WHAT EMULATES RIGHT IN FBZX?

-Screen timmings in 48K and 128K mode.
-Screen generation, so border efects and even attribute changing efects works fine.
-48K sound.
-128K sound (fully emulation of the AY-3-8912).
-Trash in the bus when reading from a non-existing port. This is right generated (from the data being displayed in that moment) so games works right (like SHORTCIRCUIT, that runs without flicking).
-Spectrum 48K Issue 2 and 3 efects in the EAR bit are rightly emulated.
-Priority of joystick over keyboard.


WHAT DOESN'T EMULATE RIGHT (OR SIMPLY DOESN'T EMULATE) IN FBZX?

-Memory contention (the data is instantanealy available always, even when the ULA and the Z80 accesses in the same moment).
-Snow efect when I register points between 64 and 127 doesn't work.