Re: Help with Octek Fox M 286 (broken chip)

Posted on 2018-02-07, 20:50

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks for your effort! I played around with the above code but couldn't get it to compile. WinCupl gives me 20 warnings (or three fatal errors if i try device dependent compile; btw, i don't know what should i choose). The program seems rather unfriendly towards noobs like me and doesn't specify …

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Re: Help with Octek Fox M 286 (broken chip)

Posted on 2018-02-06, 23:01

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'd suggest you to use Atmel's freeware WinCUPL to create equation project and generate jedec file. Played a little with the program, it's way more complicated than i anticipated. Anyone that has experience with this stuff and is willing to compile the jedec file for me will be rewarded with my …

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Re: Anyone got a ZIDA 4DPS Tomatoboard ? Need help

Posted on 2018-02-06, 22:56

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

1N4148 or any small signal diode should work.

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Re: Help with Octek Fox M 286 (broken chip)

Posted on 2018-02-06, 01:57

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks like i found the datahseet/application notes of the Headland chipset. At the end, a schematic of a demo 286 board along with the PAL equations! I've traced most of the pins of the broken PAL and they coincide with the schematic. So i'm pretty sure that my board will happily boot again. I just …

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Re: Help with 286 motherboard (DTK PTM-1030)

Posted on 2018-01-22, 23:46

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Tomorrow i'll do some more comparisons with the boards powered on, maybe i'll find a stuck line or something like that. Had no time for that, and besides i think it might be futile without an oscilloscope or logic analyzer (only have a couple of multimeters). For a quick and dirty test i replaced …

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Re: Identifying external battery connector on a 286 board

Posted on 2018-01-22, 17:56

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I would say that pin 1 (rectangular instead of circular pad on the bottom of the board; the one closer to the diode D5) is the positive, as it seems connected to anode of D5. Anyway, on most (if not all) boards the ext.bat. header has a diode in series, so connecting the battery backwards would …

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Re: Help with 286 motherboard (DTK PTM-1030)

Posted on 2018-01-22, 00:05

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The installed ram is 1MB (and that's the maximum, according to stason.org). KBC pin 22 goes to pin 11 of the VL82C102 memory controller (A20 Gate - Used to select the proper value for address bit 20). I spent my evening tracing all the pins from the KBC and comparing with a working board with the …

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Re: Help with 286 motherboard (DTK PTM-1030)

Posted on 2018-01-20, 22:53

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

As Auzner said. I actually used old-fashioned rosin flux, which i melted with the soldering iron on minimum heat and deposed all over the affected area, then at around 350 degrees C i have tinned the tracks. I use a DYI (not buit by me but bought from someone that builds them) soldering station for …

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Re: Help with 286 motherboard (DTK PTM-1030)

Posted on 2018-01-20, 12:37

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thank you for your input! @ Auzner, derSammler - i will try fitting a battery, hopefully later today if i have some spare time, and i will post here the results. @ Predator99 - at first i used vinegar to neutralize the spill, then a local isopropyl bath to remove the vinegar. The board was very …

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Help with 286 motherboard (DTK PTM-1030)

Posted on 2018-01-20, 02:23

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Earlier this month i got this board as part of a lot of 5 defective boards. I've managed to repair 4 of them until now but this one proves to be kind of stubborn. After neutralising and cleaning the corrosion from the battery i powered up the board, it seemed to work just fine but didn't respond to …

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Re: Help with Octek Fox M 286 (broken chip)

Posted on 2018-01-17, 00:01

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Still searching, PM sent. Thanks.

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DataExpert EXP8449 ver. 1.3, BIOS needed

Posted on 2018-01-04, 01:03

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello everyone and Happy New Year! Well, the title says it all. In trying to get this board to POST i got myself a TL866CS programmer that arrived today. I had already searched the net and found two (different!) bios images for this board, and upon reading my EPROM chip with the TL866 turns out that …

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Re: LS486E C2 not booting with 3V CPUs

Posted on 2017-12-19, 23:57

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Can you post a close-up photo of the VRM area of your board? I have one LS486E board, and had some problems with the VRM at first. There were signs that the transistor (TIP127A) ran very hot (oxidized, broken solder joints), and since the terminals were extremely short and i couldn't re-solder them …

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Re: Help identify board, single/dual voltage issue

Posted on 2017-12-12, 12:02

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks. The bios id string is identical for my board, however the layout and jumpers are quite different from what's in that manual...

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Help identify board, single/dual voltage issue

Posted on 2017-12-11, 21:46

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello folks, Does anyone have any info about the board below? It is marked as "SM-P5TX3", on elhvb they describe it as " KM-T5-T3 aka Informtech 533T-AT aka Mentor BN533T aka BCM SQ572 aka SanLi/Superpower SM-P5TX3 " but that board looks quite different from mine, including jumper settings. And that …

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Re: Help with Octek Fox M 286 (broken chip)

Posted on 2017-12-06, 22:14

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks everyone for your answers and advices. Unfortunately, finding someone willing to risk his board to send me (or to someone else) the chip for copying seems like an impossible task. (more likely to someone else, as I know nothing about the devices used to read and program these things). Also, …

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Re: Bought these (retro) hardware today

Posted on 2017-12-05, 22:33

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by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Cyrix200+ wrote: I'm curious. How do you know that chip is broken? 😀 Filename broken chip.jpg File size 278.99 KiB Views 645 views 😁

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Help with Octek Fox M 286 (broken chip)

Posted on 2017-12-04, 23:52

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello, Bought this board today, seemed to be in perfect shape for something built 26 years ago. But upon closer inspection I found one of the chips to be broken (split in two, as if hit with great force): it's the one labeled PAL 089-001. Removed the label, the chip is a PAL16L8BCN, which according …

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Re: Bought these (retro) hardware today

Posted on 2017-12-04, 23:17

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Bought these four boards today, I now have not one but two VLB boards (not yet a VLB videocard, but I'm planning to). The 486 boards (TK 8498F/GP 4N D24 and MB-495SX Rev1.1 / OPTi495SX) are in good working order, but the 386 one (can anyone help me identify it?) has been quite corroded because of …

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Re: Jackpot - Was given an entire Store Inventory for FREE

Posted on 2017-11-22, 23:19

by

by quicknick

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Wow, this brings back some memories! The somewhat incomplete AT case in the last picture, I had that in my first PC back in 1996*. Can you please post a close-up of it? Thanks. *Actually my first was a Russian XT-clone, two years earlier 😀

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