Abstract
The design and development of 16-bit Medium Instruction Set Computer (A-MISC) covering the performance of Complex Instruction Set Computers (CISC) and Reduced Instruction Set Computers (RISC) is proposed here. The instruction set of the proposed A-MISC computer includes Memory Reference Instructions with direct, indirect and immediate addressing features, Register Reference instructions dealing operations within the registers of the CPU, I reference instructions concerning the peripherals, Stack instructions controlling the stack and some other miscellaneous instructions. To have a reduced complexity for the hardware the data word size is set as a standard of 16 bits. The lengths of instructions are of either one word or 2 words depending upon the category of instructions. The address of the memory is denoted by 24 bits resulting in physical memory capacity or 16M words for the computer. Most essential flags available in the CISC computers are included in the A-MISC. The control unit is designed on hardwired concept. For the time being the programs for A-MISC are written in symbolic assembly program. The Assembler package for this computer is developed with Borland C and it would run two passes. Sample programs are run on the computer and the performance of the computer is estimated.