Re: Help me fix a Highscreen trackball

Posted on 2025-06-12, 19:04

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Can you tell if any of the switches send data? I think R4 is to do with power to the rotary encoder LEDs, but I don't think that should affect the switches. I think the wire colours are Blue is Ground, Orange is -ve, Green in +ve, Brown is Tx, White looks like it's something to do with selecting MS …

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Re: Help me fix a Highscreen trackball

Posted on 2025-06-04, 20:45

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Can you tell if any of the switches send data? I think R4 is to do with power to the rotary encoder LEDs, but I don't think that should affect the switches. I think the wire colours are Blue is Ground, Orange is -ve, Green in +ve, Brown is Tx, White looks like it's something to do with selecting MS …

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Re: Mainboard won't soft power on (GA-586STX)

Posted on 2025-05-06, 14:11

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

5VSB looks like a very low resistance (4.3mohm).

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Re: Solved: USB front header of IN530

Posted on 2024-06-28, 16:21

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Glad you got it working. I had a MS6147 from a Packard Bell (might be the same as weedeewee's) with a similar setup: 6 pin header to switch one of the USB ports from the back panel to a 10 pin internal header. https://theretroweb.com/motherboards/s/msi-ms-6147-bx7#docs Looks like the pinout was …

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Re: Bought these (retro) hardware today

Posted on 2024-04-19, 15:21

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks like CT940 goes between -12V and +5V analog supplies (based on the copper areas on the back), so seems unlikely there should be a short between those two. Might want to try just removing it and making sure there isn't a short between the two holes. Only thing I can think immediately think …

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Re: Puzzling Memtest86 error

Posted on 2024-04-17, 20:06

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Probably no the same thing, but I had a problem that drove me mad trying to track down, with sticks working fine on their own, but not together. Changed caps, rejigged the RAM power supply voltage to bypass the FET that switched between normal and standby, changed power supplies, carried on like …

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Re: Asus keyboard not work

Posted on 2024-04-16, 13:12

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Pictures are fine, and that looks like it. The previous thread said it was marked C151, which the component marking it is on yours. The silkscreen marking is CN1. If there's not enough space to put the silkscreen right next to a bunch of components then they will put all the silkscreen marks nearby, …

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Re: Asus keyboard not work

Posted on 2024-04-16, 12:00

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Assuming it is the same fault then a picture of the whole board doesn't really help as other components get in the way (particularly those big capacitors) so we can't see the component around the PS/2 ports. It might help if you could take a picture of the area around the PS/2, good enough to read …

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Re: Obscure turbo LED display layout.

Posted on 2024-04-16, 11:44

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Have any of you seen this model of display before or any documentation about it? Can't help directly, but looking at what can be seen of the tracks then I think it's going to be a switch controlled version with no input from a motherboard LED header, and no output to a case LED either. So it needs …

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Re: 486 LED Display - Determine wire location without PCB labels

Posted on 2024-04-16, 10:26

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hey, cool. It'll be a bit of a bother, but could you take a couple of photos showing the connections so it's here as a reference. Also, it looks like I might have gotten the G/+5 the wrong way around as you've got it 5V G and I had it G 5V. Still, glad it's working.

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Re: Changing I/O card's Parallel Port's Address

Posted on 2024-04-13, 10:45

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This looks like it might the same card: https://stason.org/TULARC/pc/hard-disk-floppy-controllers/U-Z/UNIDENTIFIED-Two-IDE-AT-interface-drives-SUN-5241.html That says a jumper on JP6 A (from the silkscreen that's pins 1&6) should make it LPT1. Unfortunately, it's not that one. Putting a jumper on …

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Re: Converted registered SDRAM

Posted on 2024-04-12, 17:17

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks like the PCB is the same as mine, so there's the option of moving the current 10k pull-up resistor that's on the back, by soldering on to the vias. Either above pins 147&148, or just to the side of the original pads. Easy enough to undo, leaves the inverter in place, should look reasonably …

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Re: Changing I/O card's Parallel Port's Address

Posted on 2024-04-12, 16:39

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This looks like it might the same card: https://stason.org/TULARC/pc/hard-disk-floppy … s-SUN-5241.html That says a jumper on JP6 A (from the silkscreen that's pins 1&6) should make it LPT1.

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Re: 486 LED Display - Determine wire location without PCB labels

Posted on 2024-04-11, 11:43

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok, so you can see the usual T arrangement across the top and bottom. Using your colours then Yellow is the always lit position, Red is Turbo On and Purple is Turbo Off (on/off might be the other way around). The 150 ohm resistor in the top right (you've marked one side as brown) is probably for the …

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Re: Converted registered SDRAM

Posted on 2024-04-11, 08:29

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That sounds right. Rotating both 0-ohm resistors seems to pick 3 different settings, I think for clock phase, one of which will give you the best timings. Clock signal comes in on one link, through a via, I think to a loop on an internal layer, through a via to the other side of the stick, through …

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Re: 486 LED Display - Determine wire location without PCB labels

Posted on 2024-04-10, 17:13

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There's that separate T in the top right, which I'd guess is for the hundreds. Good luck with it.

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Re: Converted registered SDRAM

Posted on 2024-04-10, 17:01

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Never bypass pullups/pulldowns like that if what was done is what I think was done. There is an example of someone doing this in the tillamook thread, I had to fix the procedure for them lol. Anyway, following their method it sometimes blows up a resistor. Ah, I'd wondered if there might be a …

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Re: 486 LED Display - Determine wire location without PCB labels

Posted on 2024-04-10, 16:04

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok, so I can't see enough to be sure of the wiring, but my guess for the connections is in the picture below. GND and +5V go to the top row, M+ and M- go to the motherboard turbo LED header, then T+ and T- can go to a case LED turbo indicator. The GND and +5V are based on the +5V pin going to pin 1 …

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Re: Converted registered SDRAM

Posted on 2024-04-09, 15:31

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think the T structure acts as a sort of phase control for the clock. On mine there was a matching structure on the front and back, both with a 0 ohm link between the centre pad and one of the three ends. As long as the link was in the same position on both sides then the memory worked, but one …

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Re: 486 LED Display - Determine wire location without PCB labels

Posted on 2024-04-09, 14:44

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks like it might be sort of similar to this one: https://www.minuszerodegrees.net/led_speed_display/LED%20display%20-%20SD-402.jpg Can you post pictures of the front and back with the cable removed, and make a note of any markings on the transistor cases? Might be possible to work out the pinout …

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