%define START   0x110000
        tib     equ 0x100000            ;Input buffer (grows upward);
        rp0     equ tib+400h            ;Return stack (grows down)
        sp0     equ rp0+100h            ;Data stack (grows down)
        d0      equ sp0+10h             ;Dictionary header space
        h0      equ START+50000
