Document	Description	Download
Z80 Insctruction Set Data	(XLS) Excel spreadsheet describing Z80 instructions (opcodes and mnemonics) with detailed timing data (includes M1 cycles).	Download Rev.4 (2004)

Document	Description	Download
ZX Spectrum Top Secret	(PDF) During the process of porting ZX Spectrum games to MSX, I've faced an unexpected problem: the lack of organized documentation. Therefore, inspired by "MSX Top Secret" project, I've created this document to help those who want to develop/understand programs for Spectrum plataform. This is a "work in progress" effort... and it is a "portugues only" project.	Download Rev.8 (May 20, 2012)

Document	Description	Download
GameBoy Advance Top Secret	(PDF) Before the official GameBoy Advance documentation was released, the development process was hindered by the absence of propper documentation. This little document was developed to fulfil this role and is now made available as "historical evidence".	Download (2001)