FWIW, the Z80 has a 4-bit ALU, despite registers and databus being 8 bits wide: https://www.righto.com/2013/09/the-z-80-has-4-bit-alu-heres-how-it.html https:/

FWIW, the Z80 has a 4-bit ALU, despite registers and databus being 8 bits wide: https://www.righto.com/2013/09/the-z-80-has-4-bit-alu-heres-how-it.html https://www.righto.com/2013/09/the-z-80-has-4-bit-alu-heres-...