Реверс-инжиниринг Z80

[zebest]

про "специальный RESET" лет 10 как известно, даже в эмуле есть. В специальном.
Вот кратенько по годам, что-когда раскопали:

* 2006 - [MEMPTR](https://zxpress.ru/zxnet/zxnet.pc/5909)
* 2012 - [Q: Zilog](https://worldofspectrum.org/forums/discussion/41704)
* 2014 - [Special Reset](https://github.com/redcode/Z80/wiki/Z80-Special-Reset)
* 2018 - [Additional flag changes of the block instructions](https://github.com/hoglet67/Z80Decod...cumented-Flags)
* 2018 - [Q: NEC / ST](https://github.com/hoglet67/Z80Decod...cumented-Flags)
* 2021 - [`reti` and `retn` reject INT when IFF1 != IFF2](https://floooh.github.io/2021/12/17/...n-instructions)
* 2022 - [MEMPTR during the additionaal flag changes of `otir` and `otdr`](https://github.com/hoglet67/Z80Decoder/issues/2)
* 2022 - [NMI rejection](https://spectrumcomputing.co.uk/foru...pic.php?t=7086)
* 2023 - [MEMPTR during the additional flag changes of all I/O block instructions](https://spectrumcomputing.co.uk/foru...ic.php?t=10555)
* 2024 - [Unstable flag behavior of `ccf` / `scf`](https://github.com/hoglet67/Z80Decod...-SCF-Behaviour)