VOGONS

Search

Common searches

Problem with MV035 OPTi 486 motherboard

Topic actions

First post, by RiP

Posted on 
User metadata
Rank Member
Rank
Member

I have found an MV035 REV.F motherboard which works fine but it didn't have voltage regulator.
So I added SPX2815AU Adjustable (LT1086 compatible) to it but now it doesn't work at 3.45V
It booted fine with AMD 5x86 at 3.3V but I worry since this CPU needs 3.45V 😐

Another problem is that I wanted to use four 64KB cache chips but seems it requires 16KB tag RAM.
Sadly, 16KB chip is rare and it doesn't work with 32KB tag RAM unless I use eight 32KB cache chips 😵

https://stason.org/TULARC/pc/motherboards/D/D … -BUS-MV035.html
http://www.elhvb.com/mobokive/Archive/Edom/ma … mv035/mv035.htm

Reply 2 of 5, by RiP

Posted on 
User metadata
Rank Member
Rank
Member

Oh, seems the voltage jumper was faulty. I replaced it and the motherboard works fine at 3.45V now 😊

derSammler wrote:

As for voltage, the datasheet says:

"VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3 V ±0.3 V"

So anything from 3.0 to 3.6 is fine.

Then won't it work at 4.0V ?
What about LT1086?

Reply 5 of 5, by RiP

Posted on 
User metadata
Rank Member
Rank
Member
derSammler wrote:

As for voltage, the datasheet says:

"VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3 V ±0.3 V"

So anything from 3.0 to 3.6 is fine.

Where did you find it?

Oh, just solved all the problems. The cache chips were fake 😵
Now it works with four 64KB cache chips and even 32KB tag RAM 😊

Attachments

  • fake.jpg
    Filename
    fake.jpg
    File size
    131.13 KiB
    Views
    406 views
    File license
    Fair use/fair dealing exception
Go to top of page Go to top of page
Back to General Old Hardware
Close window
Close window