Reference Guide

ZCOM Tables and Data Structures
ZCOM Header Structure
Chapter 3 45
HLABEL - ZMON identifier label
The identifier label contains the word ‘ZMON’ and provides compatibility
with HP1000 version of ZCOM. The memory image file contains the word
‘TTGE’ in this position. The LDM overwrites this after the ZCOM
subsystem has been initialized.
HZREVC - ZCOM revision code
TTGEN initializes this field with a 16-bit revision code, indicating the
version of the table structures. This revision code is stored as four 4-bit
digits. The first two digits represent the revision of a major release and
the last two digits represent a minor release revision. Data structures
and applications linked with a previous revision of the ZCOM software
will be compatible if they have same major revision code. ZMON checks
whether the revision code is acceptable. The different minor numbers
indicate compatible revisions, such as bug fixes (as long as the major
release revision code is the same).
HTREVC - TTGEN revision code
TTGEN inserts its integer revision code in this field in the memory
image file. It is loaded into memory (unchanged) by ZMON and the LDM.
This 16-bit revision code is stored in the same format as the ZCOM
revision code (HZREVC). However, there is no validation of this field.
HNAME1 - Name of the TTGEN source file
Full path name of the source file used by TTGEN to generate the object
file. This field is limited to 256 bytes and is null terminated.
HNAME2 - Name of TTGEN object file
Full path name of the TTGEN produced object file which was then used
to startup (initialize) the ZCOM subsystem. This field is limited to 256
bytes and is null terminated.
HSNAME - ZCOM subsystem runtime instance name
Contains the contents of the System-Name parameter supplied in the
TTGEN configuration file. This field is limited to 80 bytes and is null
terminated.
HSSOFF - System starting offset