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

Posted on 2020-08-31, 18:47

by

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 …

---

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

---

Re: Bought these (retro) hardware today

Posted on 2020-08-29, 03:54

by

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 …

---

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.

---

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 …

---

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?

---

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 …

---

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. …

---

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.

---

Re: Will this run Munt?

Posted on 2020-08-28, 05:54

by

by gdjacobs

in MT-32 General

in MT-32 General

Munt in a single process, multi-threaded environment on FreeRTOS, RTEMS, or similar? I can dream, right?

---

Re: Sb16 Value CT2770 with CT1747 OPL chip - any good? What can you tell me about it?

Posted on 2020-08-28, 05:52

by

by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

I'd suggest arriving at your own conclusions, rather than relying on the profound amount of subjective, non-academic (mis)information floating around this forum. Per my own testing, differences in the various CODEC chips (CT1701 and CT1703 alike) do not account for any measurable noise differences, …

---

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

Posted on 2020-08-28, 05:26

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Pardon the necro. I recently bought XVI 073-20742-30 VRM, whose output voltage is 1,3-3,5V. At first, I was happy with the specs, since its output voltage seems to be able to acommodate a wide range of CPU (AMD K6-2, being 2.2v, falls into the range). But much to my dismay, the VRM's input voltage …

---

Re: Replacement capacitor recommendation

Posted on 2020-08-28, 00:03

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'd probably have said something similar if I hadn't tested and used them first hand. These caps have remained stable in long term use without leaking, bulging or altered characteristics like ESR changes or lost capacitance. I don't think the Chengx/Chengxing caps I have are the same ones found in …

---

Re: Will this run Munt?

Posted on 2020-08-27, 02:42

by

by gdjacobs

in MT-32 General

in MT-32 General

From the user side, I generally agree with you and don't think there's a lot of cause for multithreading the render code TBH. We can run Munt on very inexpensive SBCs, old Intel Atom netbooks/nettops, and such in real time. In my post earlier, I merely wanted to point out (mostly for the OP) that …

---

Re: Low volume out of Cobra AW744L II card

Posted on 2020-08-27, 01:59

by

by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

Are any of the capacitor pads connected to data pins on the PCI slot? Termination impedance will generally be more critical than power plane decoupling.

---

Re: Es1869 IDE port and optical drive help

Posted on 2020-08-27, 01:55

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Changing to IRQ 12 (the config software didnt offer 14 or 15) with esscfg and that seems to have worked. I ran msd.exe and looked at the IRQs in use, looked like IRQ 9 was being used by something in the system already so an IRQ conflict must have been the issue. Thanks! IRQ 9 is used by ACPI on …

---

Re: Turn on AT PSU without Motherboard

Posted on 2020-08-27, 01:35

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You'll need to provide a minimum load, else it won't start or the voltages will be all over the place. I keep a couple of dead HDDs (that are still spinning) for this purpose. The voltages might still be a bit off with such a light load, but at least you'll know if it's safe to use it to power a …

---

Re: Sb16 Value CT2770 with CT1747 OPL chip - any good? What can you tell me about it?

Posted on 2020-08-26, 18:53

by

by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

I thought majority of the noise was due to the CT1703 DAC revision used on the card? Interesting. I always wrote mine off because it has a CT1703-T which is considered noisy. Incidentally, my CT2770 has a CT1745-S, is this a more or less desirable mixer chip? EDIT: I just noticed my card also has …

---

Re: Turn on AT PSU without Motherboard

Posted on 2020-08-25, 22:36

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There do exist AT PSUs with a power switch on the back instead of cords that carry to the front. Why this is, I don't know. But I have one and use it myself to test motherboards with AT power connectors. Early generation machines. Front power switches are way more convenient, so they quickly became …

---

Re: Will this run Munt?

Posted on 2020-08-25, 06:52

by

by gdjacobs

in MT-32 General

in MT-32 General

Define MUNT :) To be serious, the mt32emu library itself is nearly agnostic to multithreading, but applications that utilise the library are known to be thread-aware. For example, DOSBox (with the mt32emu patch) can render MT-32 audio in 1 thread and emulate the rest of the world in the other. As …

---