Abstract: An assembler system enables efficient usage of space in a read only memory (ROM) that permits multiway instruction branching. Source code is analyzed and assembled by the assembler system and the assembler system then efficiently places the instructions in the ROM. The source code includes at least the following elements or an equivalent counterpart thereof: next state statements, nonaligned instructions, align statements, and aligned instructions. Next state statements serve as a flag to separate the various instructions. Nonaligned instructions are defined as those instructions that are nonaddressable by other instructions, i.e., those instructions that are not branched to. Align statements serve as a flag to the assembler system that a plurality k (where k is equal to 2.sup.n and where n is a positive integer) of aligned instructions directly follow in succession. Furthermore, aligned instructions are defined as those that are addressable by a plurality of other instructions, i.e.