FMan wrote:
No need to be nasty. What about my other questions?
I didn't mean to be nasty. I'd just like to keep this discussion technical, or at least informational.

FMan wrote:
With 4 MB FlashROM and 32 MB SDRAM, this cart easily kicks MMC Replay in that department, but is it compatible with anything? I mean, is how much of the ROM available for custom features?
Actually the amount of FlashROM on the final version is reduced to 2MB, since it is not needed to have that amount. Basically, anything you need, you can just store it on the SD-card, which is even easier to update. The actual application can even start from SD-card without flashing! The 2MB can still be used though to store different versions of the application, like with different cartridge emulations. The application is around 250-300 kB, so there is still plenty of space left.
About compatibility: it is HIGHLY compatible with a 1541!
FMan wrote:
It would be very interesting to see more detailed specifications and possibly some register maps or operation description, even if subject to change. The coolest feature has to be "emulated drive sounds".

There are no accessible registers from the C64 side. Documentation still has to be written from scratch! (There are just some notes here and there..) First I need to get the units produced (I'm about to!) and then I could spend some time on documenting the internals of the Ultimate. Around halfway this year, I am planning to make it open source, including the documentation.