The assembly instruction implemented at the OS4 level is: Select one: a. RETTR b. No answer is correct c. DECI d. ADDSP An assembler translates from the Asmb5 level to: Select one: a. Operating system level b. Microcode level c. No answer is correct d. Instruction set architecture level Solution The assembly instruction implemented at the OS4 level is: Answer) c. DECI ( Decimal Input trap) instructions available at assembly language level even though they are not (directly) available at the machine language level. In order to Represent operations handled by the operating system includes NOPn: unary no operation trap NOP: non-unary NOP DECI: decimal input trap DECO: decimal output trap STRO: string output trap An assembler translates from the Asmb5 level to Answer ) option a. Operating system level The assembly language level is an intermediate step between high order language and the machine language of a particular processor.Programs at the HOL6 level are usually compiled to level Asmb5 , then translated(assembled) to machine language.source code can be written in assembly language.