Re: Bringing to life a Gateway 2000 P5-120

Posted on 2021-05-25, 19:05

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks very like a Dell motherboard I've got. You want to look at the silkscreen between the cache and RAM slots for the 'C' jumper setting for the clock frequency. Then the silkscreen just to the right of the jumpers for the 'D' jumper settings for the CPU multiplier. Max frequency on my board is …

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Re: Identify motherboard Slot 1 SIS chipset

Posted on 2021-05-24, 21:49

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes ok thanks. You can do these checks tomorrow, and in fact it could be as you suggest. Because it is actually strange that there is no voltage, those inductors L1 and L2 are placed between the ISA and PCI slots, near the CD-IN audio connectors. Ah, I can't count. I meant the 6 inductors by the …

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Re: Identify motherboard Slot 1 SIS chipset

Posted on 2021-05-24, 21:06

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok I hope those photos can be useful, for those of more than 5MB I'll try to reduce them, but I don't know what the result will be. For the fuses I checked those three marked with F1 F3 and F4, these are all intact (perfect), I don't think there is an F2, for the moment I don't see it, if I find it …

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Re: MFM 5.25 floppy with 5ali61

Posted on 2021-05-24, 18:46

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Current limited PSU..? I don't own one. But I guess I could measure the current with a multimeter in series? Can also maybe test it outdoors and outside the computer case. :-) Not the whole PSU, just what each pin on a chip can handle. Probably a good idea to follow Deunan's advice on the post at …

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Re: MFM 5.25 floppy with 5ali61

Posted on 2021-05-24, 17:07

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

One thing I definitely don't understand are the diagrams on sheet 15/19 (page 8 in your scan). Don't know why there's both a 220 ohm pull up and a 330 ohm pull down. This may be some detail of the 74LS that I'm missing. Also, there mention of termination resistors on sheet 7/19, which I'm not sure …

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Re: MFM 5.25 floppy with 5ali61

Posted on 2021-05-24, 13:22

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I post the PDF that I managed to make last night but for some reason the pages are in the wrong order. Also some are missing but it is because they were simply were not in the package. Maybe they were full of (very bad) pictures and when they were printed 40 years ago someone probably wanted to …

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Re: MFM 5.25 floppy with 5ali61

Posted on 2021-05-24, 10:29

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah, looks like the only that's a real issue for connecting to a PC is the Ready signal. Probably a few ways to connect it up, but I think one way is to cut wire 6 and 34 in the cable, then join wire 34 from the motherboard to wire 6 from the drive. That leaves drive input 34 DS4 not connected, but …

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Re: Bought these (retro) hardware today

Posted on 2021-05-24, 08:48

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

awesome. I still use my Sw3DPro in Windows 10 I thought Sidewinder joysticks were a no go in Windows 10? I have a Precision 2 still NIB.. There's an Atmel based project to convert some of the Sidewinders to USB, which worked for my 3D Pro Plus: https://www.descentbb.net/viewtopic.php?f=8&t=15526& …

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Re: MFM 5.25 floppy with 5ali61

Posted on 2021-05-24, 08:34

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There is one jumper, which is not explained in my version of the manual but in an other version. Ah! I saw that and assumed they'd figured out a way to save a chip and put in a wire mod rather than fit the chip. Should have realised that if it was just a wire mod then they wouldn't have fitted the …

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Re: Biostar MB-8433UUD-A and 39SF010A - boot issue (hang during Updating ESCD)

Posted on 2021-05-23, 22:08

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So all in all, you can only use the described method when (a) you have a working setup that you can save to file using UNIFLASH and (b) you're not going to change anything regarding P'n'P. Obviously not very practical... Really putting the 'not' into PnP. Any reason (other than the obvious one of …

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Re: Identify motherboard Slot 1 SIS chipset

Posted on 2021-05-23, 21:44

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Regarding what you have read about the 3.3V of the PCI slot, it could actually be like this, but I wouldn't be sure of this, if it was a 486 PCI maybe it will be like that, being a Slot1 (even if AT), it seems possible that the 3.3V LED should be on and not off. That's true, so maybe it is more …

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Re: MFM 5.25 floppy with 5ali61

Posted on 2021-05-23, 21:08

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So I picked up the drive and it looks to be in almost mint condition except for some bent pins. Lovely. Really like those curvy, organic traces (I guess hand drawn) around the Micropolis logo. There were some questions of Shugart or IBM and one of the pages it actually sais that some connectors are …

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Re: Identify motherboard Slot 1 SIS chipset

Posted on 2021-05-22, 22:14

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

For the PIN A21 I did the verification, and the result is that I did not find any voltage (measured 0.00V). Ok, so definitely no 3.3V on the PCI slots. And yet what should be the 3.3V pins are connected together, so it should have been possible to route 3.3V to them. It might be possible to …

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Re: SMD capacitors on Pentium 233MHz P55C repair

Posted on 2021-05-21, 15:22

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Giving this some more thought, would it be possible to just measure any of those caps in circuit and devide the resulting value by 6 to get a close enough approximation of the individual value? I mean they're all in parallel, right? Not sure. uP datasheets will often specify a few different values …

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Re: SMD capacitors on Pentium 233MHz P55C repair

Posted on 2021-05-21, 13:48

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Of course they are all interconnected (and between supply voltage and ground). These capacitor don't form any specific circuit. They are decoupling the input voltage to minimise noise. It is important they are as close to the hi-freq part inside the CPU as possible to provide low impedance path. …

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Re: SMD capacitors on Pentium 233MHz P55C repair

Posted on 2021-05-21, 10:00

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah, the missing pad could be a thing, If you're lucky, all the caps are on the same connections and you can connect across, although the extra distance and inductance probably mean any capacitor there is effectively disconnected. And it's possible the CPU won't work even if the pad was still there …

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Re: Biostar MB-8433UUD-A and 39SF010A - boot issue (hang during Updating ESCD)

Posted on 2021-05-21, 08:36

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

In my case, I fear it's not as easy as this... I am already using FPM RAM and not EDO. And unfortunately, there is no "Reset Configuration Data" option or anything similar in the BIOS menus that you could use to suppress updating ESCD. I tried another flash chip - an SST PH29EE010-150-3CF - and …

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Re: Shuttle HOT-433 question: huge Ctrl-Alt-Del delay

Posted on 2021-05-20, 22:53

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just a quick follow-up on this one here... I mistakenly put the "turbo" jumper in place, which I thought would turn turbo mode on . But as it turned out, setting this jumper turned turbo mode off :face_palm: So the incredibly easy fix was to remove the turbo jumper and now the board runs like a …

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Re: Identify motherboard Slot 1 SIS chipset

Posted on 2021-05-20, 22:49

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

need to check if there are + 3.3V on the PCI PINs, I will try to do this check, but if I can I will also check other PCI PINs, in particular I had read that on the PIN14 there would be a voltage of + 3.3V, if I find voltage somewhere I report the PINs and the voltages found. Feel free to measure …

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Re: ECS 761GX-M754 no POST

Posted on 2021-05-20, 21:14

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I don't want to throw the motherboard away, I'm sure I'll try to do something with her, but at this moment I lack the necessary knowledge and equipment. Your knowledge and abilities are waaaaay ahead of mine! Don't be too sure about those things, you made some tricky measurements (I struggle to see …

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