I'm surprised that the 6809 MUL instruction seems to have a fixed execution time (11 cycles, if I am interpreting the specs correctly). This implies to me that

I'm surprised that the 6809 MUL instruction seems to have a fixed execution time (11 cycles, if I am interpreting the specs correctly). This implies to me that it might be heavily based on look-up tables, yet the 6809 surely had very limited die space for that