The AN / GYK-12 had a 32-bit instruction format and operated on data from one bit to a doubleword ( 64 bits ) in size.
12.
To circumvent this problem, many machines, particularly the ACE and its descendants, included in their instruction format a field specifying the address of the next instruction to be executed.
13.
The PEs had instruction formats for 64, 32 and 8-bit data, and could be placed into a 32-bit mode that made it appear that there were 128 PEs.
14.
For example, the x86's " double-wide cas " requires a special instruction format to specify multiple registers, performs several reads and writes, and can have complex bus operation.
15.
The small number of CPU instructions, as well as other instruction set features & mdash; fixed instruction length and only three different types of instruction formats & mdash; greatly simplify instruction decoding and processing.
16.
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17.
The instruction format defined for the AN / USQ-17 marked the beginning of an instruction set which would be carried on, with many changes along the way, into later UNIVAC computers including the UNIVAC 1100 / 2200 series which is still in use.
18.
In particular, the design was to include a number of subsystems for input / output, a binary-coded decimal converter, floating-point hardware including a square root function, a number of loop instructions and index registers to support them, and used a complex three-address instruction format.
19.
The instruction format was 6-3-15 : six bits for the operation code, three bits for a " designator " ( index register for memory access instructions, condition for jump ( branch ) instructions ) and fifteen bits for a memory address ( or shift count, for shift instructions ).
