Section 11,36: IBITS

 IBITS (integer, start-position, length)

 A function that returns the value of the bits specified by
 start-position and end-position (bit extraction).  The low-order
 bit is position 0.

 +------+---------+----------+------------+-------------+        
 | Args | Generic | Specific |  Argument  | Result Type |
 +------+---------+----------+------------+-------------+
 |  3   |  IBITS  |   --     | INTEGER*1  | INTEGER*1   |
 |      |         | IIBITS   | INTEGER*2  | INTEGER*4   |
 |      |         | JIBITS   | INTEGER*4  | INTEGER*4   |
 |      |see note | KIBITS   | INTEGER*8  | INTEGER*8   |
 +------+---------+----------+------------+-------------+

 NOTE: KIBITS is only available on AXP systems.