OPTi-495SLC & 386DX-33 \ VOGONS

OPTi-495SLC & 386DX-33

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First post, by pan069

Posted on 2019-06-29, 00:58

pan069 Offline

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I have this OPTi-495SLC board and I'm trying to configure it for my Intel 386DX-33 CPU (PGA). However, looking at the Stason jumper settings, it kinda seems to give me conflicting instructions (or I'm just reading it wrong which could very well be the case).

https://stason.org/TULARC/pc/motherboards/U/U … 86WB-CACHE.html

Under the section "80386 AND CX80486DLC CPU CONFIGURATION", for 33Mhz it list the following:

1Speed JP6    JP7    JP8  JP9        JP22 
2
333MHz closed closed open pins 2 & 3 open

But then for "CPU SPEED CONFIGURATION" is says:

1CPU Type  JP6   JP7   JP8     JP9         JP22
2
333MHz     open  open  closed  pins 1 & 2  open

Which is basically the opposite...

I also found this alternative manual, but it doesn't seems to cover the 386DX-PGA installation 🙁

http://www.elhvb.com/webhq/models/486vlb2/opti495slc.htm

Thoughts welcome...

Reply 1 of 6, by Caluser2000

Posted on 2019-06-29, 01:15

Caluser2000 Offline

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Looks like the first listing is for the 386 socket side(486DLCs are basicly 386s with some L1 cache) and the second proper 486 side, notice the 25 and 50i match and the 33 and 66i match.

There's a glitch in the matrix.
A founding member of the 286 appreciation society.
Apparently 32-bit is dead and nobody likes P4s.
Of course, as always, I'm open to correction...😉

Reply 2 of 6, by pan069

Posted on 2019-06-29, 01:43

pan069 Offline

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Ah, OK. So you're saying that when the CPU type is 486 that the Mhz is selected under the "CPU SPEED CONFIGURATION" and that it doesn't apply to 386 config. That makes sense.

That means that in my case under the "80386 AND CX80486DLC CPU CONFIGURATION" I select the 33Mhz and under "CPU TYPE SELECT" I select the PGA option. The "CPU SPEED CONFIGURATION" selection is than irrelevant for my config.

One more question though, the board has 2 VLB slots. I assume these only work in 486 mode?

Reply 3 of 6, by Caluser2000

Posted on 2019-06-29, 02:13

Caluser2000 Offline

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According to this brochure vlb peripherals are available the both 386s and 486s

Filename: DXSLC_Brochure_1992.pdf
File size: 973.03 KiB
Downloads: 102 downloads
File license: Fair use/fair dealing exception

It's a pretty neat mobo.

There's a glitch in the matrix.
A founding member of the 286 appreciation society.
Apparently 32-bit is dead and nobody likes P4s.
Of course, as always, I'm open to correction...😉

Reply 4 of 6, by alvaro84

Posted on 2019-06-29, 03:04

alvaro84 Offline

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pan069 wrote:
One more question though, the board has 2 VLB slots. I assume these only work in 486 mode?

I have used a 386 and VLB in a similar board, at once.

Shame on us, doomed from the start
May God have mercy on our dirty little hearts

Reply 5 of 6, by pan069

Posted on 2019-06-29, 03:07

pan069 Offline

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Posts: 891
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Awesome. Thanks for finding that. Yeah, seems like a neat board indeed... 😀

Reply 6 of 6, by Caluser2000

Posted on 2019-06-29, 03:51

Caluser2000 Offline

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Rank: l33t
Posts: 3672
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No worries mate. Have fun.

There's a glitch in the matrix.
A founding member of the 286 appreciation society.
Apparently 32-bit is dead and nobody likes P4s.
Of course, as always, I'm open to correction...😉

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