BLOCK DATA 
 
      INTEGER  AREG,   XREG,   YREG,   NRREGS 
      INTEGER  STATUS (10),    STAREG, STXREG, STYREG 
      INTEGER  REGS (10) 
      INTEGER  ACTREG (2),      ACTLO,  ACTHI 
      INTEGER  NZREG 
      INTEGER ICLP10 
      COMMON   / REGS / AREG,   XREG,   YREG,   NRREGS 
      COMMON   / REGS / STATUS, REGS,   ACTREG, NZREG 
      COMMON   / REGS / ICLP10 
      EQUIVALENCE    (ACTLO,  ACTREG (1)) 
      EQUIVALENCE    (ACTHI,  ACTREG (2)) 
      EQUIVALENCE    (STAREG, STATUS (1)) 
      EQUIVALENCE    (STXREG, STATUS (2)) 
      EQUIVALENCE    (STYREG, STATUS (3)) 
      DATA  AREG  / 1 / 
      DATA  XREG  / 2 / 
      DATA  YREG  / 3 / 
      DATA  NZREG /11/ 
      END