Changes
Z80
,/* Internal state */
|-
| WZ || 16-bit || Internal temporary register pair. Also known as MEMPTR || Used for memory and address calculations.
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 Z80, when the instruction doesn't compute new flags, this register is reset instead.
