Content for 74LS283


These full adders perform the addition of two 4-bit binary numbers. The sum (∑) outputs are provided for each bit and the resultant carry (C4) is obtained from the fourth bit. These adders feature full internal look ahead across all four bits. This provides the system designer with partial lookahead performance at the economy and reduced package count of a ripple-carry implementation. The adder logic, including the carry, is implemented in its true form meaning that the end-around carry can be accomplished without the need for logic or level inversion.

Project  MikroLeo


“MikroLeo project files (schematic, PCB, assembler, emulator/debugger, circuit simulation file, documentation, example of programs etc). MikroLeo is a 4-bit microcomputer developed mainly for educational purposes and distributed for free under open-source licenses. 4-bit Didactic Microcomputer The project is in …

SAP-1 Processor Architecture

“A simple 8-bit micro-processor using mostly discrete logic chips. This project is mostly based on the 8-bit Breadboard computer by Ben Eater Banner Specs ~400 Hz Clock 8-bit Data Bus 16-bit Control Word 5 Microsteps per Instruction 16 byte RAM …

Build an 8-bit computer from scratch

“I built a programmable 8-bit computer from scratch on breadboards using only simple logic gates. I documented the whole project in a series of YouTube videos and on this web site. “