Returns information on a dynamic area
=> R0 = 2
R1 = area number
<= R0, R1 preserved
R2 = current size of area, in bytes
R3 = base logical address of area
R4 = area flags
R5 = maximum size of area, in bytes
R6 = pointer to dynamic area handler, or 0 if no routine
R7 = pointer to workspace for handler
R8 = pointer to name of area
This call returns information on a dynamic area.
For doubly-mapped areas, R3 on exit from this call returns the address of the boundary between the first and second copies of the area, whereas OS_ReadDynamicArea returns the start address of the first copy (for backwards compatibility).
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