Instructions not coded in T80_MCode.vhdl but in T80.vhdl (strange, barbarian part of code ?) :
* Jump/E/XY Call RstP LDZ LDW LDSPHL Special_LD ExchangeDH/Dp/AF/RS
Inc_WZ register : take a look at [[http://www.righto.com/2014/10/how-z80s-registers-are-implemented-down.html § The WZ temporary registers]. It's a tmp internal register in fact.
=== Alignment of HSYNC Interrupt ===