Matrox MGA G450 Dual Head does not work on Lucky Star LS-486E (SIS 85C496-7) \ VOGONS

Matrox MGA G450 Dual Head does not work on Lucky Star LS-486E (SIS 85C496-7)

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First post, by fsinan

Posted on 2024-05-24, 19:05

fsinan Offline

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Rank: Newbie
Posts: 91
Joined: 2024-01-09, 19:35

Matrox MGA G450 Dual Head does not work on Lucky Star LS-486E (SIS 85C496-7). No video, card is PCI 2.1 as far as I know, but the mobo supports PCI 2.0.

Is it normal?

System:1
Cyrix 5x86-100GP
Lucky Star LS-486E
System:2
AMD K6-2-475(Changing frequently with Cyrix 6x86MX PR-233)
Asus P5A-B
System:3
UMC U5S-40
486UL-P101
System:4
P3 Coppermine 800EB
Gigabyte GA-6BX7

Reply 1 of 1, by mkarcher

Posted on 2024-05-24, 19:30

mkarcher Offline

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Posts: 2701
Joined: 2019-01-19, 16:29
Location: Germany

I don't know whether I've seen that card working on a SiS 496 yet, but I know a system based on the UM8881 with that card. It works fine at PCI@33MHz, it refuses to correctly intialize at PCI@20MHz, and requires a heatsink on the HiNT/PLX bridge chip at PCI@40MHz. On the UMC chipset, the PCI/FSB divider is software configured, but AFAIK on the SiS boards, it's hardware only. So make sure you don't run FSB40 with PCI at FSB/2, by jumpering the PCI/FSB division option to 1:1. On the UMC chipset, I had to patch the BIOS to not use 1:2 during POST at FSB40.

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