Re: Converted registered SDRAM

Posted on Yesterday, 16:27

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

But what about the 5 leg inverter thing on the other side, should i leave it on the pcb or should i remove the inverter? That stays. The 10k resistor is on the input pin of the inverter, normally pulling it high, unless the input is over-ridden by a signal coming in on pin 147 from the motherboard. …

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Re: Converted registered SDRAM

Posted on Yesterday, 08:33

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My guess is that the side of the 10k resistor (marked 103) you've marked with the arrow will connect to pin 147 of the edge connector. The other side of the resistor probably connects to Vcc. That would mean that if pin 147 isn't driven by the motherboard then the middle pin of the 5 pin chip (input …

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Re: Dying sound card?

Posted on 2022-08-04, 16:10

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Not sure, but I think on that card FM synth is handled by an external chip (internet seems to think a DXP44Q). If that's right, then it might be worth pressing on that chip whilst running the Duke3D sound test, in case one of the solder joints has failed. A photo of the card might help.

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Re: ASUS P5A jumper setting for 3.3v VIO

Posted on 2022-07-24, 07:24

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

For 5.5x then try BF2=2-3, BF1&0=1-2. It looks like the BF pins are all wired up, so I think that should set it to '011' which is the 5.5x given in the k6-2 datasheet.

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Re: CRT and wrong colours

Posted on 2022-07-20, 17:12

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If I'm reading right, then I think it's a bit odd that the colours are ok in Windows but not the game. Or if you correct the monitor for the game then it's wrong in Windows. Maybe there's some colour change at different resolution/frequency?

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Re: ASUS TX97-XE (V3.x) and AMD K6-2/366AFR 366MHz

Posted on 2022-07-20, 13:58

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If think the FS jumpers for 66MHz are on the silkscreen by the jumpers, FS0&2 to 2-3 and FS1 to 1-2. Couple of lists I've looked at have the 366MHz as 66*5.5. You can try at 83MHz FSB, but you'll probably want to drop the BF multiplier down. The 4x multiplier (83*4=332MHz) should be BF2&0 to 2-3 and …

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Re: ASUS TX97-XE (V3.x) and AMD K6-2/366AFR 366MHz

Posted on 2022-07-20, 11:46

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Assuming that the BF2 jumper is connected to the BF2 pin on the CPU, then it looks like on the BF jumpers then 1-2 pulls it high and 2-3 pulls it low. I think the 366 is got from 66MHz * 5.5, and the 5.5 multiplier is BF2..0: = 011. So BF2 on 2-3 and BF1&0 on 1-2. Then set the FS jumpers to 66MHz. …

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Re: #freshmeatrecovery - Abit VH-20

Posted on 2022-07-06, 21:17

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah, it's odd. In your first table then SW4 doesn't seem to do anything. But then with the P3 it does, and the 124MHz fits with the datasheet. May just need a bit more experimenting.

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Re: #freshmeatrecovery - Abit VH-20

Posted on 2022-07-06, 19:12

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Today I recheck it with P3 1GHz (133x7.5) and found All off - is a Auto mode SW1 - on, SW2-SW4 - off - is 124MHz SW1 - on, SW2-3 - off, SW4 - on - don’t start??? Ate there any ideas? Maybe SW4 is connected then, to the FS3 in that datasheet (page 12). In that table a '0' is 'on' and '1' is 'off', …

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Re: #freshmeatrecovery - Abit VH-20

Posted on 2022-07-06, 14:22

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Clock generator looks like a PLL202-11, datasheet here: http://www.abcelectronique.com/composants/telechargement_datasheet.php?id=771029&part-number=PLL202-11D Seems to pretty much match the table you worked out: SW3 SW2 SW1 - CPU PCI on on on - 80 40.0 on on off - 75 37.5 on off on - 83.3 41.7 on …

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Re: MFM drive caps help needed

Posted on 2022-06-30, 13:54

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Bit late, but found this: https://datasheets.kyocera-avx.com/AVX-MA-Series.pdf Format matches, so assuming (bit of a leap here) Kyocera haven't changed their markings much, then: A6A 101 JCC 614 - AVX, (unsure of voltage rating, 600V?), C0G dialectric, 100pF, +/-5%, lot code CC, 614 date code (1986? …

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Re: Two defective Roland MT-32 units?

Posted on 2022-06-27, 21:00

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Probably worth trying Pentiumspeed's suggestion of repairing the pot, I've had that work before. I had a quick look on Mouser and it looks like there are a few 50k pots: https://www.mouser.co.uk/c/passive-components/potentiometers-trimmers-rheostats/?number%20of%20gangs=1%20Gang&product%20type= …

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Re: A-Trend ATC-1442G missing capacitors!!!

Posted on 2022-06-06, 16:54

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Wouldn't the usual crystal be 14.318? The SC462 datasheet is here: https://www.datasheetarchive.com/pdf/download … am%2520circuits It's only 3% difference, so I don't think it'll cause any problems either way.

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Re: Bought these (retro) hardware today

Posted on 2022-05-27, 08:20

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

cyclone3d wrote on 2022-05-26, 23:59: Feel free to guess the brand/model 😀 Is it cheating to just look up the MAC address? Power in port looks similar to theirs.

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Re: Help identify this graphics card

Posted on 2022-05-26, 14:56

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

In case there's no one that has the card then if I squint a bit I can almost convince myself that it's an LP2951 adjustable regulator, possibly from Alpha semiconductor (there are lots of manufacturers of LP2951s). If you post a photo showing the area (good enough to see the resistor values) then it …

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Re: Intel D815EEA2U

Posted on 2022-05-25, 20:07

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is this it: https://www.ultimateretro.net/en/motherboards/8309#downloads

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Re: Help Setting MHz LED Display

Posted on 2022-05-22, 10:45

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This isn't the same, but might be similar: http://minuszerodegrees.net/led_speed_display/LED%20display%20-%20SD-402.jpg When it shows 16, is the '1' the two left hand, or the two right hand vertical bars? Assuming the normal 'T' shaped layout of the pins along the top and bottom (although starting …

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Re: How do I turn these on?

Posted on 2022-05-21, 19:53

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks like an iei Rocky 3786? If so, there's a manual here: https://www.manualslib.com/download/895286/Ie … cky-3786ev.html Page 33 says CN5 (up near the VGA port) is a 2 pin ATX power switch connection.

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Re: Intel AA-654850-206 Advanced/ML Marl motherboard lost VRM

Posted on 2022-05-19, 13:58

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

With a decent photo of the front and back of the board in the area around the regulator then it might be possible to work out how it's wired up, and from that have a guess at what the part ought to be. Only worth trying that if no one else can find out what the part really is.

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Re: Serial mouse worked only for a day on DOS machine

Posted on 2022-05-17, 13:43

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

In the photo of the board the if I'm counting correctly it looks like it's JP5 set to 2-3, with JP6 set to 1-2? If that settings sheet is correct then JP5 on 2-3 disables the external serial port. [I'm guessing those resistors are pull ups for the game port switches. If you're not using the gameport …

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