Content for 74LS157


The LSTTL/MSI SN54/74LS157 is a high speed Quad 2-Input Multiplexer. Four bits of data from two sources can be selected using the common Select and Enable inputs. The four buffered outputs present the selected data in the true (non-inverted) form. The LS157 can also be used to generate any four of the 16 different functions of two variables. The LS157 is fabricated with the Schottky barrier diode process for high speed and is completely compatible with all Motorola TTL families.

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 …

Vectron VGA Plus v2

“Vectron VGA Plus v2 generates a 640x480@60Hz VGA signal and has an interface that works with retro computers or Arduino. How It Works Vectron VGA Plus v2 is an improvement on the earlier design. The key to the simplified …

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 …

SPEBEG (Single Player Eight Bit Electronic Game)

“Finally got around to finishing the last details of an old shcool project. A simple 8bit game, aim with the joystick at the target and fire! Increase points and try to keep up with the increasing speed!”

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. “