+ /* there are alternate AF,BC,DE,HL register sets, and a few instructions
+ that swap one for the other */
+ TYPE_UBYTE aA;
+ TYPE_UBYTE aF;
+ DEF_REGPAIR(aBC, a_bc);
+ DEF_REGPAIR(aDE, a_de);
+ DEF_REGPAIR(aHL, a_hl);
+ TYPE_UBYTE iv; /* interrupt vector, see ed 47 ld A,IV.. */