Page Comparison

IN: A = flags
    A0 = type (0: step debug entry, 1: break point) [NOT IMPLEMENTED]
    A6 = call instruction (0: false, 1:true) [RESERVED]
    A7 = screen (0: user screen, 1: debug screen) [RESERVED]
    BHL = pointer to debug entry or break point

OUT: Fc=0, success and IX=handle
     Fc=1, failure and A=error
        RC_Hand, cannot allocate a debug handle
        RC_Wp, cannot debug in ROM

Registers affected after return:

    A.BCDEHL/IXIY same
    .F....../.... different