Re: Homemade speakers are buzzing

Posted on 2020-09-30, 22:15

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

The Creative card shouldn't have a problem with TRS connector being inserted into its output connector(s). In worst case you can use a low value resistor (say 10 ohms) between the ring and sleeve if things end up not working on the Creative card.

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Re: Capacitor reading

Posted on 2020-09-30, 14:49

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

it is a 180µF 16V part, the value is not critical in this sort of application. You can use 100µF or 220µF and it'll still work.

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Re: I'm happy i just got a fic 486-pvt-io with 486 dx4-75mhz, but i cant update bios

Posted on 2020-09-29, 15:02

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm pretty sure the board uses an OTP EPROM so you cannot update the BIOS from software, since the chip can only be written once and that's already been done. Chances are you can pop in a 29F010 type NOR flash but chances are you need to burn the new BIOS on it with a dedicated programmer device or …

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Re: Homemade speakers are buzzing

Posted on 2020-09-29, 10:46

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

A socket only meant to accept TRS connector can have its Sleeve contact be in multiple locations (depending on particular manufacturer) and the whole premise is that it happens to connect where the 2nd Ring is, it is the only thing I can think of being able to cause such a problem. You'll definitely …

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Re: PCI Latency Timer info

Posted on 2020-09-28, 14:46

by

by Tiido

in Marvin \ Video

in Marvin \ Video

It means how long can a PCI device hog the bus before another thing gets its turn. If some other device begins to suffer (such as getting stuttering in sound) you want to reduce the value. Otherwise keep it high as it allows more data to be passed in single bus transaction.

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Re: An idea about making MIDI daughterboards from existing sound cards

Posted on 2020-09-28, 13:17

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

You can divide down master clock of the chip to be the system clock for any modern DAC supporting the 16bit right justified format (most do). Some DACs can work with 33MHz rather than 16MHz (or lower) clock, such as PCM1781.

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Re: Homemade speakers are buzzing

Posted on 2020-09-27, 10:58

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

This makes me think that the ground is not getting connected, on the TRRS connector you want last ring and sleeve to be connected together as GND, since various connectors do the sleeve/ground connector at different points and maybe on the other computer the ground connection happened where the …

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Re: Looking for DFI K6XV3+/66 hires pictures

Posted on 2020-09-26, 11:15

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This is excellent, it looks like pin 52 is the extra address line and not pin 40.

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Re: An idea about making MIDI daughterboards from existing sound cards

Posted on 2020-09-26, 10:02

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

You could locate the MIDI TX line, sever it and input whatever else from another card in there. Sound output is gonna be harder with some cards as the digital data often goes not into a dedicated DAC but into the main sound chip where the DAC will reside, requiring the host card to be initialized …

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Re: Dream SAM9733 and SAM9407 based MIDI devices distortion fix

Posted on 2020-09-25, 08:31

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

I'm just sending a Dream specific NRPNs to the chip that controls the Master Volume of SAM9733, it shouldn't get in the way of anything else. By default the volume is very high and there's good amount of digital clipping going on prior to data entering the DAC on the card with many tracks, you can …

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Re: Dream SAM9733 and SAM9407 based MIDI devices distortion fix

Posted on 2020-09-24, 17:35

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

It turns out CleanWave32 problem stems from another fault : CleanWave32 distortion fix This util is till useful for reducing digital clipping problems as the default master volume is very high on these devices.

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CleanWave32 distortion fix

Posted on 2020-09-24, 16:47

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

CleanWave32 is Dream's sample set found on some waveblaster modules like MIDITEMP DS48, but it seems to have a bug that causes digital overflow effect resulting in awful cracking noises when sound gets loud enough. Here's the distortion : FLAC : http://www.tmeeco.eu/BitShit/PCschit/ElkmoonBad.flac …

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Re: Sound Bank rom dumps - how are made?

Posted on 2020-09-23, 19:50

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Yeah, that's how things are done. You desolder the chip, pop it in a programming adaptor and use your favorite programmer to read the chip, assuming proper chip type is chosen as the pinouts of ROMs are not always same as normal EPROMs and flash chips one normally uses a programmer device for.

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Re: S3 Vision 968 VLB replica

Posted on 2020-09-21, 18:57

by

by Tiido

in Marvin \ Video

in Marvin \ Video

Very awesome stuff, good luck ~

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Re: Realibity of old WDC HDD

Posted on 2020-09-20, 08:09

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Several of my old (under 2GB) WD drives have stopped working also, and I imagine the few remaining will do, all the Conner drives I have no longer work also. Quantums and Seagates I have all function and don't seem to have any bad sectors developed on them.

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Re: Identifying components on Gravis Ultrasound MAX Rev. 1.8 and Roland SCB-7

Posted on 2020-09-15, 21:02

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Congratulations ~

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Re: Orpheus Soundcard: a new DOS soundcard with SPDIF/OPL3/MPU support

Posted on 2020-09-15, 03:24

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Hundreds of them are easily available if not thousands, it shouldn't be a problem to source these parts at all to fill any possible demand.

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Re: 3-chip vs 9-chip 30-pin SIMMs

Posted on 2020-09-13, 20:50

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

3 or 9 pins shouldn't matter, other than for possible overclocking as 9 pin SIMMs put higher load on the bus which will tax the system harder. Both types will have parity and only other difference is that 3 chip ones have 8 data bits coming out of two chips rather than 8 where each handles only …

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Re: Nexgen motherboard and Intel 486

Posted on 2020-09-13, 17:50

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah, the socket is completely different, no other CPU will fit in it.

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Re: Setup for recording (DOS) audio

Posted on 2020-09-12, 23:30

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

I have been using a card named ESI Juli@ for all my stuff, it is an actual production orientated card that has no resampling and other stuff getting in the way. I have been most happy with the results it can provide, just be sure not to miss the breakout cable as that's where all the digital I/O and …

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