Strange 386 motherboard

Discussion about old PC hardware.

Re: Strange 386 motherboard

Postby eisapc » 2019-2-11 @ 14:02

n0m4d wrote:The memory expansion fits perfect to my motherboard, sadly it not working. Without ram motherboard can't wake up, its beeping, without ram, but with memory expansion nothing, MB can't boot, with ram and expansion its starting but its freezing during memory count.

It may need the correct switch or jumper settings to make use of the memory board? Whats making the board rare is more the TI chipset and these strange square cache chips than the cache controller. Never seen both before. These proprietary memory slots were quite common on early 386 boards.
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Re: Strange 386 motherboard

Postby n0m4d » 2019-2-11 @ 15:51

Nothing, still the same
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Re: Strange 386 motherboard

Postby Predator99 » 2019-2-11 @ 16:55

There are no jumpers on the card itself?

I would try to remove the whole memory from the memory card. Does it boot with an empty expansion card?

If yes, populate only one bank at the end and try this program/procedure:
viewtopic.php?f=46&t=62298
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Re: Strange 386 motherboard

Postby n0m4d » 2019-2-11 @ 17:16

ok i will check it, but I'm not sure if this manual I find its from my motherboard, because 3 jumpers are in different places
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Re: Strange 386 motherboard

Postby n0m4d » 2019-2-14 @ 23:30

which one is a bios chip? I want to sent it to copy my bios but I'm not sure which one
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Re: Strange 386 motherboard

Postby quicknick » 2019-2-14 @ 23:50

Both 27C256 chips are the BIOS (high/low or even/odd arangement).
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Re: Strange 386 motherboard

Postby n0m4d » 2019-2-15 @ 00:24

And chip on left side? Its also bios?
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Re: Strange 386 motherboard

Postby tayyare » 2019-2-15 @ 06:08

n0m4d wrote:And chip on left side? Its also bios?


It's a keyboard controller chip.

https://en.wikipedia.org/wiki/Keyboard_controller_(computing)
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Re: Strange 386 motherboard

Postby root42 » 2019-2-15 @ 08:32

tayyare wrote:
n0m4d wrote:And chip on left side? Its also bios?


It's a keyboard controller chip.

https://en.wikipedia.org/wiki/Keyboard_controller_(computing)


Which also contains a bit of code, since it's a microcontroller. See here:

https://en.m.wikipedia.org/wiki/Intel_MCS-48

That's probably why it has a copyright sticker by Phoenix on it.
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