I've been considering changing to a 68010 for my A500 as well. This is what I have found out in my research (IIRC):
The 68010 is pin compatible with 68000 so it's only to swap.
MOVE from SR is not allowed on 68010 since it is a protected/supervisor instruction, which is it not on 68k. I do not know how much of an issue this is. Some people say it doesn't matter, some say it might cause problems.
The P number on the IC is the maximum clock frequency it can run at. So P10 it 10MHz and P12 is 12MHz and so on. The A500 CPU is clocked at 7.XXXMHZ so go for the P10 if it's cheaper.
In general there will be a performance increase of about 5-10% with a 010 compared to a 68k at the same clock frequency.
This is what I have understood my my research regarding 68010. I haven't changed the CPU myself (maybe I will). If this information is not correct, can someone please correct me?
