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Re: Test and troubleshoot PC@LIVE motherboards

Posted on 2021-06-14, 19:50

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Today I made further progress, in the configuration of the PC, I added the ISA sound card (SB16 Value CT2770), but I had to move the controller to the ISA4 slot, because in the ISA2 slot there is a crystal that prevents correct insertion, that is the ISA card touches the quartz and remains raised. I …

Re: I recently found this hardware, AKA the Dumpster find thread.

Posted on 2021-06-14, 19:31

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

K7T Turbo - too late to recap? Excellent condition minus the caps... IMG_3194[5596].jpg I have an identical board with the same problems, electrolytic capacitors to replace, I've been saving it for years, I still have to order spare parts, unfortunately I don't have capacitors of the same capacity …

Re: Biostar mb-8500tur and right jumpers for MMX 200

Posted on 2021-06-13, 19:37

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

A ok then does not support the P.MMX or yes? If it doesn't support it, you need to figure out how to make the mod to power it properly (add dual voltage). The images I asked for were used to understand if it was a model born for normal Pentium, many i430VX can support MMX only if dual voltage is …

Re: What retro activity did you get up to today?

Posted on 2021-06-13, 19:20

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Fixed 386DX motherboard, fixed keyboard controller problem. After various assumptions about broken tracks or shorted or broken components, I simply removed the keyboard controller chip and cleaned the PINs with very fine glass paper, they were visually like new when finished. Starting the PC you …

Re: Biostar mb-8500tur and right jumpers for MMX 200

Posted on 2021-06-13, 19:04

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

A ok then does not support the P.MMX or yes? If it doesn't support it, you need to figure out how to make the mod to power it properly (add dual voltage). The images I asked for were used to understand if it was a model born for normal Pentium, many i430VX can support MMX only if dual voltage is …

Re: Test and troubleshoot PC@LIVE motherboards

Posted on 2021-06-13, 18:48

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Update on 386 motherboard: Today I solved, the problem as I thought was a bad contact. What looked like a broken track was perfect, there was dirt on it and it looked broken. Before reinserting the keyboard controller chip, I passed the PINs on a fine sandpaper, after the operation the PINs were …

Re: Biostar mb-8500tur and right jumpers for MMX 200

Posted on 2021-06-12, 22:45

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, I've seen the pictures but from what I see I can't tell if it's a card that supports the Pentium MMX. The CPU appears to be a 200MMX, excluding that it is not an original, the only reason it does not go to 200 is that maybe you set the jumpers wrong. So I would say if you can put an image of the …

Re: Test and troubleshoot PC@LIVE motherboards

Posted on 2021-06-12, 22:15

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

A little while ago I removed the controller chip, as I imagined there is no other chip underneath, and I do not detect any oxidation. Once the chip has been removed, a screen-printed message appears (visible in the photo), 8742 Keyboard controller, it also says J08-4017C, but I don't know what it …

Re: Test and troubleshoot PC@LIVE motherboards

Posted on 2021-06-12, 21:51

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

In recent days I have been looking for info on the keyboard controller, in this case it is the LANCE CORP chip. LT38C41, from what I found there are no compatible alternatives in case of chip failure, you have to use an identical chip, I don't know if another chip could be compatible, but I only …

Test and troubleshoot PC@LIVE motherboards

Posted on 2021-06-08, 19:27

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

TK-82C390A-4N-D11SE 386DX motherboard test, 128KB L2 cache, UMC chipset, 4MB RAM 30PIN, AMI BIOS. In recent days I have fixed the two broken tracks of the socket for the keyboard plug. The work was not complicated, the tracks are large, then I changed the socket for the keyboard with another ( …

Re: Identify motherboard Slot 1 SIS chipset

Posted on 2021-06-02, 18:58

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I come back to this thread because I have some news on how the + 3.3V of the power supply is connected to the motherboard. Looking for a connector for the AT keyboard, I found a PCCHIPS AT motherboard (BXCEL-ALI chipset), the + 3.3V PINs of the motherboard are connected together, after a track it …

Re: I recently found this hardware, AKA the Dumpster find thread.

Posted on 2021-06-02, 18:49

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have selected various ISA cards for the motherboard with 386DX-40 (see photo), a 128MB SanDisk IDE-CF and CompactFlash adapter, a 16bit ISA controller with Acer M5105 chip and parallel and game serial ports, as sound card I have to choose one between AZTECH and Creativa SB16 Value (CT2770), as …

Re: Bought these (retro) hardware today

Posted on 2021-05-31, 20:29

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

... I have done it in the past with other cards, the alternative you suggest of the external battery, instead requires the setting of the jumpers, theoretically it is simple to do, unfortunately I do not have the manual and therefore I do not know how and what are the jumpers to set. I'm 99% sure …

Re: Bought these (retro) hardware today

Posted on 2021-05-30, 20:39

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

... the vendor says the card was working but hasn't started it for a while. "for a while"? Probably more like a decade. If this board works with all the corrosion around the battery I'll eat my hat. Get that battery of there asap. Then soak the whole area in white vinegar for a few minutes, then …

Re: Bought these (retro) hardware today

Posted on 2021-05-30, 20:24

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

[...] Ok thanks for the info, could you show me something like that, so I can get a better idea. UTP to BNC transceiver (relatively rare): trendnet_BNC_UTP.jpg UTP to AUI transceiver (relatively common): Allied_UTP_AUI.jpg OK thank you very much. I will try to find one, it could be very useful …

Re: I recently found this hardware, AKA the Dumpster find thread.

Posted on 2021-05-30, 20:18

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

chrismeyer6 wrote on 2021-05-30, 19:55: The 3com card you have the picture of had a RJ45 ,AUI, and BNC connector. It's ready to go for a standard Ethernet setup. OK thank you very much. Obviously I will try in the PC as soon as I can test it and if everything is ok it should be fine.

Re: What retro activity did you get up to today?

Posted on 2021-05-30, 20:04

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Unfortunately, having only ISA slots it is not possible to add other useful things such as USB, perhaps if you want you could solve the problem of data exchange via LAN or with LAPLINK (and special cable). https://www.aliexpress.com/i/33037705524.html Apparently comes with the DOS driver. Shipping …

Re: I recently found this hardware, AKA the Dumpster find thread.

Posted on 2021-05-30, 19:49

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'd almost guarantee that the 3Com nic will work with Did/windows 3.1/3.11 OK thanks. Of course I could use WFW3.11 which should be suitable for the purpose. Unfortunately it is the only one with RJ connector that I have available, the others have only RG connectors (see photo), even if they are …

Re: What retro activity did you get up to today?

Posted on 2021-05-30, 19:16

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here is the final result after cleaning.

Re: What retro activity did you get up to today?

Posted on 2021-05-30, 19:14

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Today I dedicated some time to the MB 386DX, I selected the cards to be used, among various audio video controllers LAN modem, all of course ISA. Unfortunately, having only ISA slots it is not possible to add other useful things such as USB, perhaps if you want you could solve the problem of data …

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