Re: Throttle Blaster

Posted on Today, 03:31

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If I remember correctly, for best throttle results without stuttering, CPU frequency must be divided by 8. So for Pentium 4 it's 1600Mhz or 3200Mhz CPU, because Pentium 4 multiplier can't go lower than 12x. sound stuttering is how I remember Throttling done with ISA DMA/SMM(afaik this is thru ACPI …

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Re: Broken socket 7 board - Epox P55-TF. Stuck in post

Posted on Today, 03:25

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Not really, nothing comes to mind :( post2 should output something, it does exactly two writes to diagnostic card so that tells us somehow on your board you need to bruteforce ISA bus to get anything? or that its something else going wrong and those bad post codes are how your POST Card reacts. Hmmm …

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Re: List of open-source PC hardware projects

Posted on Yesterday, 17:31

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Commodore-PC10-III PCB Reproduction https://github.com/Board-Folk/Commodore-PC10- … II-Reproduction

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Re: PC tower cases by year

Posted on Yesterday, 03:46

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I can only find sign of two "Comtrade" computers for sale, this was one of the two :] only findable by misspelling the name and counting on Google doing OCR on all images - if you image search "coNtrade pc commputer" google shows same picture linking to ebay vintage section :) Other one "COMTRADE …

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Re: SBEMU: Sound Blaster emulation on AC97

Posted on 2024-04-25, 12:11

by

by rasz_pl

in Marvin \ Sound

in Marvin \ Sound

wierd_w wrote on 2024-04-25, 10:40: At that kind of sample rate its audiophool scam

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Re: SBEMU: Sound Blaster emulation on AC97

Posted on 2024-04-25, 10:29

by

by rasz_pl

in Marvin \ Sound

in Marvin \ Sound

wierd_w wrote on 2024-04-25, 07:05: at rates at 960,000hz or higher. Even Bats top out at 100Khz 😀

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Re: SBEMU: Sound Blaster emulation on AC97

Posted on 2024-04-25, 06:45

by

by rasz_pl

in Marvin \ Sound

in Marvin \ Sound

megatog615 wrote on 2024-04-25, 03:56: Does SBEMU use MMX instructions if it can? Wondering if this could lead to a speedup on Pentium MMX systems. Why? is it too slow for you?

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Re: Broken socket 7 board - Epox P55-TF. Stuck in post

Posted on 2024-04-25, 03:01

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This is very weird, no matter what cpu tries to output you end up with same garbage on post card? :0 Deunans post1a should continuously output 55AA FFF0 mov al, 55h FFF2 out 80h, al ; manufacture's diagnostic checkpoint FFF4 jmp short $+2 FFF6 jmp short $+2 FFF8 mov al, 0AAh FFFA out 80h, al ; …

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Re: List of open-source PC hardware projects

Posted on 2024-04-25, 02:48

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

S3 Vision 968 VLB replica by Madao https://www.vogons.org/viewtopic.php?f=63&t=76602 https://github.com/matt1187/968VL I forgot about my own :0 Open Source AT&T Globalyst/NCR/FIC 486-GAC-2 proprietary Cache Module reproduction by rasz_pl https://www.vogons.org/viewtopic.php?f=46&t=94550 https:// …

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Re: S3 Vision 968 VLB replica

Posted on 2024-04-25, 02:44

by

by rasz_pl

in Marvin \ Video

in Marvin \ Video

Fantastic! You didnt include your modified symbols, but Kicad is able to recover them from cache somehow so its all good. Immediately reposting in List of open-source PC hardware projects

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

Posted on 2024-04-25, 02:26

by

by rasz_pl

in Release Announcements

in Release Announcements

About running wire under the PCH - Iphone 6 was very bendy, this resulted in breaking pads under Meson (touch). Those are pads very close to the edge and you arent going between the balls, yet repair is already a huge B. I dont see a home gamer succeeding with a wire going from 6 rows deep, and if …

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Re: Geforce4 Ti4200 - Black screen

Posted on 2024-04-24, 13:14

by

by rasz_pl

in Marvin \ Video

in Marvin \ Video

The 6BXC 2.0 revision is actually OK. implement JP18 and JP19 connectors which directly connect the 3.3V from power-supply to AGP device. Hah its right there on top of the board, JP 12 JP 13 Voodoo jumpers :) I also didnt look too hard at the board the first time, it actually has three LX8384 LDOs …

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Re: Geforce4 Ti4200 - Black screen

Posted on 2024-04-24, 06:14

by

by rasz_pl

in Marvin \ Video

in Marvin \ Video

https://theretroweb.com/motherboards/s/gigaby … ga-6bxc-rev-2-0 is even worse, as seen on teh picture there is LDO right next to AGP slot LX8384 3.4V at 5A = ~17W max power to AGP slot. You might need to solder a wire between ATX 3.3V and AGP 3.3V, lifting output leg of LX8384 is optional.

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Re: 50mb HDD, no scandisk errors but errors during operations

Posted on 2024-04-24, 01:36

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I just installed an old 50mb quantum drive as single master. model wouldnt hurt - pls note that my isa runs at 15MHz. I don’t know whether this is hdd dependent change to 8mhz and test if still happening - might a low level format out of the bios including re-adjustment the interleave help? is this …

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Re: Rippling effect on QP-VGA4

Posted on 2024-04-24, 01:28

by

by rasz_pl

in Marvin \ Video

in Marvin \ Video

I suspect LCD monitor, looks like those ripples on Voodoo3 with monitors that fail to properly sync.

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Re: Geforce4 Ti4200 - Black screen

Posted on 2024-04-24, 01:21

by

by rasz_pl

in Marvin \ Video

in Marvin \ Video

Asus is one of the brands "wisely" feeding 3.3V to AGP from its internal DCDC converter (L16 inductor), same one powering RAM 🙁 Its good for period correct graphic cards only, so up to ~2001. Higher end might need modding to bypass onboard 3.3V for ATX source.

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Re: Broken socket 7 board - Epox P55-TF. Stuck in post

Posted on 2024-04-23, 23:14

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looking at the disassembly of bios I dont see the way for it to start with CF code. Since you have a programmer can you try those Deunan bioses Re: Problem with DTK PEM-4036YB (PEM-0036Y), no post ? those will test if path between CPU and POST card is working correctly

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Re: Broken socket 7 board - Epox P55-TF. Stuck in post

Posted on 2024-04-23, 13:25

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I disassembled your bios and its normal award, post codes start from C0. hmm do you have another cpu? also if you have remove TAG ram and cache from cache slot. From C0 to CF is a lot of bits and instruction for something like broken tracks distorting data Did you scroll on a post card all the way …

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Re: Asus K7V Slot A hi-lo-hi-lo beeps

Posted on 2024-04-23, 13:14

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

"measure (DC voltage mode, 5V range)" make a list with pin number and measurement. Start with pins 67-70 and 79-94, 38 and 47 are also interesting. It does look like both -5V and -12V are used for reference voltage for thermistors? Weird.

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Re: Broken socket 7 board - Epox P55-TF. Stuck in post

Posted on 2024-04-23, 04:49

by

by rasz_pl

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Imperious wrote on 2024-04-23, 03:45: https://blog.theretroweb.com/2024/01/20/award … ost-codes-list/ According to those lists C and E are at the end of the POST, not the start. someone either corrupter that table or sorted it alphabetically 😀 C codes are at the very start

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