -5V with a simple 7905 voltage regulator circuit . It's inefficient and will need a heat sink but will get the job …

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Re: Help Identify 486 motherboard with SiS 496/497 chipset

Posted on 2020-06-13, 01:03

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This one? Chipset, ISA/PCI slots, cache, RAM banks, CPU and ROM locations all matches your pic.

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Re: My Socket-939 All-in-One DOS/Win98/XP Gaming PC

Posted on 2020-06-13, 00:34

by

by kalohimal

in Marvin \ System Specs

in Marvin \ System Specs

Sounds great. I had tried HIMEMX once before but couldn't get it working, maybe I should try again, thanks for the tips.

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Re: My Socket-939 All-in-One DOS/Win98/XP Gaming PC

Posted on 2020-06-12, 16:20

by

by kalohimal

in Marvin \ System Specs

in Marvin \ System Specs

Execellent choice, I love the YMF744 as it has excellent compatibility with DOS. Just one thing though, with the VIA 8237 chipset you'll most probably need Yamaha's dsdma TSR, and it will reset the system when RAM size is greater than 512MB (not sure if there's a bug). So with 2GB you'll need JEMMEX …

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Re: My Socket-939 All-in-One DOS/Win98/XP Gaming PC

Posted on 2020-06-12, 13:07

by

by kalohimal

in Marvin \ System Specs

in Marvin \ System Specs

Yes it does have drivers for Win98, it's one of the reasons why I bought it. And as you said it's very rare nowadays, occasionally you'll see it crops up on ebay, usually asking/selling for a ridiculous price. I was lucky to find it at a local used computer parts store for a reasonable amount of …

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

Posted on 2020-06-12, 00:34

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The Intel chipsets after 8xx series, break the compatibility of pci soundcards in DOS. Yes that's right, they no longer support PC/PCI and DDMA. But with Yamaha YMF744 and a set of modded drivers (specifically modded setupds.exe) + Yamaha's dsdma (a small protected mode TSR driver which reroutes …

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

Posted on 2020-06-11, 14:37

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

MKT_Gundam wrote on 2020-06-11, 14:32: So is the G41 chipset runs DOS with PCI soiudncard? Are you using freedos ? Yes it can, and I've tested many mobos with G41, but I've not tried FreeDOS. No reason that it won't work though. For the games I tried, mostly are on DOS7 (the one from Win98), …

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

Posted on 2020-06-11, 14:33

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

SuperSirLink wrote on 2020-06-11, 12:56: No worries! Thanks for taking the time to look into it! You're most welcome.

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Re: ES1868F sound card - blown components

Posted on 2020-06-11, 11:45

by

by kalohimal

in Marvin \ Sound

in Marvin \ Sound

X usually means crystals, but that sure doesn't look like an smd crystal to me, and more like a normal capacitor. If you can get hold of a capacitance meter you could measure the one on top and take a look. It's connected to pin 6 of the 386d which is V+ and a big plane which looks like ground, so …

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

Posted on 2020-06-11, 04:22

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

After some careful reading of this document, it seems that the multiplier bits in "Power-On Configuration Register" (bits 22-25) are read only. They are set according to the CPU pins during power up. This implies that they are set by the motherboard upon booting, perhaps using some external …

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

Posted on 2020-06-11, 03:59

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok I managed to find the PII Developer's Manual. On page 5-8 it was mentioned this is set using the "Power-On Configuration Register". This is a scheme entirely different from SpeedStep, and that's the reason why CPUSPD/Setmul can't change it. Let me take a look, might include it in the next …

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

Posted on 2020-06-11, 03:02

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Sorry, I meant that neither is able to set the multiplier... Is your PII-400 an engineering sample? Because as far as i can remember, Intel started locking their CPUs from PII Deschutes onwards, and max frequency of Klamath is 300MHz, so your 400MHz CPU should be Deschutes or later which is …

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

Posted on 2020-06-11, 02:01

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

One not so obvious features of CPUSPD is that it allows you to set the voltage of the CPU. By lowering the voltage when running at lower multiplier will reduce power consumption and heat generated by the CPU, allowing it to reduce fan speed and run quieter. The difficult part is that you must know …

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

Posted on 2020-06-11, 01:10

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Cheers! It's good to have options and you seem to have given newer cpus just that. Thank you for your time and efforts! Thanks clueless1, that is exactly the purpose of this program. Previously I used Throttle and Setmul quite a lot and both are excellent, but they couldn't do it for quite a few …

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

Posted on 2020-06-11, 00:53

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

SuperSirLink wrote on 2020-06-10, 21:11: Setmul does seem to change my CPU multi, and running your program with the a switch reports the same... Hi SuperSirLink, Does that mean CPUSPD couldn't change the multiplier but Setmul can? Or do you mean it works the same as Setmul? Hope it's not another …

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

Posted on 2020-06-10, 04:14

by

by kalohimal

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi henk717, No worries, it won't interfere with real mode programs, all real mode apps/games will be able to run as per normal in real mode (as you can see from the games I tested). Since CPUSPD is not a TSR, it will only switch the CPU to protected mode when it is doing it's job. Once it is done, …

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Re: My P3 Retro DOS PC

Posted on 2020-06-10, 02:33

by

by kalohimal

in Marvin \ System Specs

in Marvin \ System Specs

Yeah, understood. The P3 is not the best machine for DOS. P3 is very good for DOS except it doesn't offer multiplier and fine throttle control. But since it is not too fast, using cache and throttle is good enough. :) I had previously mentioned that my GF2, which would be more compatible than my …

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