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Re: Help needed: 486 Motherboard Repair (A-Trend ATC-1762)

Posted on 2023-06-12, 22:08

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think I may have a theory.. The top IC inside the KBC is a DM706N Hex Inverting Buffer. Pin 13 (A6) of that IC is connected to Pin 37 (KBCLK) of the KBC. Pin 12 (Y6) of the Hex Inverter has a damaged trace though. If you look at the photo with the KBC socket removed, it runs alongside Pins 4-3 of …

Re: PicoGUS: ISA sound card emulator with Raspberry Pi Pico (Gravis Ultrasound, AdLib, MPU-401, Tandy, CMS)

Posted on 2023-06-12, 21:07

in Marvin \ Sound

in Marvin \ Sound

You are too far away for me to feasibly donate boards I'm afraid 🙁 I'll be sure to buy you a Ko-Fi at some point though 😀

Re: Help needed: 486 Motherboard Repair (A-Trend ATC-1762)

Posted on 2023-06-12, 21:06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Pin 4 of the keyboard controller ("/RESET") is an active low reset signal. It may be high all the time, as it is active low. You might have trouble seeing a power-on reset on that signal when it's low for just 50ms after power on, but that would be fine. Pin 21 (CPU RESET, "P20") is an output …

Using the wavetable header as Line-In

Posted on 2023-06-12, 16:32

in Marvin \ Sound

in Marvin \ Sound

I just thought of something.. The wavetable header has Lef, Right and Audio Ground pins. What level is this audio input from the wavetable card? Can it be used to route any other input from internal Line Out sources such as a a GUS, a secondary sound card with a different FM implementation etc?

Re: Computer choices that is over kill or underpowered.

Posted on 2023-06-12, 13:55

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Honestly I can’t say I have found a huge need to have a dedicated windows xp machine at all. I’m sure there are games out there that need it but I’ve found that it doesn’t take much effort to get stuff playing just fine windows 10. Especially with GOG out there. XP is just similar enough to modern …

Re: PicoGUS: ISA sound card emulator with Raspberry Pi Pico (Gravis Ultrasound, AdLib, MPU-401, Tandy, CMS)

Posted on 2023-06-12, 05:12

in Marvin \ Sound

in Marvin \ Sound

Where do you live Ian? Asking to figure out shipping costs Also, what platforms do you need?

Re: Help needed troubleshooting non-working AT PSU

Posted on 2023-06-11, 20:28

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I just checked my box of switched and I only have 2 or 3 terminal switches. I ordered a few switches of the exact dimensions to replace the one on the PSU though. This one was a black rocker, the one I found convenient to order is a red rocker with an LED so I guess we are adding some RGB to my 286 …

Re: Orpheus II soundcard thread

Posted on 2023-06-11, 20:05

in Marvin \ Sound

in Marvin \ Sound

Marmes wrote on 2023-06-11, 13:28: You try and tell us🙂 There is no trolling like counter-trolling.

Re: Help needed troubleshooting non-working AT PSU

Posted on 2023-06-11, 19:27

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Not sure what you mean by this... these switches usually have two pairs of terminals, one pair for live (brown/black wires) and one for neutral (blue/white wires). But normally there is no ground involved. Can you take a picture of the back of the switch indicating which terminals are connected …

Re: The Retro Web project - a better stason.org/TH99 alternative

Posted on 2023-06-11, 19:20

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

New motherboard, not available on TheRetroWeb. Included is a POST screen image (No BIOS String for vendor, generic BIOS). I have not dumped the BIOS yet (I will). Any hep with ID would be appreciated.

Re: Help needed troubleshooting non-working AT PSU

Posted on 2023-06-11, 18:20

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

"Recap just to be sure" is not something I do often, it is usually a very unnecessary repair step. I would rather diagnose the problem first.

Re: Help needed troubleshooting non-working AT PSU

Posted on 2023-06-11, 16:33

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

weedeewee wrote on 2023-06-11, 14:33: All the electrolytic capacitors. even the smallest ones. I fail to see how any failing capacitor could be the cause for a dying mains power switch. They don't even fail short.

Re: hard disk size history

Posted on 2023-06-11, 15:49

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

robertmo wrote on 2023-06-11, 09:43: https://commons.wikimedia.org/wiki/File:Hard_ … ng=en#filelinks https://upload.wikimedia.org/wikipedia/commons/9/90/Hard_drive_c […] Show full quote https://commons.wikimedia.org/wiki/File:Hard_ … ng=en#filelinks This graph.. it is a testament to what a magical …

Help needed troubleshooting non-working AT PSU

Posted on 2023-06-11, 13:52

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So a strange form factor PSU came out of a desktop case I hope to use for a 286 build. The PSU is AT but the formfactor is strange, with a power button on the side which also serves as the case's power button. You can probably guess why I want to use it. Unfortunately, I can't. The first time I …

Re: Bought these (retro) hardware today

Posted on 2023-06-10, 18:58

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So I peeked into the horizontal desktop case, thinking it would be a 286 since it had what seems to be a very compact hercules graphics adapter marked GW-400 (Gainward I guess?) But it turned out to be a completely undocumented 386SX board labeled PETER-386SX. (Paging theretroweb guys..) It seems …

Re: Orpheus II soundcard thread

Posted on 2023-06-10, 10:41

in Marvin \ Sound

in Marvin \ Sound

DOS and Any system with ISA.

Re: Bought these (retro) hardware today

Posted on 2023-06-09, 12:14

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is this an XT psu and what is it doing in a 386sx build? I never before came across this kind of psu form factor before. I guess this was an 8086/88 that later got upgraded? That woulf explain the cheap Winbond Hercules card in it - they probably did not upgrade the video card. Smh.. No, XT PSUs …

Re: who does boardgames?

Posted on 2023-06-09, 12:01

in Milliways

in Milliways

I'm not a boardgamer but if you are interested in it we also have a thread about miniature painting and wargaming.

Re: Bought these (retro) hardware today

Posted on 2023-06-09, 05:47

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So I peeked into the horizontal desktop case, thinking it would be a 286 since it had what seems to be a very compact hercules graphics adapter marked GW-400 (Gainward I guess?) But it turned out to be a completely undocumented 386SX board labeled PETER-386SX. (Paging theretroweb guys..) It seems …

Re: When buying a 486 motherboard back in the day. What accessories came with it?

Posted on 2023-06-08, 16:31

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah, Socket 5 was when they became standard. I did get a serial/parallel breakout cable with a recent NOS 486 PCI board though 😎

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