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Normally memory is allocated from slots 1-2-3-0 in that order.
If you specified MM_MUL in OS_Mop, 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.
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