Page Comparison

 IN:
     A = 0, always
     BC = requested size of reserved memory in bytes (2 to 256)
     IX = memory handle (returned from OS_Mop)
OUT, if call successful:
     Fc = 0
     HL = address of memory allocated (H14 & H15 are memory are memory
     mask)
     B = bank number of allocated memory
     C = segment specifier implied by HL (H14 & H15)

OUT, if call failed:
     Fc = 1
     A = error code:
          RC_HAND ($08), IX is not a valid memory handle
          RC_ROOM ($07), no room to allocate block in MEMORY POOL
          RC_ERR ($0F), if BC > 256 bytes, fatal error

Registers changed after return:
     ....DE../IXIY same
     AFBC..HL/.... different