I pulled an Amstrad cpc464 out of the loft at the beginning of the year and headed deep down the rabbit hole. For me the most interesting thing is interfacing with modern microcontrollers. Pics, stm32, esp(s) etc. There's something about telneting to BBS over the internet from a machine from 1985. The wargames effect maybe. Standouts for the CPC include the M4 board, the dandanator and the USIFAC. I have a lot of respect for those who built these. Despite an engineering degree and a 25 year career my low level knowledge has expanded greatly from playing with these things. It's also been a lot of fun.