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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

Instead of making FIVE different dongles for C64 diagnostics, I'm just going to make ONE

Commodore 64 Diagnostic Dongle

View all 10 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 Yann Guidon / YGDES

Projects I Like & Follow

The 2017 Hackaday Prize

Just because! A home computer without microprocessor

Gigatron TTL microcomputer

marcel-van-kervinck 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 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 Alastair Hewitt

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 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?

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

One Bit CPUs

agpcooper agp.cooper

Hackaday Prize 2020

Test any electronic component with this pocket component tester

Component Tester in a Keychain

akshay-baweja Akshay Baweja

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

SMD Component Magazines

robin-reiter Robin Reiter

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

Building a Drop-In Replacement for the MOS6526. Sponsored by PCBWay

74HCT6526

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 Steven Stallion

2021 Hackaday Prize

Inspired by the shell-swapping hermit crab, HERMITS uses interchangeable mechanical shells for tiny robots to do all sorts of things.

HERMITS

ken-nakagaki Ken Nakagaki

View all

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