This is a hobby computer based on the 65C02 processor. (I use 6502 and 65C02 interchangeably in this document, but there are some differences)
There are already many computers based on the 6502 processor, old ones such as as the Apple 1, Apple II, Commodore 64 and many more; and many more recent ones, from homebrew affairs on prototype board, to complete replicas of old systems.
The one that most closely resembles the Planck is probably the RC6502, itself based on the RC2014 (which uses a Z80 processor) with adaptations to the expansion bus to make it fit the 6502 processor.
Planck is a new variant on this type of expandable machines with a different set of tradeoffs.
I really like the genre of small, hobbyist built computers, especially with a retro vibe. I need to actually learn how to use KiCAD one of these days and start on a similar project.
If you need a hardware two-factor solution, this looks like a really interesting option. The hardware and firmware for their past products are open source (and I assume the designs for the new one will be as well). The nested PCB construction is especially interesting.
Due to an abundance of one specific type of DVD drives, plans were made to give a useful afterlife to these devices. A laser scanning microscope seemed to be the most useful project.
Not an easy project, but an interesting re-use of old DVD drive components.
I fancied getting an eink screen to use for future projects. I bought a wee one with a raspberry pi “hat” attached. However, I realised later that I could maybe just re-purpose an old Amazon Kindle ebook reader.
This is a good article on repurposing an old Kindle as an e-ink display or development platform. This could be a great way to build the e-ink weather station I’ve had as a project idea. Very cool!