VOGONS


First post, by muon

User metadata
Rank Member
Rank
Member

Hi! I have got this ET4000 card: VG-5600 model. This board only support 256 colors because it has a 476-80 RAM-DAC and it only supports that amount the colors.

s-l1600.jpg

In the manual says there is another model (VG-5600H) with support for 32K/64K colors because it has a different RAM DAC (SC11487CN). is it possible to change the ICs (476-80 to SC11487CN)for getting 32/64K colors?

ET4000.jpg

Does anybody done something similar? Any problems with the VGA BIOS?

Thanks in advanced

Reply 1 of 5, by dionb

User metadata
Rank l33t++
Rank
l33t++

The DAC is socketed, so it should be easy enough to try if you can find the correct chip. You might need a different BIOS too, which is technically simple (if you have spare EEPROMs to flash) but could be exceedingly hard to find...

Reply 3 of 5, by BloodyCactus

User metadata
Rank Oldbie
Rank
Oldbie

pinout on the 28pin dip is the same with SC11487CN and KDA0476, in theory, should work!

--/\-[ Stu : Bloody Cactus :: [ https://bloodycactus.com :: http://kråketær.com ]-/\--

Reply 5 of 5, by dionb

User metadata
Rank l33t++
Rank
l33t++

Back in the ISA days, VGA BIOSs were pretty simple affairs. It might be worth looking if you can find the BIOS of another ET4000AX-based card with SC11487CN and try that. No guarantees, but better than nothing if you can't find that 5600H BIOS.