![]() This CPU is 8-bit, it has 2 general purpose registers r0 and r1, a 8 bit Arithmetic logic unit (ALU) capable of doing XOR and ADD operations, an Instruction Register (IR), an Argument Register (AR) to store instruction arguments and a Control Unit (CU) to handle data flow. ![]() Logisim is an educational tool for designing and simulating digital logic circuits, its development has ceased since October 2014, but it is quite feature complete and still usable in 2018. The CPU is called XYT-CPU, named after the initials of the project members. Although the CPU project is old and other better designs certainly exist, I still feel that this project’s structure organisation and its bundled assembler have some educational merits. The goal is to create a CPU in Logisim using none other than the primitive logic gates. This is an old course project I did at McGill for COMP 273 – Computer System.
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