> Hi, > > The xz80 Z80 core (as used by SimCoupe) seems to set the zero flag when B is > non zero after INI and OTI instruction and reset it when B is zero. SimCoupe > has inherited the same behaviour, but I've noticed a commented out section > of code that seems to do what I'd expect. I seem to have lost my Programming > the Z80 book so I can't check it. > > I found a web site I found detailing them the flags that says the zero flag > is indeterminate, yet BDOS relies on the zero flag matching B to do block > reads from the hard disk, and it must work on a real SAM. > > Can anyone confirm what the official docs say?
Are there any _official_ docs? :) From memory: Z = 1 if B = 0, else Z = 0. -Frode
