A bit late but here is the serial number of my ST:
0KNMB06664
666... the Turbo-R from hell! 
Most opcodes supposedly new are the undocumented z80 opcodes. So best code on like you did with the z80. Which is probably why the new r800 style mnemonics haven't caught on. 
All the gain is in the non-specific opcodes. The only useful r800 only opcodes are mulub/muluw and I doubt they would give you a speed-up of 6-8 times.
If you take a look at the different z80 timings and r800 i can say that the r800 ones seem that they need less t states which would mean that it is an improvement after the z80 right?
All the gain is in the non-specific opcodes. The only useful r800 only opcodes are mulub/muluw and I doubt they would give you a speed-up of 6-8 times.
If you take a look at the different z80 timings and r800 i can say that the r800 ones seem that they need less t states which would mean that it is an improvement after the z80 right?
True. But the z80 code on R800 is not 6-8 times faster. But still 2 a 3 times faster as far as I could see on my projects. 2 times faster is still a good improvement though.
Huey> I suspect you're running a ROM then. With 3 cycles delay per memory read, you'd be limited to about 2/3 times. Now try it from internal memory. 