Re: intel VS440FX (Venus) - Socket 8 motherboard - need help

Posted on 2022-04-04, 21:01

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Not much help, but from the photo: L8L1 : HM00-94885A This'll be an inductor of some sort, but can't find a datasheet for it, so it'll need to measured or guessed FB8L1 : unmarked as far as I can see, a ferrite bead of some value, but again will need to be measured or guessed C9L1 : ceramic …

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Re: md-4duv-ver 2.1 Motherboard, Need to track down a Manual

Posted on 2022-04-03, 18:50

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

maybe this is the board: https://www.ultimateretro.net/en/motherboards/640#downloads (listing says MB-4DUVC, but the first photo there is labelled MD-4DUV-VER: 2.1. Looks like most jumper settings are shown on the silkscreen).

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Re: Slot 1 voltage support for 1.65v with cherry cs5165

Posted on 2022-04-02, 08:35

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks like the clock gen will do other frequencies, but only if it's set via software (maybe setfsb or softfsb? Looks like they can be used on 440BX chipsets). But it might need a bit of hacking to make it work, since I think R225 and R226 will need to be fitted to connect the clock gen chip to the …

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Re: Slot 1 voltage support for 1.65v with cherry cs5165

Posted on 2022-04-01, 20:00

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

can you post a photo of the 28 pin chip near the CMOS battery and the 14.318 crystal, or just give the part number? It's possible it has some undocumented frequency outputs.

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Re: Slot 1 voltage support for 1.65v with cherry cs5165

Posted on 2022-04-01, 08:16

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

According to page 6 of this: https://www.onsemi.com/pdf/datasheet/cs5165-d.pdf then the CS5165 does support the full range, including 1.65V.

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Re: I'm looking for a mouse that meets some specific criteria...

Posted on 2022-03-30, 17:50

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There were some Microsoft wireless+optical mice that were dual USB and PS/2, with a passive adapter to convert the USB plug to PS/2. No idea if they worked well with KVMs. e.g. http://www.telecommander.com/pics/links/mice/ … relessoptrt.htm

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Re: Does anyone recognize this flat panel connector?

Posted on 2022-03-28, 21:12

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Boo, they've used internal layers for routeing. It looks like the connector pinout I found is close, but not the same. The DVI pairs are all the right number of pins away from each other, but not in the right order. Have you got a multimeter you can do a bit of tracing with? In particular, I think …

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Re: Does anyone recognize this flat panel connector?

Posted on 2022-03-28, 10:12

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I may be misreading it, but I think the SiI140 output is DVI compliant. I found a partial datasheet for it, whilst cursing whoever thought mixing i, I and 1 in a part number was a good idea. At least they didn't use l. [that's SiI140 with a lower case i, upper case i and number 1] Would need a …

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Re: One of my computers caught fire today

Posted on 2022-03-26, 18:38

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'd guess that the dead FET was on the high side of the power supply and failed open. The output voltage would then be too high, so the controller would have the low side FETs on all the time, so a lot of current would flow through the failed FET, then to ground through all the low side FETs. What I …

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Re: Does anyone recognize this flat panel connector?

Posted on 2022-03-26, 13:53

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just found a possible pinout: https://www.manualslib.com/manual/814614/Wincor-Nixdorf-Ba73a.html?page=51#manual It's possible that RX[0,1,2,C][N,P] pins are the 3 pairs and clock for a single link DVI-D/HDMI. Then there are some +5V and +12V connections (monitor powered over the connector maybe?), …

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Re: Does anyone recognize this flat panel connector?

Posted on 2022-03-26, 11:27

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Bringing up the level on the photo of the connectors then it looks like a dsub-9. Tiny bit more information here: https://www.manualslib.com/manual/889278/Winc … -2.html?page=29

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Re: Does anyone recognize this flat panel connector?

Posted on 2022-03-26, 08:21

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks like 40 pin (20 top and bottom). Thought it might be the SGI flat panel connector, but that's 36 pin. What card is it on?

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Re: IBM 5150 Mainboard repair

Posted on 2022-03-24, 17:41

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I don't know much about the analogue side of clocks, but my guess is that the capacitor isn't going to move the frequency very far from the crystal 14.318. I think it's more for making small adjustments. I'd guess that small values will slightly increase the frequency, but go too small and it'll …

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Re: IBM 5150 Mainboard repair

Posted on 2022-03-24, 12:08

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks like it acts as a calibration for all the clocks: http://www.minuszerodegrees.net/5150_5160/mis … _generation.jpg From the schematic you can see it's in series with the main 14.318 crystal: Filename 5150_Clock.jpg File size 53.73 KiB Views 733 views So if it's failed open then the clock won't …

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Re: Possible to run K6-3 with vcore of 2.8v?

Posted on 2022-03-21, 18:55

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks like the SC1150 chip has 4 inputs to control the output voltage, and JP3 connects to VID2,1,0 (pins 14,15,16). Looks like those inputs are normally pulled high and when a jumper is fitted then it pulls the input low. VID3 (pin 13) must be is probably always pulled low. From the datasheet that …

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Re: Need help, De-Lidded k6 cpu configurations

Posted on 2022-03-17, 13:19

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

On the K6-iii, might be worth looking at the pads in the top corners: k6iii_possibleConfig.jpg They're marked slightly differently, in a similar way to the k6-2+. My guess is that the pads marks with a single tiny dot are possibly Vcore, unmarked are Gnd, 2 tiny dots might be Vio (but they never …

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Re: Flytech Carry I, is it worth saving?

Posted on 2022-03-15, 13:46

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Sticker on the back seems to say it's an engineering sample of the FT-8111, so maybe a development of the FT-8100 in this advert from 1990: http://vintagescan.blogspot.com/2015/12/flytech-carry-i-1990.html The 8200 is listed as having 2 serial ports, and this one only has 1, so it's probably based …

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Re: Thoughts on k6-233 on socket 5

Posted on 2022-03-14, 22:07

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I did lash up a possible design for a carrier board for a Murata switch mode adjustable supply module that may (or may not) fit in the space available (may need a small motherboard mod to supply a Ground level to the module). Don't think it's actually been tested though: https://www.vogons.org/ …

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Re: Asus A7V133-C probably got fried by a faulty GeForce 6200

Posted on 2022-03-11, 12:25

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That sounds odd, don't hard drives spin up as soon as 12V is applied? Are the cooling fans on motherboard headers, or plugged directly to the PSU? Can you measure what the 12V line is on a molex connector? A PSU doesn't just output 12V when plugged in or switched on by its own; it requires a …

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Re: Need help decoding a datasheet

Posted on 2022-03-09, 22:53

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Can't tell from the datasheet, but maybe the frequency set by the power on latched inputs isn't shown in bits 7:4,2. So when bit 3 is set to '0' then the values you read for 7:4,2 don't tell you what the current frequency is. They just tell you what the frequency will be if you set bit 3 to '1'.

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