C***BEGIN PROLOGUE  POISP2
C***SUBSIDIARY
C***PURPOSE  Subsidiary to GENBUN
C***LIBRARY   SLATEC
C***TYPE      SINGLE PRECISION (POISP2-S, CMPOSP-C)
C***AUTHOR  (UNKNOWN)
C***DESCRIPTION
C
C     Subroutine to solve Poisson equation with periodic boundary
C     conditions.
C
C***SEE ALSO  GENBUN
C***ROUTINES CALLED  POISD2, POISN2
C***REVISION HISTORY  (YYMMDD)
C   801001  DATE WRITTEN
C   890531  Changed all specific intrinsics to generic.  (WRB)
C   891214  Prologue converted to Version 4.0 format.  (BAB)
C   900402  Added TYPE section.  (WRB)
C***END PROLOGUE  POISP2