Re: Apparent ground loop between devices connected to a single AC circuit (same outlet, actually)

Posted on 2020-08-11, 06:54

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

You get ground loops through monitor and power cables (in my case KVM is the major source) so it more or less is unavoidable when there are multiple devices. If you really want to get rid of them without harming sound (those isolators typically use a transformer and it will limit low freq response …

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Re: My Toshiba T3200 Luggable 286

Posted on 2020-08-09, 13:28

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have one such machine too and I would love to see that memory expansion up close, since ideally I would like to make my memory own expansion. The HDD you essentially cannot replace, the machine uses a custom controller and interface which is specific to it. If the HDD dies in some way the machine …

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Re: Testing capacitors in circuit

Posted on 2020-08-09, 13:21

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You cannot test power related parts in circuit for the most part, since they are in parallel with many other capacitors on the same power rail, giving you bogus results. You can get a collective reading of all the parts on that same power rail but not of a single part without separating from the …

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Re: If you were able to go back say 15-20 years ago what one motherboard would you buy ?

Posted on 2020-08-01, 17:14

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I would get all the full ATX Tualatin boards with ISA slot(s) 🤣

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Re: Novell suggestion: upgrade your PC speaker

Posted on 2020-08-01, 17:12

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

I simply run the signal to PC-speaker input of a sound card when present, solves all the problems. Piezo drivers are awful though and upgrade may be worthwhile.

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Re: Analog composite video output on PCs - how do 70 Hz modes even work?

Posted on 2020-07-31, 17:49

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by Tiido

in Marvin \ Video

in Marvin \ Video

All the video cards I have with composhit/S-video output always show 576i (50Hz) or 480i (60Hz), and typically with tearing, not skipped frames. Result is a blurry and flickery mess that doesn't look all that nice for the most part. I don't have access to a working TV right now to test out various …

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Re: 945ISA Motherboard - DMA... not working?

Posted on 2020-07-31, 09:46

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

And you won't be getting AWE cards work on that board, because the LPC to ISA bridge doesn't support enough IO ranges to cover what AWE needs (e.g 22x, 62x, A2x and E2x), so for example you would need to drop FM and MPU401 support to get EMU8000 working.

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Re: ATI Windows 9x DDC/EDID override

Posted on 2020-07-30, 01:41

by

by Tiido

in Marvin \ Video

in Marvin \ Video

I was getting the panning too. Even with the monitor INF installed that specifies 2560x1440 and the supported frequencies, the ATI driver prioritizes the 1080p EDID. I wonder why it isn't entirely working for you. Is the "detect Plug and Play monitors" checkbox on the monitors panel in display …

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Re: Overheating EMU8K on AWE32 CT2760

Posted on 2020-07-28, 02:18

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Latchup usually results in (partially) non-functional device but these are having no problems that one can observe, all functions seem to work...

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Re: ATI Windows 9x DDC/EDID override

Posted on 2020-07-28, 02:12

by

by Tiido

in Marvin \ Video

in Marvin \ Video

I hoped this would be able to defeat the "panning" I get from higher resolutions than 1600x1200 but unfortunately it didn't, I did get ability to use much higher refresh rates though ~

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Re: Overheating EMU8K on AWE32 CT2760

Posted on 2020-07-27, 23:51

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

I measured the temps on 3 cards I have with the IC405A and they all reached 67ºC when read with my IR thermometer. They should certainly be heatsinked, like Voodoo cards with their scorching hot chips...

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Re: Broken SCC-1?

Posted on 2020-07-23, 02:14

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Wrong sounds indicate problem with the sound chip (the biggest one on the board), or stuff connected to it. I would look closely at sample ROMs, the photos shown of the top of the board don't seem to show any issues but there might be a damaged trace on other side of the board...

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Re: Need a DIY MIDI FM synth module

Posted on 2020-07-23, 02:12

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Basically what is asked for does not exist, someone needs to make such a thing first. There are various things using various Yamaha FM chips but none of them fulfill the requirements listed.

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Re: PC-104 board found

Posted on 2020-07-18, 23:15

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

PC104 to ISA is indeed quite straightforward : http://www.tmeeco.eu/BitShit/PC104toISA.jpg http://www.tmeeco.eu/BitShit/PC104internet.jpg I upgraded one 386SX board to a 40MHz one not so long ago : http://www.tmeeco.eu/BitShit/PCschit/SX25toSX40a.jpg

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Re: Looking for VLB 100MBit NW card - existing?

Posted on 2020-07-12, 10:24

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

VLB IO card that is in my todo list has a 1Gbit NIC component but when it ever gets built I have no idea 🤣

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Re: Sound Blaster 16 Bugs and Deficiencies Summary

Posted on 2020-07-07, 14:04

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Does the CT1745A mixer operate at line-level? I know it's an analogue mixer, but I want to know where the analogue signal is modified. I assume the volume control is inside the CT1745A? That chip certainly plays a role as all the signal go through it, it is what applies the volume controls etc. and …

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Re: What do these pins mean? (ESS Solo 1 ES1938S)

Posted on 2020-07-05, 12:58

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

"Side band" should be for PC/PCI aka SBlink header, to gain better ISA compatibility for DOS games. "I2S IN" is a form of digital sound input and the "mono" should be an additional analog input. You need jumpers on J12+13 to have sound output, preferably in Line setting as it is less noisy and …

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Re: Zilog Z80 drop-In Replacement

Posted on 2020-07-03, 13:58

by

by Tiido

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

MSX TurboR machines have something that sort of fits the bill, no pin compatibility though...

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Re: What are the hurdles to creating a PCI Adlib sound card?

Posted on 2020-07-01, 17:57

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Whoops, fixed that. No such chips exist. The wavetable aspect is simply hooking stuff to the MIDI TX signal and mixing the analog output to your final output. Typical waveblaster setup that every card can support that has a MIDI UART present.

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Re: What are the hurdles to creating a PCI Adlib sound card?

Posted on 2020-07-01, 06:47

by

by Tiido

in Marvin \ Sound

in Marvin \ Sound

Of course there must be responses possible, otherwise games cannot detect the FM chip. FIFO would be one way to reduce overheads, but then you begin to enter FPGA territory for things. It isn't a super trivial thing to do, which is why nobody has done it yet but it certainly is possible to do. …

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