Jed118 wrote:

Now, I have some questions for you guys - This motherboard has 128k Cache, with slots to add more, but the "jumpers" are permane […]
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Now, I have some questions for you guys - This motherboard has 128k Cache, with slots to add more, but the "jumpers" are permanently soldered - Nothing I can't handle, but I know NOTHING about cache chips, where to buy them, what to buy, something about a tag chip... How can I get 256K on there?

Another question - The EXP4349 has a wicked BIOS - can I swap out the BIOS chips just like that, or will that send current into places it shouldn't, damaging something?

How can I connect this beast to the internet through Windows 3.11 (purely for shits and giggles) -I have never done this, my first internet computer had Windows 95 on it.

Does anyone want the OPTI495SLC to rebuild? I don't want to throw it out, so if someone can use it somehow, PM me.

EDIT: I suspect there may be a virus on the computer - I inherited a box FULL of diskettes, and I used some of them already. While I am not keen on scanning 300+ diskettes, how can I scan my computer for viruses?

IN ORDER:

1: Short answer, you will need 4 more chips like the ones soldered in as well as the tag ram chip. I'd have to research a bit to find out what tag ram you would need, but install the chips, remove the original jumpers and install new ones. Its not an easy task, but doable.
2: NO. There might be an update around the web somewhere if you are lucky. If not, grin and bear it.
3: i'm sure someone will. I currently have to many pans in the fire as it is.
4: unlikely its a virus. I've never seen one in in 25+ years of computing and i've been to many many shady places on the internet. That said, go here for antivirus: [SOLVED] Best DOS antivirus?

I'm looking around for a spare 386 or 386/486 combo motherboard but, one that is still operational. Unfortunately, some of the prices on eBay are ludicrous.
Has to have the PGA sockets for the CPU and math co-processor so that I can just drop in my CPU (as I have a spare AMD 386DX-40 CPU lying around).

I also have a Cyrix 486DLC-40 with it's math co-processor nicely tucked away in a old Chicony 386 motherboard and it's still going strong (Winbond 16-bit IDE controller, Sound Galaxy Basic 16, 360 kb & 1.44 MB floppy drives, 204 MB HDD and a Tseng Labs ET4000AX 16-bit graphics card to round it off).
Initially, I also had some trouble to get the motherboard to recognise the Cyrix CPU (worked fine with the AMD386) and later on realised that I had to select the factory default settings in the BIOS (the "non" optimal setting where everything is usually disabled), save it, and re-boot.
Then, go into the BIOS again and manually change the settings to the optimal settings (i.e., enable cache, System Bios cacheable, Video Bios cacheable, etc.)

Nice build. 😁

Do you plan on using some VLB graphic card?

Is it possible for you to make some benchmarks? It would be great if you used the Phils Benchmark suit - here are the instructions and download:
Phil's Ultimate VGA Benchmark Database Project

I also like to see Speedsys and Chkcache benches.