You can easily use a PC's printer port for serial-EEPROM programming. You can use a device-programmer circuit used to program the MicroWire serial EE-PROM 93CXX (Figure 1). The circuit is so simple ...
The circuit of AVR In-System-Programmer (ISP) has been modified to function with USB connection to a PC. The modification of the old AVR ISP includes the replacement of two transistors which will be ...