Disclosed is a technology of converting a first assembly language program implementable on a first processor to a second assembly language program implementable on another processor. The two assembly language programs are described using same instructions. A unique address in the first assembly language program is assigned to a first number of bytes, and a unique address in the second assembly language program is assigned to a second number of byte numbers. The first number is larger than the second number. The first assembly language program is read from a storage. Thereafter, one or more address descriptions of the first assembly language program are translated to another one or more address descriptions using a ratio of the first number to the second number so that the first assembly language program is implementable on the second processor, wherein the ratio is 2 or a positive integer more than 2.