Help needed, 486 motherboard, L2 cache detected but not working \ VOGONS

Help needed, 486 motherboard, L2 cache detected but not working

Topic actions

Post a reply

First post, by CachoAlpuy

Posted on 2022-11-10, 12:23

CachoAlpuy Offline

Rank Newbie

Rank: Newbie
Posts: 67
Joined: 2020-01-16, 20:31

Hi, i have the motherboard DTK PKM-0033S with SIS 496/467 chipset and currently with 128kB of cache and Intel 486 DX2 66 CPU.
The board detects the cache as it is shown in the initial screen before loading DOS but it doesnt seem to work according to some tests in SpeedSys and CacheChk.
I double checked the jumpers and they are ok, the cache is formed by 5 chips of 32Kx8, 4 for the cache and 1 for the tag.

In the bios i tried with all the settings and nothing works.

Does anyone know what can i do to make it work?

URL of the motherboard information:
https://theretroweb.com/motherboards/s/dtk-pkm-0033s

Attachments

Filename

bios486.jpg

File size

57 KiB

Views

423 views

File license

Public domain

Reply 1 of 5, by majestyk

Posted on 2022-11-10, 14:52

majestyk Offline

Rank Oldbie

Rank: Oldbie
Posts: 1365
Joined: 2020-12-04, 09:13

Try with a 16Kx8 TAG chip like in the blurry picture at theretroweb.

Reply 2 of 5, by pancakepuppy

Posted on 2022-11-10, 18:17

pancakepuppy Offline

Rank Newbie

Rank: Newbie
Posts: 91
Joined: 2019-12-26, 06:30
Location: NW USA

Can you post your cachechk results?

Reply 3 of 5, by mkarcher

Posted on 2022-11-10, 22:31

mkarcher Offline

Rank l33t

Rank: l33t
Posts: 2649
Joined: 2019-01-19, 16:29
Location: Germany

We just recently had a very similar thread on VOGONs. The final result was that the CPU jumpering was wrong. Double-check the CPU type jumpers. On SiS496 boards, there usually are a lot of jumpers to be set according to the CPU type...

Reply 4 of 5, by amadeus777999

Posted on 2022-11-11, 10:13

amadeus777999 Offline

Rank Oldbie

Rank: Oldbie
Posts: 970
Joined: 2013-07-04, 17:04

A 32Kx8 chip as the tag ram should work - as already said, recheck the jumper settings.

Reply 5 of 5, by CachoAlpuy

Posted on 2022-11-11, 11:35

CachoAlpuy Offline

Rank Newbie

Rank: Newbie
Posts: 67
Joined: 2020-01-16, 20:31

It turns out that the 32Kx8 wasnt working as the tag ram, i now put a 16Kx8 in the tag slot, it was swapped with one of the cache rams.
Also the tag chip was 12ns instead of 15ns.

It works now.

Go to top of page Go to top of page

Back to General Old Hardware

Main menu

Common searches