Changes
Z80
,/* Internal state */
Normally, you never see the content of this register. But it leaks the info through to F5 and F3 in case of the BIT b,(HL) instruction. [https://zx-pk.ru/attachment.php?attachmentid=2989 Source]
|-
| Q || 8-bit || Internal register where it assembles the new content of the F register, before moving it back to F || On Zilog NMOS Z80, when the instruction doesn't <br />compute new flags, this register is cleared instead.
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]
