Easy to make programmer using 12V DC-DC converter with enable and ATMEGA32U4 Beetle board. Programs AVR Attiny devices in high voltage mode to recover fuse settings and allow reset pin to be used as ...

The firmware for my original programmer, the Big Mess o' Wires programmer, and the CayMac Vintage revision 1 programmer. These programmers use the Atmel/Microchip AT90USB646/1286 AVR microcontroller.