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OS_Mop doesn't allocate any memory, so even the very first OS_Mal can
fail.
If you specified MM_MUL, you can force slot 1-3 during first
OS_Mal by loading A with slot number
If you didn't specify MM_MUL, all memory allocated from that pool is
guaranteed to be in same bank. Additionally, memory area returned from
OS_Mal is guaranteed to be in single page.
If only the memory segment mask are specified, it is probably default'ed to MM_MUL. MM_FIX is probably an internal usage.
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