Re: Can you remove the built-in switch on an AT PSU?

Posted on 2020-07-05, 06:35

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@Mattyice1994, I understamd what you're trying to do but unless I'm mistaken the small white box isn't what you think it is but is in fact ferrite (core) choke like this one I removed from an AcBel PSU from an IBM server. PSU Ferrite Choke.jpg Looks like it to me, as well. The existing switch seems …

---

Re: What are you eating/drinking? (the vogons food thread)

Posted on 2020-07-05, 04:03

by

by gdjacobs

in Milliways

in Milliways

Invited the family over to my place for a Canada day pancake brekky! w00t w00t! I love pancakes. I can enjoy it with anything over it, from a simple butter, to jam and why not peanut butter... yummy. I ate these things (the toppings, not the pancakes) with waffles some weeks ago. Do you do them …

---

Re: Emulating MT-32 on an RPi2

Posted on 2020-07-05, 03:00

by

by gdjacobs

in MT-32 General

in MT-32 General

Noice!

---

Re: ISA soundcard won’t work on midi irq2/9

Posted on 2020-07-04, 20:42

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

jakethompson1 wrote on 2020-07-04, 04:55: He's talking VLB so pretty confident to say there is no ACPI 😁 True dat. Didn't notice he's rocking a 486. 🙁 If it's just the PIC reserving the IRQ, you should be okay.

---

Re: Roland MT-32

Posted on 2020-07-03, 20:25

by

by gdjacobs

in MT-32 General

in MT-32 General

Old hardware is always fun, although I'm not aware of a significant technical reason to prefer it. In general, Munt is now extremely accurate, although the legality of the ROM files is a grey area. You can check with sergm if you have questions about specific hardware versions, their bugs or quirks, …

---

Re: ISA soundcard won’t work on midi irq2/9

Posted on 2020-07-03, 00:42

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

IRQ 2/9 is used by ACPI. Can you disable it and go with APM or no power management at all?

---

Re: PSU Voltage Concerns

Posted on 2020-07-03, 00:41

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That Jeantech is using Teapo capacitors. They're second tier but probably fine in this application (assuming there's a good path for air past that toroidal choke). Other than not going with Jap caps, it doesn't look like they skimped much component wise. The board looks fully populated and …

---

Re: Possibly crazy idea : using a Raspberry with Jack and something like JackMix to have "create" a software S/PDIF mixe

Posted on 2020-07-03, 00:01

by

by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

Pretty sure that's what the ones on Aliexpress are using. Likely your best bet, although I haven't messed with SPDIF input to know how solid that is with those parts. I've got one on hand, so it's maybe something to do tonight...

---

Re: Possibly crazy idea : using a Raspberry with Jack and something like JackMix to have "create" a software S/PDIF mixe

Posted on 2020-07-02, 19:11

by

by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

My goal is 3 or 4 inputs . That seems within reach of even USB 1.1, in theory . Assuming you're not restricting sampling rate or bit depth, you'll need 196608 /s sample rate * 24 b sample bit depth * 2 channels per I2S port for a grand total of 9437184 b/s per I2S port. Looking at Aliexpress, it …

---

Re: Bought these (retro) hardware today

Posted on 2020-07-01, 23:26

by

by gdjacobs

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just won this Asus P2B-DS auction with a Make Offer deal for $119. (including RAM and CPU's) Now I can build my dually tually with two Upgradeware Slot-T slocket adapters. Going to load the beta BIOS, do the multiplier and voltage mods, then it should be good to go. I only have to modify one of my …

---

Re: virus on vogondrivers

Posted on 2020-07-01, 23:10

by

by gdjacobs

in Marvin \ Software

in Marvin \ Software

Tetrium wrote on 2020-06-26, 10:16: And wouldn't wanting to moan a lot actually be a good reason to come here and moan? 😜 Depends what's causing the moan. Some things just aren't good for general display.

---

Re: Retro OSes for retro computers

Posted on 2020-07-01, 23:07

by

by gdjacobs

in Marvin \ Software

in Marvin \ Software

Kind of a bittersweet story. Terry Davis was the author of TempleOS. I'm happy the project gave some direction to his life and he certainly had good skills as a programmer, but what ultimately happened to him was a tragic example of the terrible cost payed by those who suffer from mental illness.

---

Re: Newbie Questions about Sound Blaster Compatible Cards

Posted on 2020-07-01, 22:56

by

by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

I neglected CS4232 because they can be paired with different chips to different results. ES688 is non-pnp so not a great pair for the system in question (also a tad difficult to set up with jumpers on undocumented cards, and the MPU401 is a bit of a hassle). OPTi and ALS cards vary too wildly in …

---

Re: Newbie Questions about Sound Blaster Compatible Cards

Posted on 2020-07-01, 20:49

by

by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

An ISA card with the following chipsets will cover you well: Yamaha YMF718/719 ESS ES1688/1868 Crystal CS4236/4237 C-Media CMI8330 Alternatively just go for a Creative Sound Blaster AWE64 Value Also, Aztech cards (different generations have different features and are compatible with different SB …

---

Re: Possibly crazy idea : using a Raspberry with Jack and something like JackMix to have "create" a software S/PDIF mixe

Posted on 2020-07-01, 19:24

by

by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

You can find cheap USB analog audio dongles on eBay. Even if they don't work for your final product, you'd be able to generate the kind of expected I/O load and prove the concept. You probably could capture additional channels of I2S directly through the GPIO pins instead of via the two I2S channels …

---

Re: Possibly crazy idea : using a Raspberry with Jack and something like JackMix to have "create" a software S/PDIF mixe

Posted on 2020-07-01, 15:59

by

by gdjacobs

in Marvin \ Sound

in Marvin \ Sound

The RPi series is known to be problematic wrt heavy USB I/O, although there are workarounds which can help. The Pi 4 might be better. Probably a better solution is to use an inexpensive DSP chip for summation of multiple I2S sources with programmable gain. Scale the DSP according to the serial …

---

Re: nearly got ran over by a young dude on a moped...

Posted on 2020-06-30, 23:17

by

by gdjacobs

in Milliways

in Milliways

brostenen wrote on 2020-06-13, 06:59: I just thought that "Collecting rant" was a tread to collect rants in, and not a tread about hardware-collectors-ranting. That's fair. Not something I'm worried about.

---

Re: Ocean view from the highest mountain

Posted on 2020-06-30, 22:41

by

by gdjacobs

in Milliways

in Milliways

It's like two thirds of a haiku.

---

Re: Apple is getting off Intel CPU’s ?

Posted on 2020-06-30, 22:37

by

by gdjacobs

in Milliways

in Milliways

I think Apple customers who do high end processing in video editing value there time. So the less time they spend editing and rendering a video is most important for them. If they can do it with a 32-core AMD CPU and dual graphics cards for half the cost of a NEW Base model Mac Pro and in 1/2 the …

---

Re: Emulating MT-32 on an RPi2

Posted on 2020-06-30, 21:57

by

by gdjacobs

in MT-32 General

in MT-32 General

No need for an HDMI output. You can tunnel X11 through SSH or use a protocol like VNC or NX to run graphical software to a remote station. Not saying it's the most practical approach, but it does give you extra options and more flexibility you can experiment with.

---