This is a collection of online sources of info I've found about the Z80 * General Z80 http://www.z80.info * Undocumented Z80 http://z80.info/zip/z80-documented.pdf The undocumented Z80 by Sean Young http://www.worldofspectrum.org/z88forever/dn327/z80undoc.htm Undocumented * Other Z80 emu http://www.mathematik.uni-ulm.de/users/ag/yaze-ag/ http://fms.komkon.org/ https://floooh.github.io/2017/12/10/z80-emu-evolution.html * tests http://www.jeffavery.ca/computers/macintosh_z80exerciser.html * Info about old ASM directives http://48k.ca/zmac.html http://www.mathematik.uni-ulm.de/users/ag/yaze-ag/ http://www.winape.net/help/macros.html