The ZX81 was contemplated with a great amount of peripherals of diverse developers, such as memory cards, sound generators, modems, HIRES cards and disk controllers. Here will be presented diverse hardware projects destined to extend the limit of these computers and also the schems of the computers and peripherals, when available.


Schematics

TK82/NE-Z8000

TK82 with 8Kb ROM but without SLOW circuit

CP200

The schem has some imperfections :-(

Magazine Articles

Implementing the SLOW on the NEZ-8000 (Interface Magazine, sorry the article is in portuguese):

        


I believe that the adaptation of the SLOW for the TK82C is sufficiently seemed or even though equal to the one for the NEZ-8000. If this will be truth, this circuit would complement the TK82 schematical presented above.