The instruction set implicitly subdivides the data format into the same fields as type A instructions: prefix, decrement, tag and address. Instructions exist to modify each of these fields in a data word without changing the remainder of the word, though the Store Tag instruction was not implemented on the IBM 704.
The instruction set implicitly subdivides the data format into the same fields as type A instructions prefix decrement tag and address Instructions exist to modify each of these fields in a data word without changing the remainder of the word though the Store Tag instruction was not implemented on the IBM 704