Re: Modern 2.0 speakers and magnetic shielding (to protect CRTs) - is it even possible?

Posted on 2022-05-16, 16:16

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You can only use magnetic material to do magnetic shielding. The shield diverts the field away from what you need to protect and ideally you need an enclosed shape but that is difficult to achieve without some serious metalwork.... I use a flattened piece of PSU cover at my desk and it provides …

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Re: ATi Mach64 WinBoost - Memory expansion chips

Posted on 2022-05-16, 15:57

by

by Tiido

in Marvin \ Video

in Marvin \ Video

CBR refresh uses the internal refresh counter of the DRAM chip and there are many more rows in the larger chip (and controller doesn't specify which row, it only tells "refresh" and memory chip does rest on its own). All of them must still be refreshed in 16ms (or 32 or 64, depending on partcular …

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Re: Yamaha YMF-719 issues

Posted on 2022-05-16, 04:55

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Mixer sliders not working is the suspicious thing that maybe suggest something is wrong with the card, they should be fully functional and affect all the sound tests. Ok, it is only initialisation driver. I used google translate for the french documentation. You'll have to conf the IDE with correct …

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Re: Yamaha YMF-719 issues

Posted on 2022-05-15, 20:26

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

This sounds like there is actually something wrong with the card. All photos I see of the particular version of the card you got have single 33.8688MHz crystal, with missing 24.576MHz one. This could be the reason for the weirdnesses... You're not supposed to have another CD driver when using …

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Re: Yamaha YMF-719 issues

Posted on 2022-05-15, 08:57

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Ok, that is strange. And at the same time, SETUPSA work fine ? What chip is on the card ?

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Re: Yamaha YMF-719 issues

Posted on 2022-05-14, 23:13

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

There's a special driver on the original driver CD that will initialize the card's IDE interface in CONFIG.SYS so that you can have IDE available for the CD driver that is loaded later in CONFIG.SYS. You can get it here : http://www.tmeeco.eu/9X4EVER/GOODIES/Yamaha/OPL3-SA/CD/DOS/ First one changes …

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Re: Yamaha YMF-719 issues

Posted on 2022-05-14, 20:28

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

SETYMF has no YMF71x native IDE support, and IDE will be left whatever way a PnP BIOS set it to. IDE conf of my own YMF71x card uses a custom IDE interface and it only shows the options when my own YMF card is detected. (my card has custom IDE so it can be booted from on any computer not just ones …

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Re: Yamaha YMF-719 issues

Posted on 2022-05-14, 18:40

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Yeah, they need to be at 2-3 for line output, for connection to powered speakers or some other device. 1-2 is for passive speakers as was normal many years ago. This will fix the way too loud aspect and also dramatically reduce hissing too.

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Re: Yamaha YMF-719 issues

Posted on 2022-05-14, 17:44

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

http://www.tmeeco.eu/BitShit/YamahaCards/SM71 … .00%20front.JPG So your card doesn't have TEA2025 chip and the jumpers just right of it (JP1+2) ?

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Re: Yamaha YMF-719 issues

Posted on 2022-05-13, 19:43

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Have you jumpered the card to bypass the speaker amplifier ?

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Re: ATi Mach64 WinBoost - Memory expansion chips

Posted on 2022-05-12, 17:22

by

by Tiido

in Marvin \ Video

in Marvin \ Video

You seek places like utsource or contact some actual parts broker. Ebay prices are always very inflated. Oh, if card is 60ns and you put 70ns parts it will work but there can be occasional snow on the image and especially when temperatures rise.

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Re: ATi Mach64 WinBoost - Memory expansion chips

Posted on 2022-05-12, 16:52

by

by Tiido

in Marvin \ Video

in Marvin \ Video

There should be endless supply of suitable DRAMs in china, these chips were made in huge quantity. There are many many part numbers too, that is the main complication in finding anything, one particular chip may be unavailable but another plentiful. Mixing EDO and FPM likely won't work, you need …

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Re: ATi Mach64 WinBoost - Memory expansion chips

Posted on 2022-05-12, 15:58

by

by Tiido

in Marvin \ Video

in Marvin \ Video

The larger RAMs will not work, CBR refresh is used by the video chipsets and they only do enough refreshes to handle the 128KB chips. With 512KB chips there are lot more rows and they will not get refreshed frequently enough, resulting in image full of noise due to data corruption. You need 128KB …

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Re: VLB Edge Connector Replacements

Posted on 2022-05-10, 18:17

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have used PCI connectors, you pull out 8 pins and sandpaper the edge toward ISA slot and things fit and works fine.

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Re: MK8330 : new soundcard based on the CMI 8330 chipset

Posted on 2022-05-09, 17:34

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Yeah, that signal is not supposed to change but there are motherboards where the signal is off or altogether missing (chaintech 6VIA5T for example).

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Re: CRT Gurus! Please help!

Posted on 2022-05-08, 20:40

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Clipboard01.png This is the most common way things are done in the line deflection side, anything on the blue line is suspect. You'll have to measure parts to see if they are in spec and replace anything that is off. You cannot do stuff live unless you absolutely know what you are doing, life …

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Re: Hot swap clock jumpers?

Posted on 2022-05-08, 19:33

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

multiplier jumpers only act upon hard reset/power up, but the FSB jumpers should be immediate, but if the machine tolerates on the fly change must be experimentally tested. Most PLLs should do glitchless clock chance so there's a good change it will work.

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Re: CRT Gurus! Please help!

Posted on 2022-05-08, 19:28

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That sounds like EW correction is not working. It is likely the EW correction amp transistor is dead or there is a break in the path.

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Re: Dream SAM9733 and SAM9407 based MIDI devices distortion fix

Posted on 2022-05-08, 08:09

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

That is a significant improvement for the middle part that was really suffering ~

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Re: Doom 2 & Wolfenstein 3d VS OPL3-SAx sound card

Posted on 2022-05-06, 18:04

by

by Tiido

in Marvin \ Software

in Marvin \ Software

This makes me think the laptop has OPL3-SA in it, aka YMF701, which is not PnP and is not compatible with YMF711/5/8/9 that SETYMF can deal with, which is why it wasn't working. SETUPSA supports YMF701 and will update BLASTER variable in AUTOEXEC.BAT too. Any BIOS settings should be overridden and …

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