* a second time image does move perfectly (completely/totally) left and right without crop, and if centered has 6.5 black border left and right. This time image seems complete but crushed.
=== FDC do_update refactor ===
FDC does execute instructions when IO_RD/IO_WR does change state. If not it is then locked in phase "PHASE_COMMAND", normaly "PHASE_COMMAND" shall be executed despite of FDC address being entered. Global FDC state machine have to be first refactored this way : do progress despite of do_update events.
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