kdr wrote on 2020-10-17, 11:43:

But in the case of the ERGO480 and SPEGASYNC cards, it's absolutely the RAM speed that prevents the card from working at 10Mhz. The SPEGASYNC has 120ns RAM and only works reliably at 8Mhz, while the ERGO480 has 100ns RAM and it works reliably at 10Mhz. I even did some crazy stuff like swapping the EGA chips and the custom gate array between the two cards, since they're nominally the same chips on both cards. (The RAM, alas, is not socketed.) While I agree that the ISA bus speed *shouldn't* have an effect, given that the sequencer which controls the video RAM timing is clocked by the video dot clock, some aspect of the memory read/write timing is influenced by what speed the ISA bus is running at.

Wait a second - the ERGO480 does not just have faster RAM, it also has a faster dot clock. The SPEGASYNC runs at 14.318/16.267MHz, and the ERGO480 runs at 28.5/32.0. So the memory access is way faster on the ERGO480, because the sequencer is clocked at approximately twice the speed. Did you already try swapping the crystals to detect whether the dot clock or the RAM speed is the significant difference?

mkarcher wrote on 2020-10-17, 13:40:

Wait a second - the ERGO480 does not just have faster RAM, it also has a faster dot clock. The SPEGASYNC runs at 14.318/16.267MHz, and the ERGO480 runs at 28.5/32.0. So the memory access is way faster on the ERGO480, because the sequencer is clocked at approximately twice the speed. Did you already try swapping the crystals to detect whether the dot clock or the RAM speed is the significant difference?

Ah, my bad -- you are absolutely correct.

I think this would be a good candidate for a pinned post. I mean, how many vintage computer enthusiasts never have trouble finding obscure BIOS images?

486 #68
The motherboard is actually a ABit AV4, "VL-BUS 486 MAIN BOARD" isn't the right name (I bet you that it was what was written on the manual's first page)
I have added the BIOS and photo here http://www.win3x.org/uh19/motherboard/show/79

#69 PAT48AV bios string: 40-0106-001291-00101111-080893-ALI1429 is a TMC (Taiwan MyComp Corporation) motherboard by ID code
and looks like this one: https://retronn.de/imports/hwgal/hw_486er_PAT48AV.html
jumpers: https://www.elhvb.com/mboards/tmc-mycomp/486/PAT48AV.html

#70 MBA-029 bios string: 30-0200-ZZ1594-00101111-070791-SISAUTO is a Mitac motherboard by ID code
have not looked into which Mitac board model it could be....

486 #70 and #71 : Abit AX4 which I completed here http://www.win3x.org/uh19/motherboard/show/67

Predator99 wrote on 2020-10-10, 07:34:

Changed, thanks!

Could you try this UMC 82C481 AMIBIOS on your PCChips M317 board ?
http://www.win3x.org/uh19/motherboard/show/2121
, or one of these two here
http://www.win3x.org/uh19/motherboard/show/2134

I have a suspicion that CHIP 5 and 6 are UMC clones.

I can do this when I test the board, may take some time...

TheMobRules wrote on 2021-01-16, 22:54:

#84 Manufacturer/Identifier: 386A (unknown manufacturer) Chipset: CHIPS P82C301/2/5 + P82A303/4/6 + P82C206 BIOS/Version: AMI 38 […]
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#84
Manufacturer/Identifier: 386A (unknown manufacturer)
Chipset: CHIPS P82C301/2/5 + P82A303/4/6 + P82C206
BIOS/Version: AMI 386-BIOS / 386A V1.1 05-19-90 (2 x 27C256)

386A.zip

386A.jpg

Note 1: warranty label on the back may indicate manufacturer is ECS
Note 2: TH99 is wrong regarding JP7, it does not switch between internal/external battery, it actually selects between generating internal PG signal (INT) or using the PG line from PSU (EXT)

Can you please show us the POST string ? It's an AMI bios for sure but it's an old one and extracting the POST string from them is much harder.

486 #80
Manufacturer/Identifier: ASUS ISA-486

Nice !! Does it boot up proper ? do not own any Asus 486 🙁

386 #84 Agree ! probably ECS, the stickers on BIOS have AMI-1131 which would be ECS if correct.
Interesting on the JP7" it actually selects between generating internal PG signal (INT) or using the PG line from PSU (EXT)" have seen a jumper like that before though have not seen any AT supplies w/o a power good line (including the old 1988 XT supply in storage) and never figured out why they would have a jumper for it 😀.
TH99 does have errors but that appears to be the only error on 30499.htm compared to your board unless you found something else.

Deksor wrote on 2021-01-17, 01:27:

Can you please show us the POST string ? It's an AMI bios for sure but it's an old one and extracting the POST string from them is much harder.

Sure, I will get the ID once I bring back the PC with that board to my desk (it's currently stored) in order to boot it up.

Horun wrote on 2021-01-17, 03:33:

486 #80
Manufacturer/Identifier: ASUS ISA-486

Nice !! Does it boot up proper ? do not own any Asus 486 🙁

Yes, it is really nice, at least for an ISA-only 486. I'm currently using a standard DX-33 as you can see, but if at some point I manage to get a DX-50 I'd like to do some kind of "ultimate pre-DX2/pre-VLB" 486 build (would also need to change the socketed oscillator for a 50MHz one).

Horun wrote on 2021-01-17, 05:12:

Interesting on the JP7" it actually selects between generating internal PG signal (INT) or using the PG line from PSU (EXT)" have seen a jumper like that before though have not seen any AT supplies w/o a power good line (including the old 1988 XT supply in storage) and never figured out why they would have a jumper for it 😀.

It is strange yes, based on my observations it seems the motherboard has a chip and a few other discrete components next to JP7 that generate the PG signal if you set the jumper to INT, and if you select EXT it just connects directly to the PG pin of the power connector.

Coincidentally, the ASUS board also has a jumper like that, and neither of the boards actually support an "internal" battery, they only have a 4-pin connector for an external battery pack, which is probably one of the reasons of their good condition, no barrel batteries to mess things up!

Horun wrote on 2021-01-17, 05:12:

TH99 does have errors but that appears to be the only error on 30499.htm compared to your board unless you found something else.

Something else I'm not so sure about is jumpers JP2/JP2A/JP3/JP3A to set the sizes of the memory banks. In the TH99 page it is listed as "pins 1&2 closed" for all jumpers and all memory sizes. That setting does work for me with 8MB, but I haven't really tinkered with different memory sizes.

I had time to test 386 #82
It seems to be Chaintech ELT-386SX-160D
http://www.win3x.org/uh19/motherboard/show/5344

Hi
I have a BIOS that doesn't seem to be featured, I have dumped it and am happy to upload it, but I'm just not sure where to put it. Its a motherboard I bought the other day for cheap. It is a DFI TOP-286 board, however, it has an Evergreen 286-486 upgrade fitted and seems to be running a 386 BIOS... If anyone can recommend where it should go, I have 2x BIOS ROM binaries, a photo of the board and a photo of the BIOS string.
Cheers
Skip

Deksor wrote on 2021-01-17, 01:27:

Can you please show us the POST string ? It's an AMI bios for sure but it's an old one and extracting the POST string from them is much harder.

I added the BIOS string ID to my post and confirmed manufacturer of this 386 board is ECS/Elitegroup (1311):

Thanks !!

This motherboard was previously "unidentified" in UH19 😀

I've added your photo and your bios + I corrected the brand http://www.win3x.org/uh19/motherboard/show/5268

Maybe a silly question.

I'm about to upload my BIOS from my Aquarius MB-4DUV rev 3.1 somewhere on the forum, but I'm too lazy now to take my whole computer apart and take a photo of the motherboard.

Does the BIOS still being in the 486 BIOS collection thread? Or would you like it somewhere else to be posted?

I don't know for this thread, but I'm interested by it for UH19 😀

Can you give me at least some details about your motherboard ?
What UMC chipset does it use, does it have 30 pin slots as well as 72 pin slots or just 72 pin slots ?
There are two candidates on UR so I'd like to know which one is the right one

https://www.ultimateretro.net/motherboards/639
https://www.ultimateretro.net/motherboards/640

Deksor wrote on 2021-02-24, 00:12:

I don't know for this thread, but I'm interested by it for UH19 :) […]
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I don't know for this thread, but I'm interested by it for UH19 😀

Can you give me at least some details about your motherboard ?
What UMC chipset does it use, does it have 30 pin slots as well as 72 pin slots or just 72 pin slots ?
There are two candidates on UH19 so I'd like to know which one is the right one

http://www.win3x.org/uh19/motherboard/show/639
http://www.win3x.org/uh19/motherboard/show/640

I knew you'd like to have the BIOS 😀

My board is almost the second one: it only has 4 72p slots and no 30p slots. I also used the jumper settings from that one to set up my board.
The main difference is, the voltage jumpers are different. I can only choose between 3,45 and 5 volts. No 3,3 or 4 volt options. No unused pads for pin headers either.

The chipset is the UM8498F / UM8496F

Predator99 wrote on 2021-04-01, 12:02:

#92 […]
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#92

Manufacturer/Identifier: MSI MS-4132 G ver. 1
Chipset: SiS 85C471/85C407
BIOS String: 40-07Z5-008031-00101111-121593-SIS471

I'm pretty sure this is a Zida 4DVS, not an MSI.

http://www.win3x.org/uh19/motherboard/show/6881

40-07Z5-008031 - this further indicates my point