Re: SC-55 vs SC-55MkII - Quest for Glory

Posted on 2020-10-28, 21:01

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by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

One big change between the SC-55 and SC-55mk2 was in the implementation of capital tone fallback. Search around in the forums and you'll learn more than you ever wanted to about CTF. It's one of those topics which provoke lots of complicated discussion, like people asking about the best sound card. …

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Re: Capacitor Replacement

Posted on 2020-10-27, 01:32

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by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I am working on replacing some capacitors on a few video cards... If the capacitor on the card was 1000uF 125 Degrees C, 6.3V, putting a 1000uF 105 Degrees C, 6.3V in its place would not be a good idea? Just curious as I have 105 Degree capacitors.......not 125. It really depends how cool the air …

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Re: MT32-PI and Roland UM-ONE

Posted on 2020-10-23, 18:17

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by gdjacobs

in MT-32 General

in MT-32 General

i am stuck in the exact same position on a RPI3A with UM-ONE cable ..i have send an email to Edu Arana asking for some clarifications. following the instructions from github i did some changes : usb = on gpio_baud_rate = 31250 gpio_thru = off output_device = i2s --> no output :( sample_rate = 96000 …

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Re: Emulating MT-32 on an RPi2

Posted on 2020-10-23, 18:16

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by gdjacobs

in MT-32 General

in MT-32 General

Qjackctl or any of the visual patch bay utilities (patchage, for instance) should do the trick. IIRC there was some difference in terms of which API layers have been activated by Munt. Testing required! I usually use the 'Midi Through' devices to make the virtual connections a little more flexible. …

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Re: Emulating MT-32 on an RPi2

Posted on 2020-10-18, 06:14

by

by gdjacobs

in MT-32 General

in MT-32 General

appiah4 wrote on 2020-10-16, 08:09: I believe the Linux kernel comes with all necessery modules for a USB MIDI input? For any devices that are class compliant, yes.

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Re: Emulating MT-32 on an RPi2

Posted on 2020-10-15, 21:49

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by gdjacobs

in MT-32 General

in MT-32 General

Hi, is it possible to play notes from a USB Midi Keyboard controller like a "Akai MPK Mini" or an "MAudio Axiom Air Mini 32" straight to a Pi with MT32-Pi installed? It'll work using a DIN interface, but I'm not sure if USB will. The Circle documentation hints that this should work as long as the …

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Re: Best game to test Roland LAPC-i

Posted on 2020-10-13, 02:21

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by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

Lure of the Temptress uses CM-32L sounds extensively, and it's free.

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Re: Bought these (retro) hardware today

Posted on 2020-09-10, 22:52

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by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

appiah4 wrote on 2020-09-08, 11:26: Teapos from 14-15 year ago are the epitome of capacitor plague in my experience, all my Socket A stuff with Teapo caps bulged and leaked. Teapo low/ultra low ESR caps are crap. More general purpose Teapo caps are better.

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Re: Seeking suggestions for first ISA model sound card for new dos rig

Posted on 2020-09-05, 06:16

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by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

On the bright side, the ALS100 is SB Pro compatible and does support the SB16 instead, which almost has the same capabilities as WSS (SB16: 16bit, stereo 44Khz).. 🙂 Almost, but not quite: WSS specifies 48kHz. 44 vs 48kHz is the whole sampling rate problem. Whether this is at all relevant here is a …

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Re: Can this Pentium 100 motherboard accept Pentium MMX CPU?

Posted on 2020-09-04, 04:13

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by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

30 pins. Should be good.

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Re: Seeking suggestions for first ISA model sound card for new dos rig

Posted on 2020-09-02, 14:30

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by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

Requirements: stereo sound blaster 16 support A real OPL3 wave table header Midi connector Wishlist: Obtainable 😂 No hanging note bug I am not sure how important the hanging note thing is, but it comes up a lot. Anyway, I am looking for suggestions of some models that have these features and are …

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Re: Enough CPU power for calculating disk space / disk sizes.

Posted on 2020-08-31, 18:47

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by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I like to know how big harddisk size could handle my systems, before the cpu would getting to overloaded/ bottlenecked. HDD PIO modes will use the same amount of CPU time for a given transfer rate, but size doesn't really impact that metric. You will run into issues with controller, BIOS, and …

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Re: Need help identifying surface mount cap

Posted on 2020-08-30, 21:23

by

by gdjacobs

in Marvin \ Video

in Marvin \ Video

Those look like Sanyo EX hybrid caps, 470uF, 6.3V. http://www.paullinebarger.net/DS/Sanyo/ ... Series.pdf

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Re: Bought these (retro) hardware today

Posted on 2020-08-29, 03:54

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by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello friends! So, a few days back I provided a sneak preview of some of the goodies I've recently picked up. It's been an absolutely crazy few weeks where I've acquired some pretty cool stuff. So first, let's start with 3Dfx ( oh, how I LOVE 3Dfx! ).. The first is the set of 4x Quantum3D Obsidian2 …

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Re: ESS AudioDrive (ES1868) - a surprisingly good ISA sound card

Posted on 2020-08-29, 03:27

by

by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

Does your card have a built in MIDI synthesizer? If not, do you have a MIDI daughter board or external module? Most sound cards, including most based on the ES1869, only provide the MPU401 MIDI interface but no way of internally converting MIDI instructions to sound.

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Re: Types of capacitors to recap computer stuff (motherboard and PSU)

Posted on 2020-08-29, 03:22

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah, for PSUs of the P4/XP era stuff like Nichicon UPW should be fine, low ESR but not "ultra-low". I have read about several instances of people attempting polymods on power supplies from that era and they usually have problems like canthearu said (due to the feedback loop being affected I …

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Re: List of open-source PC hardware projects

Posted on 2020-08-29, 03:08

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

HardMPU HardMPU, anyone?

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Re: Can this Pentium 100 motherboard accept Pentium MMX CPU?

Posted on 2020-08-29, 02:19

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

What board have you got? Edit: NM, I see. I think it could definitely be done. You'd probably want to use an adjustable voltage regulator chip driving an external pass element. Ideally it would have an output pin indicating operation in or out of regulation. You'd probably want two MOSFETs to float …

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Re: Will this run Munt?

Posted on 2020-08-28, 15:24

by

by gdjacobs

in MT-32 General

in MT-32 General

Unfortunately, there are really not many possibilities for parallelisation in mt32emu. The synth changes its state on the per-sample basis, it's very difficult (if possible) to predict all the internal parameters in advance, so rendering different partials in parallel seems to be the only option. …

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Re: Can this Pentium 100 motherboard accept Pentium MMX CPU?

Posted on 2020-08-28, 15:16

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Kreshna, have you got an existing PMMX regulator module? If it's linear, it might be straightforward to modify the set point and add some cooling to the pass element.

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