.text

.macro MOVIA reg, addr
  movhi \reg, %hi(\addr)
  ori \reg, \reg, %lo(\addr)
.endm

#defineconstants
.equ Switches, 0x00011010
.equ Trigger,  0x00011000
.equ Accumulator, 0x00011020
.equ zero, 0x00000000
.equ one, 0x00000001

#Define the main program
.global main
main:
  movia r2, Switches
  movia r3, Trigger
  movia r4, Accumulator
  movia r8, zero
  movia r9, one
  initd 0(r5)

Main_loop:
    Check0_loop:
        and r10, r3, r9
        beq r10, r8, Check1_loop
        br Check0_loop
    Check1_loop:
        and r10, r3, r9
        beq r10, r9, end_loop
        br Check1_loop
    end_loop:
        ldbio r6, 0(r2)
        add r5, r5, r6
        stbio r4, 0(r5)
        br Main_loop

END:
 br END /* Wait here once the program has completed */
.end