Wanting to start sizecoding on a Motorola 68k platform in this day and age can be tough.
So here is a bit of help to get you started:
The Motorola 68k processor
The Motorola 68k processor...
Note: Assigment direction is source,dest instead of dest,source !!!
D0..D7 - 8 x 32 bit General Purpose Registers
A0..A6 - 7 x 32 bit Address Registers
A7 - 32-bit Stack-Address Register
The number of cycles for each instruction is different depending of processor model in M68K family.