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Register parameters

Code Block
languagenone
titleRST 20H, DEFW DEFB $57
IN:
     IX = memory pool handle (returned from OS_Mop)
     BC = size of memory to release
     AHL = extended pointer address to beginning of memory block (A = bank)

OUT, if call successful:
     Fc = 0
OUT, if call failed:
     Fc = 1
     A = error code:
          RC_HAND ($08), bad handle
          RC_BAD ($04), invalid AHL/BC/IX combination

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

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