IBM 702/705/7080 Programmers Model

The 702 was designed to be the business counterpart to the 704. The 705 was the upgrade to the 702, but it was not 100% source compatable. The machines had two accumulators that were 256 characters (512 for the 702) long and in a ring structure. On the 702 the accumulators were identical. On the 705 and 7080 accumulator B was divided into 15 sections. All instructions were 5 characters long, one character opcode and 4 character address.

The operations were as follows: