Memory usage and ZEBRA

The HBOOK system uses the ZEBRA data manager to store its data elements in a COMMON block /PAWC/ (shared with the KUIP and HIGZ packages, when the latter are also used, as is the case in PAW). In fact the first task of a   HBOOK user is to declare the length of this common to ZEBRA by a call to HLIMIT, as is seen in figures and

In the /PAWC/ data store, the HBOOK, HIGZ and KUIP packages have all their own division (see [10] for more details on the notion of divisions) as follows (see figure ):

LINKS

Some locations at the beginning of /PAWC/    for ZEBRA pointers.

WORKS

Working space (or division 1) used by the various packages storing information in /PAWC/

HBOOK

Division 2 of the store. Reserved to HBOOK.

HIGZ

A division reserved for the HIGZ graphics package. This division only exists when HIGZ is called.

KUIP

A division reserved for the KUIP user interface package. This division only exists when KUIP is called.

SYSTEM

The ZEBRA system division. It contains some tables, as well as the Input/Output buffers for HRIN and HROUT.

      COMMON/PAWC/NWPAW,IXPAWC,IHDIV,IXHIGZ,IXKU,FENC(5),LMAIN,HCV(9989)
      DIMENSION IQ(2),Q(2),LQ(8000)
      EQUIVALENCE (LQ(1),LMAIN),(IQ(1),LQ(9)),(Q(1),IQ(1))

The layout of the /PAWC/ dynamic store  

• The use of ZEBRA