=> R0 = 2
R1 = pointer to heap
R2 = size of block required (bytes)
<= R1 = pointer to anchor
This call is used to claim a block of memory from the heap.
The size of the block claimed will always be rounded up to at least the nearest multiple of four bytes.
The call returns a pointer to a word holding the address of the block, so in BASIC terms block_address%=!anchor%. Blocks can move about in response to any heap operation, so you must ensure your block_address% is updated after any heap operation.
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