MASSEY Machine Code Instructions: Loading, ORing, Adding, and Conditional Jumping

a)

'LD R0, #23' 'ST R0, [address]'

b)

'OR R8, R9' 'ST R8, [address]'

c)

'LD R0, [address1]' 'LD R1, [address2]' 'ADD R2, R0, R1' 'ST R2, [address3]'

d)

'LD R5, [address]' 'CMP R5, #6' 'JEQ 13'