VOGONS


First post, by Syntho

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Hey guys, I've got an AMD 25mhz 386 integrated. I see a couple chips on it: an AMI BIOS chip and a keyboard chip. Not sure there are any other chips but will take a closer look. This is what I get when booting:

Top:
ROM BIOS American Megatrends Inc
A423073191

Bottom:
American Megatrends Inc
30-0501-D31169-00001111-05091-ITOPSX-8

I don't know which brand/model this is and I can't find any BIOS info online. Can someone identify this make/model, and most importantly: do you think I should pull those Keyboard and Bios EEPROMs and make copies of them while they still work?

Reply 1 of 7, by fool

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Do you have pictures?

Here is a great thread to record BIOS file if you decide to dump BIOS EPROM.
80386 BIOS image collection

Toshiba T8500 desktop
SAM/CS9233 Wavetable Synthesizer daughterboard
Coming: 40-pin 8MB SIMM kit, CS4232 ISA wavetable sound card

Reply 2 of 7, by Syntho

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There's a sticker on it that says "MSI: 878945"

I'll need to tear it down to take pics.

I have the bios and keyboard chip out. Here's what they say underneath:

S 27C512 -12 FA […]
Show full quote

S 27C512
-12 FA

230C505
9114WG

What kind of chip is this? I'll need to select in my software before copying. I don't see an actual brand on the chip besides that big S, but I do see an option for a generic "27C512", and also another option under the "??? " brand that says "27C512-12.7V".

The keyboard chip is an EEPROM since there is no window. It says:

123101
M5L8042-189P

It has the Mitsubishi logo too so the brand is obvious. I don't see an option for that particular chip in my software though.

Reply 3 of 7, by fool

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Syntho wrote on 2023-02-12, 08:59:
S 27C512 -12 FA […]
Show full quote

S 27C512
-12 FA

230C505
9114WG

What kind of chip is this? I'll need to select in my software before copying. I don't see an actual brand on the chip besides that big S, but I do see an option for a generic "27C512", and also another option under the "??? " brand that says "27C512-12.7V".

That is Philips/Signetics 27C512. "12.7V" stands for programming voltage but you don't need to mind about that.
You can use any 27C512 DIP28 option for reading. To verify dump correctness just take a few dumps and check there are no differences.
http://matthieu.benoit.free.fr/cross/data_she … 27C512-20FA.pdf

The keyboard chip is an EEPROM since there is no window. It says: […]
Show full quote

The keyboard chip is an EEPROM since there is no window. It says:

123101
M5L8042-189P

It has the Mitsubishi logo too so the brand is obvious. I don't see an option for that particular chip in my software though.

That is more like microcontroller with internal ROM that works as keyboard controller. You don't need to dump that one.
Datasheet here https://datasheetspdf.com/pdf-file/1147941/Mi … /M5L8042-XXXP/1

Toshiba T8500 desktop
SAM/CS9233 Wavetable Synthesizer daughterboard
Coming: 40-pin 8MB SIMM kit, CS4232 ISA wavetable sound card

Reply 4 of 7, by Syntho

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Luckily I have a video from months ago of it, and some pics. Here they are:

https://youtu.be/TzQQ2m1nEV8

Attachments

Reply 6 of 7, by Syntho

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fool wrote on 2023-02-12, 09:32:

Very good condition!
Is that Varta battery original?

The battery is no longer with us. R.I.P.. I took these pics months ago to remember how everything was plugged in because I soldered in a new battery. It now has a cellphone battery pack 😀

See the attached for the BIOS. I verified it 3 times. Seems to be good.

Do you think it's possible to come up with an identity for the board?

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  • Filename
    amd38625.BIN.zip
    File size
    38 KiB
    Downloads
    34 downloads
    File license
    Public domain

Reply 7 of 7, by weedeewee

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Any chance of getting photos of ONLY the mainboard and nothing but the mainboard, front & back.

from the bios code, I'm guessing it's an old MSI board, though not directly listed on theretroweb.

Right to repair is fundamental. You own it, you're allowed to fix it.
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