And the 8086 (on up), the 68000 family, and the VAX also had BCD instructions. When I wrote my own 6809 emulator [1] the DAA instruction was the hardest one to

And the 8086 (on up), the 68000 family, and the VAX also had BCD instructions. When I wrote my own 6809 emulator [1] the DAA instruction was the hardest one to get right [2] [1] https://github.com/spc476/mc6809 https://github.com/spc476/mc6809 [2] Specifically the condition code results.