Some of our small projects need embedded micro control circuits, so we decided to get familiar with AVR.
To start AVR development, it is necessary to prepare AVR ISP programmer and JTAG simulator. So it’s made now (not willing to buy high priced ready-made). Buy back all kinds of components, release all kinds of AVR programmer data stored in the old computer, and decide to make a USBASP and a jtagice emulator. However, before that, you need to make a serial port ISP burning software to burn firmware for USBASP and jtagice MCU, because you still have an old desktop with serial port.
The first step is to make a serial port ISP burner. I found several circuit diagrams in the computer. The following is the simplest and easiest to make. After welding the circuit diagram, download the ponyprog2000 programming software (the interface is as follows), and use the desktop with serial port to successfully read and write flash directly.