EMM Status

 Upon return from an INT 67h request to the Expanded Memory Manager, the
 AH register always contains a status/error code.  If the status is not 0,
 then the requested function was not performed and any values returned by
 EMM are meaningless.  These errors are defined:

   Status  Meaning
   ▀▀▀▀▀▀  ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀
      0    no error; function was successful; returned parms are OK

     80H   internal error in EMM driver
     81H   EMS memory board hardware malfunction
     82H   EMM is busy
     83H   invalid handle
     84H   undefined function requested
     85H   no more EMM handles available
     86H   error in save or restore of mapping context
     87H   allocation request was larger than total EMS memory
     88H   allocation request was larger than available pages
     89H   you can't open a handle with a page count of 0
     8aH   your handle doesn't own that many pages
     8bH   illegal mapping.  Only physical pages 0-3 are defined
     8cH   mapping context save area is full
     8dH   you can save context only once per handle
     8eH   you can't restore context without a prior save
     8fH   Subfunction parameter in AL not defined
           ────────────────────────────────────────────── (EMS 4.0 codes)
     90H   attribute type undefined
     91H   non-volatility not supported
     92H   source and dest overlap in EMS RAM (warning, not error)
     93H   destination area in handle too small
     94H   conventional memory overlaps EMS RAM
     95H   offset too large in block move
     96H   block size too large; ie, > 1M
     97H   source and dest are in same handle and overlap
     98H   source or dest memory type invalid (in offset 4 of packet)
     9aH   alternate map register set in not supported
     9bH   all alternate map/DMA register sets are all allocated
     9cH   all alternate map/DMA register sets are not supported
     9dH   specified alternate map/DMA register set invalid or in use
     9eH   dedicated DMA channels are not supported
     9fH   specified DMA channel is not supported
     a0H   no handle matches specified name
     a1H   the specified name already exists
     a2H   source offset+region length > 1M (attempted to wrap)
     a3H   contents of specified data packet are corrupted or invalid
     a4H   access to this function has been denied (bad access key)

See Also: INT 67H: EMM Services