Congrats on the working upgrade and thank you for the feedback! 😃👍

Yay. Good work, If there were good datasheet on these chips, this would been answered quickly.

Cheers,

Bump after almost 3 years.
I've found a Tseng Labs ET6000 it uses those memories:
MD908 ASJ-5-120
I installed the MD908 SJ-5-100 and they are correctly detected.
I suppose the ASJ variant may work fine with both AJ and SJ, even the different rated speed doesn't seem a problem.

I also update with some background informations, I can't remember if I posted the result in some other topic.
The et6000 is usually clocked at 91,87 mhz. I had 3 of them with the same clock, they can use mdram rated for 120ns or 100ns. There are cheaper models 2 mdram modules and no sockets to upgrade this one was clocked at 90,68 mhz.
The et6100 I have is clocked at 97,16 mhz. It uses 100 ns memories.

I tried to overclock them with mclkinfo. This great utility allows to change the clock and the ram timings on those cards. I have been able to overclock the et6000 to 100,23 mhz, they both ran fine the 120ns and the 100ns. I did the same with the ET6100, to be precise to 100,25mhz.
The difference between ET6000 and ET6100 are prestation wise non existant. At their default speed (91 mhz vs 97) the most noticeable differences were in doom where the did 633 ticks while the et6100 did 615 ticks.
When both were overclocked the difference was down to 3 ticks (less) for the et6100.
Less ticks = more fps.