1         .module wc_resident_call
                                      2         .area _CODE
                                      3         .globl _wc_resident_call
    00000000                          4 _wc_resident_call::
    00000000 EB               [ 4]    5         ex      de, hl                  ; HL = addr (from DE = 2nd arg)
                                      6         ; A = page (1st arg, already in A)
    00000001 CD 28 60         [17]    7         call    0x6028                  ; resident call — returns here
    00000004 C9               [10]    8         ret