See all articles from Syntax/Syntax ZX80 v5 n6
If you need to know about how the CPU, ROM, RAM, sound chip, joysticks, keyboard, display hardware, cassette ports, or any other facet of the hardware works, or you need pinouts for any of the connectors inside or outside, or you need to understand how the ROM cartridge software gets loaded, or how the operating system calls work, or how the machine interfaces to available Timex hardware, you will want a copy of this book.