Sums the contents of source register Rs5 and accumulator,
then loads it back into AGU accumulator register. Rs is
accessed via port 5 and it's register bank is selected by
BS5.
Takes 3 cycles to execute.
Example: AGU_RA ZERO 0xA5
AGU P5
------
- A5
- 00
RA 00
NOT YET
AGU_RA ZERO 0x20
!! Sums the contents of registers
!! 0x20 and accumulator and loads
!! the result back to accumulator
!! register.