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Re: The bizzaro 386 / 486... or something build

Posted on 2023-07-17, 15:24

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok, So I found the original databook / datasheets for the opti chipset and sure enough they want a 16*1 chip in that dirty bit socket. I had a look at the socket and I think our idea with a *4 will work, three pins are just without traces :) Also, as an experiment I overclocked the 386 to 40mhz with …

Re: Need help identifying this 386 motherboard please

Posted on 2023-07-15, 22:52

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

They didn't skimp on the SIMM slots hey ? ☺️

Re: The bizzaro 386 / 486... or something build

Posted on 2023-07-13, 22:16

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hmmmm, the plot thickens! Thanks for the help with the maths there mkarcher, that makes sense: it would be perfectly sized for up to 256 and no more. I wonder if I should set the jumpers and buzz out the socket to see what's connected for that last weird 16*1 chip? That might show something, or …

Re: The bizzaro 386 / 486... or something build

Posted on 2023-07-13, 21:22

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Any chance that manual could be misprinted? Is 16k by 1 even large enough for the dirty bits that 128/256k would require? Just my luck, 🤣

Re: The bizzaro 386 / 486... or something build

Posted on 2023-07-13, 21:03

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah, that's the one particularly that'll be a real pain in the neck to acquire I think. I'll keep an eye, but it might be a non-starter.

Re: The bizzaro 386 / 486... or something build

Posted on 2023-07-13, 20:37

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks for the post! Ah, the reason I think that is because per the manual: https://stason.org/TULARC/pc/motherboards/D/DASH-COMPUTER-INC-386-DC-386-WB-WRITE-BACK-CACHE.html Claimed cache config: Screenshot_20230713_174027_Firefox.jpg That's what it's telling me I need. That said, eh, the quality of …

Re: The bizzaro 386 / 486... or something build

Posted on 2023-07-13, 17:26

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Next thing I was looking at, cache. The board has 64k, but since I have 32Meg on board I reckon 128k is a better start. I found what I think might be the right chips, the ISSI IS61C256AH. What I can't find quite as easily are the tag and dirty bit chips. I'm going to have to look at that a bit more, …

Re: The bizzaro 386 / 486... or something build

Posted on 2023-07-13, 17:15

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

A slightly better look at how the motherboard -just- fits here. I have a blank IO shield I'll put a hole in for the keyboard, or I might not and get an ISA slot PS2 connector and wire that onto the board instead. 20230712_194255.jpg Today Windows 95 goes on. It's, uh, not exactly spritely but I hope …

Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2023-07-12, 16:54

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If it was me, I'd upload everything into a GitHub (or something similar) and have versioning. I think Sphere is correct: being able to look back at even broken/buggy versions can be immensely helpful at times. As for licencing details: pointless waste of time. The time spent discussing it is more …

Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2023-07-10, 20:22

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'd like one! I didn't order for six dollars, I just got here. 🤣

The bizzaro 386 / 486... or something build

Posted on 2023-07-10, 17:54

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi everyone! I found this motherboard: it's a DC386WB, with a mighty powerful 386DX33 on it! It even works! 20230516_165620.jpg It has some signs of a slightly leaking varta battery at some point, but I cleaned that all up and replaced it with a super capacitor for the time being. I also found a MR …

Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2023-07-09, 12:32

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just a quick note to say that releasing this fully public domain is a BOSS move. Thanks so much for your hard work, last night I bought a slx2-66 in anticipation of giving this project a go. 😊

Re: GD5422 BIOS weirdness

Posted on 2022-01-13, 17:48

in Marvin \ Video

in Marvin \ Video

Yep same 256 EPROMS each time. 😀 Not sure about MCA, I'd think probably not.

Re: GD5422 BIOS weirdness

Posted on 2022-01-13, 16:37

in Marvin \ Video

in Marvin \ Video

Looking at those files... 06h6915.bin is a normal bios you should write to an eeprom. bios1.41.bin is fubar. Yeah.... You might want to read the whole thread from the start and you'll see why that is. Writing the first .bin to an EPROM will not work at all for this card. Might work great for other …

Re: GD5422 BIOS weirdness

Posted on 2022-01-13, 16:21

in Marvin \ Video

in Marvin \ Video

Yes, that BIOS is in normal straightforward format - so I split it even and odd and copied it back /b even+odd, just as I've been doing so far with success. No dice on this BIOS for some reason though. I've attached the file I built for reference, and the file it's originally built from. I think …

Re: GD5422 BIOS weirdness

Posted on 2022-01-13, 15:59

in Marvin \ Video

in Marvin \ Video

Yes, I meant to do that earlier! Top: Filename Top.jpg File size 1.42 MiB Views 961 views Bottom: Filename Bottom.jpg File size 1.26 MiB Views 961 views

Re: GD5422 BIOS weirdness

Posted on 2022-01-13, 15:22

in Marvin \ Video

in Marvin \ Video

Well, I ran that BIOS through the even/odd splitter and burnt it to an EPROM for my card... Sadly, it did NOT work: 'Eeeek, NO VGA!!' post beeps galore. We've already more than established that my card is weird though, so maybe you'll have much better luck? Fingers crossed here! 😁

Re: GD5422 BIOS weirdness

Posted on 2022-01-13, 12:55

in Marvin \ Video

in Marvin \ Video

Oh, I actually found 1.41 here: https://ardent-tool.com/video/1MB_Short_SVGA.html I'll give that a go today! 😀

Re: GD5422 BIOS weirdness

Posted on 2022-01-12, 22:40

in Marvin \ Video

in Marvin \ Video

Yeah.... Ah well, not sure it would make a huge difference anyways! Thanks a lot for taking a look. 😀

Re: GD5422 BIOS weirdness

Posted on 2022-01-12, 22:01

in Marvin \ Video

in Marvin \ Video

Yeah I wondered about that, but a bit outside my experience of hex editing!! I attach the executable that has the 1.41 BIOS in it. This runs great from DOS and all, but of course I figure better loaded from ROM, and if it's in the ROM it should work for any hard coded BIOS routine calls.

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