Small PCB breakoutboard for arduino SPI connector. Acts as programmerboard on top of SPI connector (tested with Arduino Nano as SPI). SPI female connector soldered on bottom side of board. Accepts AT_Tiny 25/45/85 OR ATMEGA328P (16 Mhz external clock). Make sure the sketch uses SPI connetor pins SCK/MISO/MOSI 2PCB versions. v2.1 regular etched pcb (not tested) v2.2 predrilled board with copper strips (3 hole islands.) (TESTED) Take Care!! some pins in the 28 pin chip socket have been removed to make room for routing!! Some pins are not used and have been removed to make inserting and removing the Atmega 328P less stressfull on the chip pins. Crystal and C4 sit inbetween IC socket pins. p.s. Arduino's do not need to be inserted fully. Just apply light pressure while uploading sketch.