Re: Lion King does not play stereo on SB16

Posted on 2023-04-14, 00:28

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by anetanel

in Marvin \ Software

in Marvin \ Software

I attached recording of the title song in SB and SB16 modes. Filename lk-sb.mp3 File size 799.69 KiB Downloads 41 downloads Filename lk-sb16.mp3 File size 1.2 MiB Downloads 38 downloads

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Lion King does not play stereo on SB16

Posted on 2023-04-13, 23:59

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by anetanel

in Marvin \ Software

in Marvin \ Software

I'm running a 486 DX33 with a CT4170 (VIBRA16x PnP), and trying to get decent audio in The Lion King on DOS. The card is configured with ADDR 220, IRQ 5, LOW-DMA 1 and HI-DMA 1. The only (relevant) sound card option in the original INSTALL.EXE program is "Sound Blaster", which results in a rather …

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Re: Etherexpress Pro/10+ Packet Driver issue / help needed

Posted on 2023-04-11, 22:56

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by anetanel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Sorry for the resurrection, but I had the same issue today and I believe I (accidentally) found a solution. TL;DR make sure that the Flash chip address is shadowed in BIOS settings. I'm using the flash on the NIC to boot XT-IDE, and I usually remember to shadow the Flash address, to improve disk …

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Re: Simple DIY Turbo LED Display

Posted on 2023-04-04, 13:53

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by anetanel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You'd have to design your own using a software like KiCAD, Altium, Eagle, etc. But yes, I have already made several turbo displays. The projects are posted here on Vogons and on my Github. Oh I didn't realize you're the author of this: https://www.vogons.org/viewtopic.php?f=46&t=70370 :) I don't …

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Re: Simple DIY Turbo LED Display

Posted on 2023-04-04, 13:16

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by anetanel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, the 10-pin display needs to be multiplexed, so you're going to need integrated circuits, unless you want to build the entire thing out of discrete gates using transistors which would be ginormous. That's what I was afraid of. I guess I'll wait for the 16 pin display to arrive. BTW, I had an …

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Re: Simple DIY Turbo LED Display

Posted on 2023-04-04, 11:48

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by anetanel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Many original turbo displays just used some simple transistors to perform the display switching. You can view old datasheets for them, since some show the circuit design. Example.. Thanks, I actually found that too, but I think that this diagram is for a 16 pin display which can address each …

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Re: Simple DIY Turbo LED Display

Posted on 2023-04-04, 10:45

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by anetanel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Any idea where I can find an example of such circuit?

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Simple DIY Turbo LED Display

Posted on 2023-04-04, 08:14

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by anetanel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I wish to create a very simple Turbo display, which will toggle only between HI and LO. Planning to follow this guide: https://oldcomputer.info/hacks/ledhilo/index.htm I ordered a 2 digit 7 segment display , but it is using only 10 pins, which to my understanding require some more sophisticated …

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Re: Short on +5v rail on DSP-1454NN AT PSU

Posted on 2023-03-30, 08:08

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by anetanel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I will do as you said and start examining the components to the best of my ability. I started with overlaying the pcb solder side over the component side so it will be easier to identify each component from the back. If you are not in a hurry you can wash that PCB in running water. Some solid soap …

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Re: Short on +5v rail on DSP-1454NN AT PSU

Posted on 2023-03-28, 10:57

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by anetanel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, now you need to decide if you want to continue or not - because this will not be an easy case and it very well might turn out to be a lost cause (for example a short in the transformer) which is very frustrating (and so can be the investigation into cause quite frankly, although that is at …

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Re: Short on +5v rail on DSP-1454NN AT PSU

Posted on 2023-03-28, 09:32

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by anetanel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I sacrificed my last fuse to take a slow motion video... The flash was indeed from the fuse 😅 Took the breaker with it too this time 🤣 https://youtube.com/shorts/vQGyni7jwGo

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Re: Short on +5v rail on DSP-1454NN AT PSU

Posted on 2023-03-28, 08:06

by

by anetanel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'd say go for it, keep the load but use no bulb. Direct connection to mains - after all it does have a fuse and it did improve the regulation going from 60W to 100W current limiter. Perhaps it really needs to see higher input voltage after all. It's still weird that all it took to work again was …

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Re: Short on +5v rail on DSP-1454NN AT PSU

Posted on 2023-03-26, 21:10

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by anetanel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

BTW, I'm running the PSU on 220v. Is it ok that I used 3A diodes? No. Diodes where were put in? And current rating and type of diode is *required* specific to power supply outputs. On outputs for 5V, 12V etc, you have to exceed the max current of the 5 or 12V output, and if it is a 20A on this 5V …

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Re: Short on +5v rail on DSP-1454NN AT PSU

Posted on 2023-03-26, 20:13

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by anetanel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

BTW, I'm running the PSU on 220v. Is it ok that I used 3A diodes?

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Re: Short on +5v rail on DSP-1454NN AT PSU

Posted on 2023-03-26, 20:08

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by anetanel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I was able to find a 100w bulb. Yiu can't buy new incandescent bulbs any more where i live. Luckily my father in law seems to be a light bulb horder 😝 Anyway, with the 100w bulb and the 2 12v bulbs, the voltage on the 5v rail is about 4.4v and on the 12v rail it is about 10.4v... The 100w bulb …

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Re: Short on +5v rail on DSP-1454NN AT PSU

Posted on 2023-03-23, 18:00

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by anetanel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I took a chance and resoldered the transistors. When powering the PSU with the 12V bulbs and the 60W bulb-cable, The 12v light up a bit, and the PSU fan starts spinning. The 60W bulb stays lit. Not very brightly, but also not so dim as before I replaced the transistors. I measured the voltage on the …

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Re: Short on +5v rail on DSP-1454NN AT PSU

Posted on 2023-03-23, 16:51

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by anetanel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Progress! :) I replaced the faulty diode with the new 3A/1000v one. Also removed the transistors and soldered back the double diode. Now when powering the PSU, the light bulb lights up and goes dim! Does this mean that we're back in working order? Should I solder the transistors back? replace the …

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Re: Short on +5v rail on DSP-1454NN AT PSU

Posted on 2023-03-23, 12:38

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by anetanel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

BTW, all I could find locally is a 3A/1000V diodes, and I plan on replacing all 4. Should be fine, right?

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Re: Short on +5v rail on DSP-1454NN AT PSU

Posted on 2023-03-23, 12:34

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by anetanel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

0.22 Ohm is "almost" a short in fact. Yeah, I guess it is working as expected then. I'm watching a video right now about the thermistor's role in the PSU, and from my understanding it's resistance should be high at first and get lower with time and heat. A bit weird that this resistor is in place …

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Re: Short on +5v rail on DSP-1454NN AT PSU

Posted on 2023-03-23, 12:26

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by anetanel

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

While I'm waiting for the diodes, I poked around and found something odd. The ceramic resistor (?) near the large caps is shorted. The mark on the board is THR, so I thought it should be a thermistor, but goggling the part number (W3R22J) brings up results for a resistors with 0.22 ohm resistance... …

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