This video is about writing assembly code on a real zx81 just for the hell of it. It's possible now as it was back then to write code(assembly or higher level language) on a different computer and then save that compiled or assembled code in the real zx81. I just wanted to explore some options that might have been open to small scale home coders, not those working for or owning their own companys.
some code on my github:
https://github.com/AdrianPilko/ZX81_Assembler_ZXAS
get the zxas assembler from here:
https://spectrumcomputing.co.uk/entry/31888/ZX81/ZXAS
see also this great page:
https://bumbershootsoft.wordpress.com/2017/03/06/zx81-on-to-machine-code/