A SI5351A based PLL with the option to add a TCXO

image-to-gcode for windows and linux without linuxcnc

Three old projects for PC/MS-DOS I made: SD card driver for the parallel port, NE2000 packet driver for 8-bit slot, and a screensaver

Layout of WA2EBY amplifier in Kicad, licensed CC-BY-SA 4.0

ESP8266/ESP32/Arduino custom modem<->internet simulator with lots of features

A header-only C library to allow access to SPI PSRAM via PIO on the RP2040 microcontroller.

An Raspberry Pi Pico2 RP2350A-based ROM emulator(including clock, reset, and UART-USB)

24 channel, 100Msps logic analyzer hardware and software

Experimenting with LPC controllers and LPC-ISA bridges.

Tiny business card size scientific RPN calculator with watch made by yourself. Several firmware options are available including the emulator of the famous HP-35.

The replacement board for the AY-3-8910/AY-3-8912/YM2149F sound chip. Compatible with https://www.avray.ru project firmware.

How to create an OS from scratch

A new operating system from scratch!

FM sound source written in Verilog, fully compatible with YM2612 (JT12), YM3438, YM2203 (JT03) and YM2610 (JT10)

An atomic parts library for Ki-Cad.

S-100 ATX Motherboard for PC Cases

USB-Blaster firmware that runs on cheap with CH552G chip

Definition of the "LumaCode" signal standard with reference implementation

KiCad library of Pro Micro

Faxitron DX-50 x-ray utilities

REX for TRS-80 Model 100, 102, 200

Code base for Guru6809 computer

GuruModem Design Files

a force sensitive morse paddle key

Eases development of serverless Discord app and bots, for science.

A simple JTAG programming and test board for ATF1502 / ATF1504 CPLDs

SCSI2IDE Firmware

The hacktic demon dialer, from 1991

Convert sound samples into DCT's and output as midi notes.