Young Micro VEGA 486F-2VL

http://stason.org/TULARC/pc/motherboards/Y/YO … A-486F-2VL.html

Awesome! 😁

Is the board any good in your opinion?
I see it supports DX2, my DX2 66 will probably work better than in the UM486 board.

Re: UM486/UM486SX need manual / question

Its a typical generic VLB motherboard from 1992ish. Nothing special. 5v only, no power management and no Pentium Overdrive support. Likely only supports write through mode L2 cache too.

I did find on vogons that Symphony chip isn't so common, but it packs a neat punch.

Any way to test it for features / stability?
I have Trident VGUI 9400CXi VLB.

Hmm that dallas clock / battery thing is a double edged sword. One the one hand it probably saved it from an acid attack, and on the other now you're stuck with a dead battery. I don't see an external battery header mentioned on stason - can you see one on the board?

There's a good chance that the Dallas battery on that board is socketted, so you should be able to change it easily with a replacement if that's the c ase.

I once owned this board, but there was something wrong and I couldn't get it to post. I ended up having to toss it while I was downsizing, which is too bad because I've always wanted to play with a Symphony VLB motherboard as I always liked my ISA only Symphony board.
There actually is one thing very unusual about this board, it supports 1024kb cache. This must have been one of the first boards to do so as it still has a 487 overdrive socket.

The Dallas battery, or Symphony SL1287 as it says on it is indeed socketed and I've just removed it.
It also says on the chip when you turn it upside down: 302AACP Philippines

I don't have 128kB cache modules to test it out.
Can you suggest me a way to test its stability? I can use my SCSI controller for hard drives.

Using a DMA SCSI controller under a 32-bit OS is always a good way to test for stability. If your SCSI card is VLB I'm not sure I'd bother as those were always problematic cards to begin with.

I've heard that running a program called memtest also works pretty well. You might want to look into that.

I also have a symphony 486 motherboard but it looks vastly different to yours.

pics?

hehe I store my motherboards at the bottom of a a few storage containers but I managed to get it out...

I have never used this board but I've had it a long time.

486-ISA Symphony motherboard

Ah, interesting. It doesn't have VLB, so it's nearly the same as my DTK PKM 0031Y except that it has a 4167 socket instead of a P23T socket, and it's made by Asus. I didn't know Asus made any bords that used this chipset.

Cool board 😁

Mine SCSI Controller is Adaptec AHA - 1542B , 16BIT ISA SCSI and Floppy controller.
I have many different SCSI drives and IDE drives. But i don't have a good IDE controller.
I can use my IBM UltraStar to do this test.

Can you inform me a little more, I haven't done an system stress test on old PCs before.

The 1542B may not be the best card for the job. I've never actually owned that particular model (I have 1542C, 1540C, 1542CP) but I have seen reports of compatibility issues with the 1542B cards. I guess some of the problems may have been fixed through BIOS updates. Those cards are too old to use flash BIOSes of course.

None the less, if you really want to stress the system you should try to install and run a true 32-bit OS on it (like NT or Linux). Try running some time demos, or some DOS games that use 32-bit extenders that really push the CPU. Try to run a SCSI card with DMA enabled and the ASPI drivers loaded while you're doing all this. I think you should probably install and run MEMTEST first though. I would also hold off on tweaking your BIOS settings until you can establish stability at conservative memory timings.

I ran some benchmarks on my Symphony 486 board. Mine has pretty impressive uncached memory performance. With a Cyrix 5x86, I get 42MB/sec at 3x33MHz. That's pretty bloody impressive for an ISA only board. Windows 3.1 offers a pretty nice experience with Mach64 and Cyrix 5x86 installed.

I managed to get AHA 1542CF.
What benchmarks would you suggest?

I have DX 33MHz, DX2 66MHz.

If you have some time please download the benchmarks and submit the scores into the benchmark database:

Phil's Ultimate VGA Benchmark Database Project

Sure thing! 😀
But i should first get a decent VGA adapter 🤣