Behold, it's been reinvented! Now with 32K and 8 core processor!
Hydra Game Development System For $200 USD. Can be built for much less if you have a Nintendo NES and an old PC in the closet and a soldering iron.But you can save time and get one now.

The few of us who remember the good old days have been writing the games. Yes, it does do 10 PRINT and 20 GOTO 10 even though it has its own language and lots of friends to help.

The processor is more popular and cheaper than the HYDRA so if you're a tech you might want to make your own or get a cheaper kit, which would be easier than building ye olde Sinclair ZX81 kit and even more fun.