* CALL nn takes 6 cycles on the GBZ80, but 5 NOPs on the Z80
* ADD HL,ss takes 2 cycles on the GBZ80, but 3 NOPs on the Z80
* JP cc,nn has different timings depending on whether the jump is taken. This is not the case on Z80.
Flags can differ too:
* DAA clears HF in the GBZ80, but not in the Z80
Fun fact: Way more GBZ80 cores were produced for Gameboy hardware (118 million Gameboys and 81 million GBA) than all the Z80 chips produced for home computers and game consoles. [https://www.chibiakumas.com/z80/Gameboy.php Learn GBZ80 Assembly Programming with ChibiAkumas]
<br>
== Weblinks ==
*[https://www.chibiakumas.com/z80/Gameboy.php Learn GBZ80 Assembly Programming with ChibiAkumas]
*[https://gbdev.io/resources.html Awesome Gameboy resources]
*[https://gbdev.gg8.se/wiki/ GBDev wiki]
*[https://emudev.de/ Emudev (q00.gb)]
*[https://gekkio.fi/files/gb-docs/gbctr.pdf Game Boy Complete Technical Reference]
*[https://github.com/SingleStepTests Tom Harte's SingleStepTests]