Since we have direct access to registers via name by "cpu->a" and the
like. Use that notation in a few more places since it is far more concise.
Signed-off-by: Max Regan <mgregan2@gmail.com>
The HL dereference operations cause problems indexing into the
registers array, because it causes a hole in the array that only
exists in the 8-bit register space.
Instead of accessing the registers directly by the same indices used
in in the assembly instructions, create a lookup table to map between
them.
Signed-off-by: Max Regan <mgregan2@gmail.com>
