The programmer is connected directly to the ISP pins on the PCB.

This is the most common tool used to "burn" the firmware onto the ATmega324 or ATmega644 chip found inside the T7. How to Flash the Firmware

A specialized port for the T7H hardware (which uses the ATmega644 MCU) can be found on this GitLab page k-firmware (Karl-Heinz Kübbeler's version):

: The original project branch. While development is slower, it remains stable for basic use. K-Firmware Source (GitHub) : Contains pre-compiled files for specific kits in the mega328_color_kit directory. General Collection Transistortester-Warehouse (GitHub)

A specific GitHub repository for Markus's firmware, adapted for the LCR T7 (16 MHz, added rotary encoder), is available via scottmudge/ComponentTester-firmware .

The is not a single, permanent URL. Firmware evolves, and so do clones. To stay safe: