6303 speed note

The speedup the 6303 provides over the 6803 will probably be smaller than the 6309 vs 6809.  Several of the 6803 opcodes were a clock cycle faster than the 6809 to begin with, and many opcodes aren't any faster at all.  But somewhere between 10% and 20% would still be pretty significant, especially when that is combined with the new ROM.