OS_Mop, Open memory (allocate memory pool)
Register parameters
IN: A = memory mask arguments (several arguments OR'ed together): Destination segment (allocated memory addressed for segment): MM_S0 ($00), segment 0 MM_S1 ($40), segment 1 MM_S2 ($80), segment 2 MM_S3 ($C0), segment 3 Source of memory (to be allocated): MM_FIX ($02), fixed workspace (not subject to swapping) MM_SLT ($04), explicit slot usage MM_EXC ($10), exclusive use of bank MM_MUL ($20), use multiple banks B = 0, always C = bank or slot number if MM_SLT = 1 and MM_MUL = 0 MC_AS ($00), find an exclusive bank in any slot MC_CI ($10), internal memory MC_C1 ($01), card 1 MC_C2 ($02), card 2 MC_C3 ($03), card 3 or ($20-$ff), explicit bank OUT, if call successful: Fc = 0 IX = memory pool handle OUT, if call failed: Fc = 1 A = error code: RC_NA ($06), handle not available RC_ROOM ($07), no room Registers changed after return: A.FBCDEHL/..IY same .F......./IX.. different
Notes
If only destination segment is specified, you get memory from bank with most free space. Pool is limited to one bank.
OS_Mop doesn't allocate any memory, so even the very first OS_Mal can fail.
If MM_MUL is specified, memory is allocated from all the memory available (pool is not limited to one bank).
If MM_EXC is specified, memory is allocated from free banks in priority, pool is not limited to one bank (OZ 5.0 and newer).
If MM_FIX is specified, only memory not subject to swap is allocated.
If MM_SLT is specified, C holds bank number ($20-$FF) or slot.
If you specified MM_MUL, you can force slot 1-3 during first OS_Mal by loading A with slot number.
Related calls
OS_Bix, Bind in extended address
OS_Box, restore bindings after OS_Bix
OS_Fc, select fast code (fast bank switching)
OS_Mal, allocate memory
OS_Mcl, close memory (free memory pool)
OS_Mfr, free (previously allocated block) memory
OS_Mgb, get current bank binding in segment
OS_Mpb, set new bank binding in segment