Changes
Z80
,/* Internal state */
Normally, you never see the content of this register. But it leaks the info through in case of the SCF/CCF instructions. [https://worldofspectrum.org/forums/discussion/41704 Source]
Emulating Q is not strictly necessary. Only a 1-bit flag, indicating whether the previous instruction computed flags, is needed to emulate the behaviour of SCF/CCF. Also note that POP AF and EX AF,AF' do not compute new F values. [https://github.com/hoglet67/Z80Decoder/wiki/Undocumented-Flags#scfccf Source]
|-
| IR (Instruction Register) || 8-bit || Holds the opcode of the currently executing instruction || Internally used, not accessible by the programmer
