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Register parameters

IN:
     BHL = extended pointer to first string (B = 0, HL is local)
     DE = local pointer to second string

OUT:
     Fz = 0, strings are different
     Fz = 1, strings are equal

Registers changed after return:
     ..BCDEHL/IXIY same
     AF....../.... different

Notes

Both strings should be null-terminated
Comparison is case-independent ('A' and 'a' are the same)

Related calls

GN_Rbe, read byte at extended address
GN_Wbe, write byte at extended address
OS_Bde, copy bytes to extended address
OS_Bhl, copy bytes from extended address