Re: PicoGUS: Gravis Ultrasound emulator on an ISA card with Raspberry Pi Pico

Posted on 2023-02-06, 14:51

by

by krivulak

in Marvin \ Sound

in Marvin \ Sound

GUS (2.4 anyway) has a fairly aggressive LPF on its DAC output, making for relatively muffled sound (I recall something like 14kHz cutoff freq) that I "fixed" on my board by changing two capacitors to get the cutoff at the near 20kHz, roughly same as the DAC used here is doing. The nice and clear …

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Re: PicoGUS: Gravis Ultrasound emulator on an ISA card with Raspberry Pi Pico

Posted on 2023-02-05, 22:42

by

by krivulak

in Marvin \ Sound

in Marvin \ Sound

So, new day, new firmware, new reports! First I should mention what the heck am I testing the hardware on. Haven't noted it before if I remember correctly. SO: The board was forged in the year 1993 in a quite big company called Shuttle and it was given name HOT-419 because it was the new hotness, …

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Re: PicoGUS: Gravis Ultrasound emulator on an ISA card with Raspberry Pi Pico

Posted on 2023-01-23, 18:27

by

by krivulak

in Marvin \ Sound

in Marvin \ Sound

So - I tried the new update. Just superior and awesome work, I wouldn't be able to achieve any of this (since I super duper hate programming - that's why I am amazed by anyone who likes it) But I think some info from testing would be more interesting than my rambling. Don't take any of this as …

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Re: PicoGUS: Gravis Ultrasound emulator on an ISA card with Raspberry Pi Pico

Posted on 2023-01-14, 11:48

by

by krivulak

in Marvin \ Sound

in Marvin \ Sound

Well that's some fantastic news! Can't wait to give it a spin 😁

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Re: PicoGUS: Gravis Ultrasound emulator on an ISA card with Raspberry Pi Pico

Posted on 2022-12-26, 08:40

by

by krivulak

in Marvin \ Sound

in Marvin \ Sound

I've found the main reason why DMA is not working – port IO can occur in the period of time between the GUS asserting DRQ and it getting DACK in return. Handling this properly has been challenging, as timing in this situation can be really tight. *** Maybe this is the reason why the original …

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Re: PicoGUS: Gravis Ultrasound emulator on an ISA card with Raspberry Pi Pico

Posted on 2022-12-16, 21:24

by

by krivulak

in Marvin \ Sound

in Marvin \ Sound

Firmware v0.2.0 is here, hot on the heels of v0.1.0... *** * Super-unstable DMA support preview. Count on it to fail, but feel free to celebrate when it works! 😅 Went ahead and tried a couple of different things to see what does not work and what doesn't either. :D First I tried Doom. Didn't work. …

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Re: PiGUS: Gravis Ultrasound emulator on an ISA card with Raspberry Pi

Posted on 2022-12-01, 10:50

by

by krivulak

in Marvin \ Sound

in Marvin \ Sound

Thats really nice! I expect this not to work on a NuXT Turbo XT due to the 8 vs 16 bit bus? Or is the 16 bit bus on the PiGUS optional? The card is 100% 8-bit, the 16-bit extension is just passthrough for another cards, so it will totally work in 8bit bus. As a matter of facts, I was debugging it …

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Re: PiGUS: Gravis Ultrasound emulator on an ISA card with Raspberry Pi

Posted on 2022-11-30, 22:20

by

by krivulak

in Marvin \ Sound

in Marvin \ Sound

So... The prototype boards came and I assembled it. And I am quite happy! IMG_0573.JPG I created a short video about the project so if you want, you can take a look at it and enjoy my happiness. https://youtu.be/VZuFstWoktI Hope Ian will write support for games since when this will be working, it …

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Re: Can this Gravis Ultrasound PnP be repaired?

Posted on 2022-11-11, 07:31

by

by krivulak

in Marvin \ Sound

in Marvin \ Sound

That's something I explicitly tested: pulling the PAL did nothing to the function of the Interwave as a soundcard. ... I definitely agree there and that's something that could even disable (but not necessarily destroy) the Interwave (it's the internal memory address and databus of the interwave, …

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Re: Can this Gravis Ultrasound PnP be repaired?

Posted on 2022-11-10, 22:40

by

by krivulak

in Marvin \ Sound

in Marvin \ Sound

From what I have read so far and what I can reply to - pulling the PALCE16V8H chip is basically equivalent to pulling the card out of the computer. The programmable array logic is dealing with addressing of the Interwave so without address the card is virtually non-existant for the computer hence …

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Re: PiGUS: Gravis Ultrasound emulator on an ISA card with Raspberry Pi

Posted on 2022-11-01, 15:24

by

by krivulak

in Marvin \ Sound

in Marvin \ Sound

Just looking at the rendering I'm wondering if the line-out (and maybe other parts) are gonna fit between two PCBs (even more with maybe other parts mounted on the SBC it's probably gonna sit on). In the rendering it at least looks to be higher than the connector. Exactly my thoughts hence why I …

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Re: PiGUS: Gravis Ultrasound emulator on an ISA card with Raspberry Pi

Posted on 2022-10-31, 19:41

by

by krivulak

in Marvin \ Sound

in Marvin \ Sound

Wow! This is so cool to see. It's so similar yet so different. You are free to modify my design! I've used the CERN OHL v2 Permissive license, which requires the work I've done to keep its license notice, but you are free to change anything else. Nice, so glad to hear that! Today I modified the …

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Re: PiGUS: Gravis Ultrasound emulator on an ISA card with Raspberry Pi

Posted on 2022-10-30, 20:34

by

by krivulak

in Marvin \ Sound

in Marvin \ Sound

Hi, yesterday I've got a PicoGUS PCB as a gift and because of that I became interested in this topic and then I thought - why not go PC/104? What do you think? Can I make it? I am not sure about the license stuff... Kept everything the same, just added my name as a "modificator" photo_2022-10-30_21- …

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Re: Roland MT32 - Direct Connection to Serial / COM1 SoftMPU

Posted on 2022-01-02, 16:22

by

by krivulak

in SoftMPU

in SoftMPU

Indeed I did. I was plugging it blind by reaching my hand behind the computer and both ports are on top of each other. Plugged it in without knowing it is the wrong plug and then proceeded to make myself angry because it didn't work. Whoops

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Re: Roland MT32 - Direct Connection to Serial / COM1 SoftMPU

Posted on 2022-01-01, 22:12

by

by krivulak

in SoftMPU

in SoftMPU

Thanks guys. It turns out - yes, it is me who is stupid. Just brew myself a cup of tea, sat down and start thinking why the frick it is not working. Can you spot what's up? 😁

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Re: Roland MT32 - Direct Connection to Serial / COM1 SoftMPU

Posted on 2021-12-30, 18:49

by

by krivulak

in SoftMPU

in SoftMPU

Okay, I don't know if I am stupid or what the heck is going on but I got SC55 Mk2 which should be able to use the COM port communication. Also I got the original Roland RST-15AT cable and when I tried to plug it in and set up the same way as shown in the video, nothing happens. I tried to google a …

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Re: Cracked chip

Posted on 2021-02-17, 12:08

by

by krivulak

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Wow, that is necroposting and a half... Anyway, after the years I found out that this kind of a board is a piece of $#!t... Had 5 of them in my possesion, all of them dead with no apparent reason. Seems like the chipset tends to die somehow.

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Kickstart POST card

Posted on 2020-10-31, 09:46

by

by krivulak

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, Some time ago I got this card. P_20190902_160410.jpg P_20190903_221556.jpg It is an oldschool POST card with more features built in. In the box it came with three dongles and three EPROMs with some features. The deal is, of course, mine came with no EPROM whatsoever, it is a dumpster saved card. …

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BIOS needed for Forex chipset 386 board

Posted on 2020-10-08, 20:05

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by krivulak

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, I got my hands on a nice 386 motherboard. Problem is that somebody threw it to the recycling facility and it got stripped from all chips including BIOS. I can not find usable copy anywhere. P_20201008_215511.jpg Phil from Philscomputerlab has similiar one on his website, but sadly he does not …

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Re: How about a MR-BIOS ROM file repository?

Posted on 2020-02-16, 11:50

by

by krivulak

in Marvin \ Software

in Marvin \ Software

Huh... I just got my hands on a Forex 421 based board, but without BIOS. When Google found this post, my heart jumped a little, but seems that I have no luck... Anyway, on one computer I have MR BIOS, I think the board is Octek Hippo OP. For sure I will take a look if I could back it up

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