Installed the latest #AVRCPM v3.5_R241M
on my "AVRCPM-Stick"
(which was running v2.3_R185)
via a #Arduino UNO and a #USBTINY adapter

AVCPM do use a #ATmega328P-PU and 2 RAM-Chips

https://www.mikrocontroller.net/articles/AVR_CP/M