Resetting or clearing a regular storage register is accomplished by a coding that is a departure from the usual scheme of “out” and “in.” The instruction
- Clear register 321;
- read the next coding line
is coded:
321, 321, 7
Similarly, you can clear any other regular storage register if you repeat its code in the out-and in-fields. However, a few of the storage registers in the machine have special reset codes, and these may occur in any of the three fields A, B, C.
As the result of a recent modification of the machine, you can easily double the number in any storage register. For example, the instruction
- Double the number in register 321;
- read the next coding line
is coded:
321, 321, 743