Content for 74HCT138

74HCT138

The 74HCT138 is a high speed CMOS device that is designed to be pin compatable with 74LS low power Schottky types. The device accepts a three bit binary weighted address on input pins A0, A1 and A2 and when enabled will produce one active low output with the remaing seven being high.

Pineapple ONE

“32 bit RISC-V homemade In this article I will describe how I designed and made a functional 32 bit RISC-V CPU at home. Specifications: “Max” clock speed: 500 kHz Program memory: 512 kB RAM size: 512 kB VGA …

CSCvon8: 8-bit von Neumann Crazy Small CPU

“This repository holds the files for my 8-bit “big brother” CPU to the 4-bit Crazy Small CPU. This is a von Neumann style CPU designed with 7400-style logic chips and some RAM and ROM. The CPU requires only seventeen chips …

6502 retro controller board

“Classic CPU as an “Arduino style” microcontroller An attempt to create “Adruino inspired” set of modular boards, containing thirty years old parts - primarily vintage 6502 microprocessor. About one year ago I noticed that some sellers on popular Chinese auction site …

Project  Z80-Board

Z80-Board

“A Z80 computer wirewrapped on perfboard. The wirewrapping technique uses standard IC sockets and PCB header pins, so the components and wiring are on the same side of the board; this has many benefits: It’s easier to see what …