=> R0 = 1 for claim, 0 for release
R1 = bytes required
<= C set : memory not claimed
R1 = bytes available
C clear : memory claimed
R1 = bytes available
R2 = start address
Can only be claimed if no other bank than 1 has been used. While claimed you must not cause screen to scroll.
Not very useful, is it?
See PRM 1, page 380.
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