Do you have tried all the images ?
If yes i think that we have tried all we can do for the moment.
I really need to have an S950 to figure out what is the problem. It seems that there are an electrical/logical level compatibility problem, but this very hard to understand/solve it through a forum mail. Probably that the data lines is not the only signal to patch...
There still something to try, but this need to modify a little the S950. The modification will force the FDC of the S950 to work at the low bitrate (250kbits/s). By this way you will be able to read akai_s950_1_01.hfe
Anyway i will understand if you don't want to do the modification.
Another interesting to do is to try an USB HxC Floppy Emulator. This hardware has a different bus driver circuit and may work without any problem. If you are interested, i will see with Lotharek to send you one device to test (you need a PC as server to use this emulator).
Yes, I believe I have tried all the images, with all 3 chips but I will try again later just to be sure.
Should all the images that you sent me contain data/samples or are any of them simply blank disk images?
Should I be checking the files & chips with the latest firmware that you issued me?