Re: Seeking advice for P-166 i430VX SOCKET-7 system

Posted on 2019-08-04, 13:49

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

ESCD is often written into the BIOS chip. Have you tried to lower the FSB to see if it would make a difference ? Jump from 66 to 60MHz or perhaps 55 can show some improvement and perhaps disabling of cache also. If those have no effect the problem is not related to some timing violation but instead …

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Re: T-04YBSC-A, new YMF71x based sound card + SETYMF utility

Posted on 2019-08-04, 10:19

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

My software does set things so that the SB level change range is maximal. There's no SBpro2 style filter by default, all the filtering is made so that there's no meaningful attenuation in audible freq range on any sound source. You either have to change couple capacitors if want only the SB DAC …

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Re: SB Pro or SB 16 PCM audio in a microcontroller?

Posted on 2019-08-01, 14:30

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

SB16 adds some actual FIFO based mechanism between DAC and ADC, but I'm not sure if the MCU still has to manually pass data or there's some hardware doing that job.

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Re: What retro activity did you get up to today?

Posted on 2019-08-01, 12:23

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I swapped the 386SX25 for 386SX40 on one of my boards, now to find an oscillator to make use of the new speed capability 🤣

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Re: SB Live CD-DA/Redbook in DOS

Posted on 2019-08-01, 10:07

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

You need a WDM driver to have direct CDDA playback without a cable to sound card.

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Re: T-04YBSC-A, new YMF71x based sound card + SETYMF utility

Posted on 2019-08-01, 00:39

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Thänk you for the report, I will investigate. I even have the same motherboard to test things with.

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Re: GUS emulation with AWE cards

Posted on 2019-07-31, 17:38

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Looks like I'm too late on some aspects haha. I look forward to seeing this ~

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Re: Can I use DreamBlaster X2 for MT-32 emulation

Posted on 2019-07-29, 09:54

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

The custom sounds are new instruments (ADSR, filter and modulation settings) not new actual sounds (new attack samples and whatever else) that don't exist in the 512 or 1MB ROM bank. It is like on FM, you have one fixed sample (sine) that all the sounds have to use, but you can still create huge …

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Re: Can I use DreamBlaster X2 for MT-32 emulation

Posted on 2019-07-29, 09:38

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

I'm not sure about the sample upload capability, there's no sample RAM in any LA32 device and the sound chip cannot play sounds out of CPU interface nor can the CPU treat the LA32 device as a DAC of sorts. You can send in new instruments/patches that can set their own ADSR and whatever else the …

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Re: crt resolution issues

Posted on 2019-07-29, 07:23

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Another question about changing the shape and position of image box. crt starts by firing electrons for r then g then b, and repeats. rgb, rgb, rgb... When I move or shape the box, what if the electron that was supposed to hit red phosphor starts by hitting blue phosphor and the whole image is all …

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Re: GUS emulation with AWE cards

Posted on 2019-07-29, 07:03

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

I think the main problem is needing to use all new note step values to produce the correct music freqs when sample rate changes.

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Re: crt resolution issues

Posted on 2019-07-28, 10:54

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Nothing physically changes, the scan rates change and the beam draws stuff longer or shorter and since pixels of a CRT can show content of multiple pixels rather (i.e you can have a red pixel spot be half lit) than just one as it is in digital panels you get "subpixel scaling" which lets lower or …

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Re: Exploring the MiSTer & DE-10 Nano FPGA - Is this the future of Retro?

Posted on 2019-07-26, 14:33

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

386 and 486 mainboards with FPGAs on them are in my todo list 🤣.

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Re: Tube Time: Announcing The Snark Barker, a 100% Compatible SB 1.0 Replica!

Posted on 2019-07-26, 13:00

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

If one used metal film resistors for the entire analog section there would probably be a significant reduction in hiss.

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Re: Lowest CPU to play MP3s?

Posted on 2019-07-24, 05:27

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There's jsut way too much material out there in the format so it will never die even though I would much prefer to see FLAC and OGG to be the only things you can find lol. It doesn't help that many tools default to MP3 or outright won't support anything but non compressed and MP3 format. Popular …

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Re: BLASTERBOARD : A new SB 2.0-compatible ISA sound card

Posted on 2019-07-24, 05:23

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Wow, awesome ! Are you planning to document any of the findings somewhere ? I do have a question, where did you find information about the ADPCM formats ? I haven't actually found any resource that tells how to decode or encode PCM into the Creative's ADPCM flavor.

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Re: Possible to replace soldered 386SX-20 with 386SX or DX-40?

Posted on 2019-07-23, 13:20

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Another SX part can be put there but not a DX due to completely different pinout and package.

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Re: Soundmixer-Software for Win95?

Posted on 2019-07-23, 07:49

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

This is a limit of the codec chip, it doesn't have separate path for these things so you'll need to do either of the options you mentioned.

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Re: CRT gaming on period systems

Posted on 2019-07-23, 06:34

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

To achieve best blacks on CRT you need to lower the contrast to the point where black signal produces 0 cd/m2. The contrast setting (actually RGB gain) should be maximised to a point where no clipping artifacts appear (i.e colored trails can appear going right of white details, the cathode …

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Re: Lowest CPU to play MP3s?

Posted on 2019-07-22, 05:19

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I had hard time playing WAVs on a PC104 module based on AMD Elan520 (133MHz 5x86), and simply because it only had PIO HDD access. Playing over built in PCI 100Mbit network was fine though. MP3s weren't a problem on that board though sometimes there was stutter here or there when doing other things. …

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