Re: SBPro1 CT1330A, lets solve the Reversed Stereo myth!

Posted on 2021-03-06, 18:00

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There's defnitely an offset between the L and R channels. There is a single 8bit DAC in the mixer chip which output is switched to L and R at half sample rate clock in stereo mode, so one channel precedes other by half stereo sample/full mono sample. I even remember seeing the switching noise on …

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Re: Clock Generator Overclocking

Posted on 2021-03-05, 17:12

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

When you change the 14MHz crystal you will cause some essential things such as system timer to speed up, which will break a lot of software. The very least you must make sure that all the 14MHz outputs remain what they are. Other things wouldn't be a problem as long as the PLL itself will be able to …

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Re: Who could repair a Yamaha DB50XG daughterboard ?

Posted on 2021-03-03, 15:51

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

I have now made the card work again, but unfortunately it didn't have an easy problem. It turns out the actual sound chip and one of the sample ROMs were damaged, possibly from 12V stub from a capacitor on a neighboring card getting in contact with an unfortunate location. It is one reason I very …

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Re: Candian soundcard oddity : Videoquip Dave-2000 (circa 1994?)

Posted on 2021-03-03, 14:10

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

That Soundport there is not a WSS codec but just a codec, basically only DAC + ADC + mixer features.

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Re: WaveBlaster daughterboard dimensions - what was the largest?

Posted on 2021-03-03, 12:59

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Full size card is the DB50/60XG, SCB55 and likenesses. These are the measurements I have been using and which seem to match some of the others : Re: FMonster, the monster of sound synth

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Re: Candian soundcard oddity : Videoquip Dave-2000 (circa 1994?)

Posted on 2021-03-03, 12:52

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

This doesn't look like it'll have any sort of DOS games compatibility. I'm pretty sure it is some speech synthesis card for a dedicated software environment.

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Re: Soundblaster AWE32 CT3670 One Channel problem

Posted on 2021-03-01, 17:03

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Whoops, yes, C146, right above the left side of speaker amp.

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Re: Soundblaster AWE32 CT3670 One Channel problem

Posted on 2021-03-01, 07:39

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

C416 passes right channel to the speaker amp, it looks pretty crusty and probably is the culprit. You can also check L5 for continuity as it also is in line with right channel to speaker output. The capacitor has 0.33µF capacitance, voltage rating should be anything higher than 12V. I'm not sure …

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Re: Soundblaster AWE32 CT3670 One Channel problem

Posted on 2021-02-28, 14:52

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It looks like several capacitors have leaked on the card so a recap is in order, and that should fix all the problems the card is exhibiting.

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Re: CHiLL XL enclosure

Posted on 2021-02-27, 17:40

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

A leg would be a nice idea. I'm not aware of anything bigger, this is supposed to be the max size.

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Re: Fried MB

Posted on 2021-02-27, 16:37

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I missed that inductor completely, yeah, there's definitely a short down the line somewhere...

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Re: Fried MB

Posted on 2021-02-27, 16:22

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Sometimes transistors and other silcon shorts and dies like so. It looks like the switching transistor of some voltage regulator gave up. Assuming no other problems, replacing the transistor and the close by capacitor will make things work again.

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Re: Video Card prices

Posted on 2021-02-27, 14:45

by

by Tiido

in Marvin \ Video

in Marvin \ Video

Yeah, one of Bitcoin's big things was that it has finite amount of them, there will be a point when all of them get mined. In theory lowest value for them is the cost of energy used to mine them.

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Re: Looking for a reference design schematic for a rare chip

Posted on 2021-02-26, 04:06

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The short answer is that this info will never come / doesn't exist. Longer answer is that when you know how the 286 and 386 buses work, the datasheet of that chip provides enough info to build the thing you're after. Most of it made sense when I went though the datasheet and there shouldn't be too …

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Re: Cursed 16-bit ISA super-IO controller cards, or just me?

Posted on 2021-02-26, 03:47

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That board needs a lot of work before it can work properly with any card. All the corroded parts need to be removed, cleaned or replaced altogether. There's probably bad vias and other things too that must be repaired. Some photos of both sides of the board near the battery will be helpful in …

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Re: Original Hardware: PCI clock measuring device.

Posted on 2021-02-25, 11:20

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

These look nice ~

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Re: Custom made, 50ns, FPM, Simm 30, memory modules with parity.

Posted on 2021-02-25, 03:45

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

While the addressing scheme looks like there is the exact same amount of CAS pages, the internal organization is different. It is very common for 1M x 1 chips to be internally organized the same as a 256K x 4 chip, where two address bits (often the highest row and column bit) are used to select …

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Re: Who could repair a Yamaha DB50XG daughterboard ?

Posted on 2021-02-24, 15:34

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

I have repaired one DB50XG which was silent. It turned out to be a defective DAC chip on that particular card.

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Re: Custom made, 50ns, FPM, Simm 30, memory modules with parity.

Posted on 2021-02-24, 02:34

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

How are there problems ? There's exact same amount of CAS pages and thus refresh cycles between the two organizations. If anything, 8/9 chip sticks propose challenges due to increased loading on the bus due to way more capacitance per signal which will bring rise and fall times down...

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Re: Video Card prices

Posted on 2021-02-20, 05:09

by

by Tiido

in Marvin \ Video

in Marvin \ Video

nvidia announced special crypto mining chip, perhaps it will get the miners off GPUs and things can stabilize, but who knows when it hits the markets and what impact it'll have...

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