VOGONS


First post, by NautilusComputer

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Okay folks, I'm trying to identify this board I picked up. It's apparently not as easy as 'Oh, it's an Asus ISA-486SV2.'

From searches here on Vogons, I've found there are at least THREE 'versions' of this board that all have 3.1 as their silkscreen:

  • ver. 3.1 WITH VLB slots, Socket 3 ZIF
  • ver. 3.1 WITHOUT VLB slots, Socket 1LIF
  • ver. 3.1 WITH VLB slots, Socket 2 OverDrive ZIF (mine)

Anyone know if there are other differences as well?

I tried to get mine to fire up the other day, but no luck. Not sure if it's the board or the Trident video card, though. Board owners - what are the common things to be wrong with this board? The Varta was clipped but I haven't replaced it with an external battery or CR2032 holder yet. Will that prevent it from booting?

https://i.imgur.com/6DkvIgP.jpeg

https://i.imgur.com/kSnEd9u.jpeg

https://i.imgur.com/awtT4XW.jpeg

https://i.imgur.com/cOwXoNZ.jpeg

Reply 1 of 3, by Horun

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Yours is a Rev 3.1 there is also Rev 2.9 with either OD socket or PGA socket, and Rev 3.10 with Soc 3 plus other versions.....
No not having a battery on that era board should not prevent booting. Most common issue is jumpers set wrong or ram not compatible with board.
One other thing: if the cache is bad or cache jumpers are set wrong most older boards usually play dead....
Do you have a speaker you can attach and see if it beeps ?

Hate posting a reply and have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. 🤣 Second computer a 286 12Mhz with real IDE drive ! After that came 386, 486, Pentium, P.Pro and everything after....

Reply 2 of 3, by NautilusComputer

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Horun wrote on 2020-09-28, 00:50:
Yours is a Rev 3.1 there is also Rev 2.9 with either OD socket or PGA socket, and Rev 3.10 with Soc 3 plus other versions..... N […]
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Yours is a Rev 3.1 there is also Rev 2.9 with either OD socket or PGA socket, and Rev 3.10 with Soc 3 plus other versions.....
No not having a battery on that era board should not prevent booting. Most common issue is jumpers set wrong or ram not compatible with board.
One other thing: if the cache is bad or cache jumpers are set wrong most older boards usually play dead....
Do you have a speaker you can attach and see if it beeps ?

I believe I can hunt one up tomorrow. I did go through the jumpers for the CPU settings for the DX2-50 that's in the board now and they were OK; I didn't do a visual verify on the cache jumpers. I did see that it looks like the cache was upgraded at some point as the chips are two different manufacturers, so maybe they are off.

Reply 3 of 3, by NautilusComputer

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Updates:

Found a spare buzzer I was keeping for just this kind of thing - was getting what I would call '3 long beeps.'

According to a post I found on StackExchange, my issue very well may be that I only have 2 sticks of RAM in the board. From a reply on this page:

I see you have quite an early board with 30-pin SIMMs, which each provide 8 bits width to the data bus. Since the 486 is a 32-bit bus CPU (unlike the 386 it was never made in a 16-bit bus variant), you always need 4 identical SIMMs together. If you had a board that took 72-pin SIMMs, which have 32-bit width each, you'd be able to try just one like you are.

The effect of fitting just one SIMM in this machine would be to provide storage only at one out of every four bytes in sequence. Software just isn't written to cope with that on the PC.

I did get more in the mail the other day, but board is at work and additional RAM is at home. Hopefully they match close enough to the two that came with the board to be able to use as a set of 4. If not, I'll need to source matched quads of RAM.

*sigh*