== Chip Variants ==
The [[GBZ80]] (Sharp SM83) that powers the original [[Nintendo GameBoy]] is an in-between the [[Intel 8080]] and Z80. [https://gbdev.io/pandocs/CPU_Comparison_with_Z80.html Source] [[Media:GBCPUman.pdf|Game Boy CPU Manual]] [https://gekkio.fi/files/gb-docs/gbctr.pdf Game Boy complete technical reference] [https://youtu.be/GBYwjch6oEE Reverse engineering the Game Boy hardware] [https://youtu.be/HyzD8pNlpwI The Ultimate Game Boy Talk] [https://emudev.de/ Emudev (gb-si)] [https://github.com/c-sp/game-boy-test-roms Game Boy test roms]
However, the Sega Master System and Game Gear use a standard Z80 CPU. [https://segaretro.org/images/d/d6/SoftwareReferenceManualForSegaMarkIIIEU.pdf Reference manual for Sega MarkIII] [https://segaretro.org/images/1/16/Sega_Game_Gear_Hardware_Reference_Manual.pdf Reference manual for Game Gear]
*[https://baltazarstudios.com/z80explorer/ Z80 Explorer] [https://baltazarstudios.com/zilog-z80-undocumented-behavior/ Complete list of Z80 instructions and their bus responses and cycles dumped from real hardware]
*[https://floooh.github.io/visualz80remix/ VisualZ80remix] [https://floooh.github.io/2021/12/06/z80-instruction-timing.html Detailed look at Z80 instruction timings with the help of a Z80 netlist simulation]
*[https://floooh.github.io/2021/12/17/cycle-stepped-z80.html Cycle-stepped Z80 emulation how-to] [https://emudev.de/ Emudev (gb-si)]
*[https://github.com/SingleStepTests Tom Harte's SingleStepTests]
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