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How about a MR-BIOS ROM file repository?

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Reply 180 of 187, by Sedrosken

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The UM480 variants all seem to lock up with my GA-486VM. The variant I settled on earlier in the thread comes the closest to working completely -- it detects the CPU fine, detects the proper amount of RAM and L2, and then locks up before I can even get into setup. I'm assuming it has something to do with how my DX4 OverDrive behaves -- apparently it "helpfully" disables L2 on machines it deems not fully compatible. Whether that means it just doesn't like having 16K L1, or something else is at play, I don't know. However, I'm honestly willing to just let sleeping dogs lie at this point and use my original AMIBIOS with no L2, since in my testing with my DX2-66 having L2 enabled dramatically increased my RAM access times to the point that with it enabled, the numbers were higher in benchmarks, but with it disabled the machine felt faster and was more consistent. I got more out of setting my RAM to 0WS than I ever did from having L2 anyway.

Reply 181 of 187, by Anonymous Coward

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mt777 wrote on 2020-09-16, 01:24:
MRVFONE wrote on 2020-08-25, 08:50:

Has anyone had issues getting into the MR BIOS menu?? Mine says to press ESC.... But nothing happnes. Tryed a diffrent keyboard.. no change. The leds blink on the keyboards when there pluged in etc.... Have to see if i can find an old DIN type plug just in case...

I had similiar problems with asus 386 when FPU was improper set via jumper

Try CTRL-ALT-ESC instead.

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Reply 182 of 187, by MrKsoft

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For reference, wanted to document some attempts I made with a few of these BIOSes on a Diamond Flower 386/25-33-40UCE Rev A board. (Board is extremely similar to the 386/33-40UCE that has available jumper info online-- but it isn't the same board! The locations of everything are moved around ever so slightly...) The board uses the UMC UM82C481BF/UM82C482AF chipset. That lines up with the following files listed earlier in the thread:

V037B301 UMC_301 UMC WriteBack 82C48X 386 WriteBack, Rev 0 *ONLY*
V037B302 UMC_302 UMC WriteBack 82C48X 386 WriteBack, Rev A,B *ONLY* (Not REV-0 !)
V037B304 UMC_304 UMC WriteBack 82C48X 386 WriteBack, Rev A,B *ONLY* (Not REV-0 !) x037b302, for Cyrix layout with A20M and FLUSH

None of these worked 100% correctly. V037B301 just causes the speaker to emit a low tone (probably expected since it's "Rev 0 Only"). V037B302 and V037B304 boot fine but only detected memory in Bank 0. (I have eight 1MB SIMMs installed across Bank 0 and Bank 1, which are detected and functional on the original AMIBIOS). I don't expect there's really a solution to this, but I thought I'd report it as it could affect other UM82C48x boards.

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Reply 183 of 187, by 386_junkie

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I have a about 6 or 7 motherboards (386) with MR BIOS ROM's... have been meaning to dump / back them up.

I recall there may be a way to do it in DOS without requiring a EPROM programmer, it that right?

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Reply 184 of 187, by keropi

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386_junkie wrote on 2020-09-22, 18:27:

I have a about 6 or 7 motherboards (386) with MR BIOS ROM's... have been meaning to dump / back them up.

I recall there may be a way to do it in DOS without requiring a EPROM programmer, it that right?

programmer is the best to use, software methods are not 100%
you will get some data but it would not be the data on the eprom and thus will be unusable
we've faced this on the amstrad 486slc bios images, software grabbers like NSSI did not produce correct data

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Reply 185 of 187, by Am386DX-40

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Guys, I have a Seritech SER-386ADIII with ALI M1429/M1431 chipset. Every time I install an FPU it hangs and won't boot, or be very very unstable. Was thinking of trying a MR-BIOS with it, but I haven't found any for ALI chipsets. Is there anything out there?

Photo taken from another user:

7dnIS5P.jpg

Reply 186 of 187, by jesolo

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Am386DX-40 wrote on 2020-10-03, 05:45:
Guys, I have a Seritech SER-386ADIII with ALI M1429/M1431 chipset. Every time I install an FPU it hangs and won't boot, or be ve […]
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Guys, I have a Seritech SER-386ADIII with ALI M1429/M1431 chipset. Every time I install an FPU it hangs and won't boot, or be very very unstable. Was thinking of trying a MR-BIOS with it, but I haven't found any for ALI chipsets. Is there anything out there?

Photo taken from another user:

7dnIS5P.jpg

Firstly, desolder that barrel battery before it causes damage.

There might be a jumper on the motherboard that enables and disables the FPU. Have a look on Th99 to see if you can identify your board.

The chipset is the ALI M1429, which was quite a common chipset used by 386 motherboards from that era.

Reply 187 of 187, by Am386DX-40

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jesolo wrote on 2020-10-03, 07:57:
Firstly, desolder that barrel battery before it causes damage. […]
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Am386DX-40 wrote on 2020-10-03, 05:45:
Guys, I have a Seritech SER-386ADIII with ALI M1429/M1431 chipset. Every time I install an FPU it hangs and won't boot, or be ve […]
Show full quote

Guys, I have a Seritech SER-386ADIII with ALI M1429/M1431 chipset. Every time I install an FPU it hangs and won't boot, or be very very unstable. Was thinking of trying a MR-BIOS with it, but I haven't found any for ALI chipsets. Is there anything out there?

Photo taken from another user:

7dnIS5P.jpg

Firstly, desolder that barrel battery before it causes damage.

There might be a jumper on the motherboard that enables and disables the FPU. Have a look on Th99 to see if you can identify your board.

The chipset is the ALI M1429, which was quite a common chipset used by 386 motherboards from that era.

That's not my actual board, it's a picture I found here on vogons. It's exactly the same though. There's no jumper for FPU, just an option in the bios to try to detect it or not.