CM — clear and add magnitude
CM x
Clear AC and BR, then obtain contents of SAM(+1, 0, -1) times 2-15 and add magnitude of contents of memory[x], storing result in AC. The magnitude of contents of memory[x] appears in AR. SAM is cleared. Overflow may occur giving an arithmetic check alarm if |C(mem[x]) + C(SAM) 2-15| = 1.
CM | 10100 xxxxxxxxxxx |