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Justin Davis

ph.d. electrical engineer - embedded systems developer

Toledo, Ohio

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This user joined on 09/28/2015.

My Projects

A very small fully-functional interface for an Arduino Due emulating an Altair 8800

Altair 8800 front panel Ardiuno shield

A breadboard-able computer which uses only a single instruction - MOVE

One-instruction TTL Computer

Microcomputer that runs without a CPU

GTXL Gigatron clone computer with keyboard

Connecting a floppy drive emulator (Gotek) to the Atari ST with a few small adapter boards.

Atari ST Floppy Drive Emulator Adapters

Incorporates an improved minimal-chip One Instruction CPU with a hardware-driven VGA output

One instruction VGA computer

The 2017 Hackaday Prize

Simulating the functionality of memristors using off-the-shelf parts to form a neural network crossbar array

Memristor Simulator for a Neural Network

View all 9 projects

Projects I Contribute To

Let's solve this badge! Join this team to share and discuss the DEF CON 26 Badge

DEF CON 26 Official Badge Hacking

Where DIY DIP/SSI/MSI CPU makers meet and discuss other TLA (three letters acronyms)

Hackaday TTLers

Yann Guidon / YGDES

Projects I Like & Follow

The 2017 Hackaday Prize

Just because! A home computer without microprocessor

Gigatron TTL microcomputer

Marcel van Kervinck

The 2017 Hackaday Prize

RepRap HELIOS is a highly printable SCARA 3D printer. It has an outrageous print area and can print on almost any flat surface.

RepRap HELIOS

Nicholas Seward

Hackaday Prize 2019

Retrocomputer built from TTL logic running CP/M with no CPU or ALU

Novasaur CP/M TTL Retrocomputer

Alastair Hewitt

Science in your hand. A pocket-sized instrument capable of visualizing and exploring the world around you. (Iteration 8)

Iteration 8

The 2017 Hackaday Prize

This project describes the use of Raspberry Pi as an IoT connected vital signs monitor. The HealthyPi HAT for Raspberry Pi used.

Connected Health: Open source IoT patient monitor

Ashwin K Whitchurch

Hackaday Prize 2019

A microprocessor built with TTL chips. In one square inch.

1 Square Inch TTL CPU

How many TTL ICs do you actually need to output a VGA image?

World's Simplest TTL VGA circuit?

3D Print yourself some of these magazines to keep your shop organized and boost your pick and place productivity!

SMD Component Magazines

Hackaday Prize 2020

Test any electronic component with this pocket component tester

Component Tester in a Keychain

The 2017 Hackaday Prize

A discrete-logic CPU that fits on a prototype board, and is able to run complex C programs, all without microcode.

Microcode-less TTL CPU

I have been exploring one bit CPUs. For the right application they may be worth knowing.

One Bit CPUs

A 16-bit CPU, with 16 registers, described in 66 lines of code - with HDL, emulators and a macro assembler.

OPC-5 - a CPU for FPGA, in one page

A DIY true single-chip computer with video and C interpreter

ELLO 1A

I've made a custom Magnetic Rotary Encoder using an AS5048A

Magnetic Rotary Encoder

Chris G Chris G

Bringing a vintage DIY binary counting computer back to life

Restoring the TRANSBINIAC computer

A flexible, configurable video circuit for homebrew computers, with shared RAM access and easily-tunable timings

Configurable video output for 6502 computers

An addressable LED based on discrete transistors

The TransistorPixel

16-Bit TTL Compatible I/O Expander for the PiDP-11 and Raspberry Pi

PiDP-11 I/O Expander

Steven Stallion

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Bits

roelh wrote 10/18/2019 at 06:59

Hi Justin, thank you for following the #1 Square Inch TTL CPU ! however, that project was completed, and action is now at #Kobold K2 - RISC TTL Computer.

Are you sure? yes | no

Ed S wrote 07/20/2017 at 06:18

Thanks for liking our #OPC-5 - a CPU for FPGA, in one page project!

Are you sure? yes | no