VOGONS

Search

Common searches

How to configure 486 Mainboard correctly for Am5x86 X5-133 ADZ

Topic actions

First post, by srmeister

Posted on 
User metadata
Rank Newbie
Rank
Newbie

Hello,
i have a 486 Mainboard "MSI MS-4144" that originally came with an Intel 486 DX2-66Mhz and i upgraded it with an AMD 5x86 X5-133 ADZ.
When i tried to boot from floppy to install MS-DOS 6.22 it would hang at "Starting MS-DOS" until i disabled L1 Cache in the Award BIOS. Other cache related BIOS settings didnt help (ex. setting Write-Through or Write-Back or disabling L2 Cache).
I got the hint to disable L1 Cache from DOS Hang on floppy boot where someone had the same problem.

So i went ahead and re-checked the board if it was configured correctly regarding the CPU jumpers JC1 - JC6 but i am right now unable to identify how i have to set the jumpers. Maybe someone could give me some tips?
I think it is still configured for its original Intel 66Mhz CPU.
Also, the PC did not come with these Resistor Arrays(you can check in the pics - JC1 and JC6) but i assume, if i had to use them, these are zero Ohm arrays and i could probably still buy them?

Edit: Just so you dont get me wrong, the voltage is already set to 3,45V and the FSB is set to 33Mhz and the CPU Multiplier is set to 2x. I am just unsure how to set JC1-JC6 since the manual doesnt say what these jumpers do.

Attachments

  • 4144p2-8.JPG
    Filename
    4144p2-8.JPG
    File size
    158.98 KiB
    Views
    548 views
    File license
    Public domain
  • 4144p2-6.JPG
    Filename
    4144p2-6.JPG
    File size
    177.73 KiB
    Views
    548 views
    File license
    Public domain
  • IMG_20201103_144442.jpg
    Filename
    IMG_20201103_144442.jpg
    File size
    1.15 MiB
    Views
    548 views
    File license
    Public domain
  • IMG_20201103_144222.jpg
    Filename
    IMG_20201103_144222.jpg
    File size
    1.81 MiB
    Views
    548 views
    File license
    Public domain
Last edited by srmeister on 2020-11-03, 14:24. Edited 1 time in total.

Reply 1 of 8, by debs3759

Posted on 
User metadata
Rank Oldbie
Rank
Oldbie

The manual pages you posted don't show settings for a 5x86. Are you sure it's supported?

See my graphics card database at www.gpuzoo.com
Constantly being worked on. Feel free to message me with any corrections or details of cards you would like me to research and add.

Reply 2 of 8, by srmeister

Posted on 
User metadata
Rank Newbie
Rank
Newbie

it does work okay although i am unsure if it is used to its full potential. The manual doesnt state what the jumpers JC1-JC6 do, just how to set them. I thought the 5x86 is similar to"AMD Enhanced AM486"but i am not sure at all.
I assume that JC6 position 6-7 is probably setting L1 Cache WB mode. I have totally no idea what the resistor arrays JC1 and JC3 are for.

Reply 3 of 8, by mpe

Posted on 
User metadata
Rank Oldbie
Rank
Oldbie

I have the same board (there are several revisions though) and was running 5x86 on it. Can pul it out of the storage and take a picture of my settings.

But just looking at the docs it looks like you are missing the resistor array in JC1:

DSC_8447.jpeg
Filename
DSC_8447.jpeg
File size
70.17 KiB
Views
529 views
File license
Public domain

The 5x86 uses Intel DX4 pinout so no issues there.

Blog|NexGen 586|S4

Reply 4 of 8, by rmay635703

Posted on 
User metadata
Rank Oldbie
Rank
Oldbie
debs3759 wrote on 2020-11-03, 14:05:

The manual pages you posted don't show settings for a 5x86. Are you sure it's supported?

Others own your board even have bios updates

I would ask them and see if they have any ideas

MSI MS-4144 ver 2.1 manual and BIOS help

Reply 8 of 8, by srmeister

Posted on 
User metadata
Rank Newbie
Rank
Newbie

i just desoldered the 10 pin receptacle JC3 and tried to use it as the 0-Ohm resistor array in JC1 , so i connected all pins on the top side. Then the PC didnt boot. So i reconnected all the pins pairwise (pin 1&2, 3&4, and so on..) which worked. The picture below shows the wrong configuration. Fortunately nothing blew up.
in place of JC3 i soldered a 6x1 pin header and put 3 jumpers on it, like in the picture from mpe 2 posts above.

everything works fine now, thanks again for the help.

Stefan

Attachments

Go to top of page Go to top of page
Back to General Old Hardware
Close window
Close window