The ISA was likely designed for efficient implementation in Silicon rather than being easy to grok by a human. To see what I mean, have a gander at this: http

The ISA was likely designed for efficient implementation in Silicon rather than being easy to grok by a human. To see what I mean, have a gander at this: https://github.com/ulx3s/apple2fpga/blob/master/cpu6502.vhd https://github.com/ulx3s/apple2fpga/blob/master/cpu6502.vhd