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No, no; the thing that you noticed is only a special thing about how the memory controller on the VSA100 works. In simple words, it does a 128bit acces to the RAM, but divided in half; first 64bits (half of the total amount of chips) are assigned to the "A" port and the last 64bits are assigned to the "B" port. Do not be confused though, there are not 2 independent memory controllers, but 2 units for multiplexed datas (data input and output to and from the video RAM).

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Thanks Radu for your kind words, allthough there was not anything special there; Hank Semenek had published the points for A11 adresses on a Voodoo5 5500 AGP a long time ago; unfortunately he had not marked the chip-select pins too; I saw no research done for the Voodoo4 PCI PCB, so I shared my results; it could be of some help.
I guess it would not be wrong to let the other members here know that we (me and Radu) talk for some time now about teaming up to do future 3DFX modding. Radu offered to sacrifice his only Voodoo5 5500 AGP as a test platform for my work. I want to thank him here! As we talked in private, I will be happy to accept for him to send me the V5 as soon as we find the new RAM chips; no point to send it to me sooner, because allthough we both searched in our homme-towns, we have not found 2xGeForce2 cards with 64Mb SDRAM, 128bits, 8 chips for each one. If we proceed to do the mod, we will share the results on this forum.

Now... I am not sure what are you asking... If you talk about the compatible memory chips, but with double the density, there are no confirmed donor video cards models; at least none that I know about. There is a router and also a HDD that are known to use 16Mb RAM TSOP2-86 modules onto theyr PCBs, and we have M14Radu to thank for the infos; and there is a real chance that a no-name low-profile PCI Quadro card might also use the desired memory chips, but so far all this path looks like a dead-end.
If you want an example of a brand/model of compatible 16Mb TSOP2-86 SDRAM modules, there are manufacturers that advertised the production of such items, like the K4S283232E-T from Samsung. Good luck if you think that you could be able to buy a dozen or two of them.
In an effort to bypass the limitation of geting this kind of rare RAM chips, M14Radu and myself have started a project to try to use non-compatible memory modules for the "transplant". All the technical details are above on the topic. We allready have all the RAM chips that we need for the modding of a single prototype Voodoo5 5500, but the thing that we do not have is alot of time to work on it...

The RAM chips on Voodoo4/5 SDRAM cards are of TSOP2-86 standard, that is each memory module has 86 pins.
VDS6616A4A and HY57V281620HCT chips are of TSOP2-54 standard, that is each memory module has 54 pins.
So, no, they are not compatible, unfortunately; it would be like a try to plug an Intel LGA775 CPU onto a AMD 939 socket, he-he...

Well,

I did some more searching, and found another site. I actually got a message from them, stating that one of their suppliers would contact me, which I ofcourse haven't had yet.

I requested info about the ram you mentioned, the K4S283232E-T

let's hope they do contact me.

@ Jandarsun8

There was something like this thread posted @ http://www.3dfxzone.it/enboard/default.asp
and the result was a real no go, even that a Voodoo 5 5000 AGP x4 as 5500 AGP AGP x4 as 5500 AGP x4 for Macintosh have the AGP x4 connector, they will only opperate in AGP x2 / 3.3volt modes it´s because of the 3dfrx SLI interfering with the AGP x4 signals as that safety thing.

uhm the 5000 as 5500 don´t have bridge chips only 6000´s have them:
http://www.3dfx.ch/gallery/v/3dfx_collectors/collectors_obiwankenobi/album85/3df...

_{stupid spannish Win98SE rigs here are so ghey they don´t even let you post normal pics as so unstable grrrr, when they lockup you money counter keeps on going lol pay´n for the d*mn crashes}

Nice news Pastor,
It seems to be the right memory 

everyone who is interested please contact me per PN:

I have to know how many chips you want and how you want to pay and where to ship and and and... 

but it needs some time to look at all the inquiries ...
and I am a human, too, so I need (at least a bit) time

@gtxe : one chip costs 3,8€

procedure: i order ... i get the chips ... you send me the money ... than i will send the chips to you ...
or you pay for the number of chips you want and than when i get them i will send them to you ...

i know its difficult but its my money too



Pastor