ACC Programmer's Reference Guide

46 Chapter3

ZCOM Tables and Data Structures

ZCOM Header Structure

HLTDSZE - Logical terminal table LDATA buffer size

This specifies the size of the LDATA buffer in the logical terminal tables.

This value is initialized from the Logical-Size parameter in the TTGEN

configuration file. Set this parameter to 212 for backward compatibility

with HP 1000 programs (so that the total size of Logical Terminal Table

with extension is 512 bytes).

HLTMAX - Number of logical terminal tables

Contains the maximum number of Logical Terminal Ta bles (LTT) which

may exist in the configuration. This value is initialized from the

Logical-Term parameter in the TTGEN configuration file.

HPTMAX -Numberofphysicalterminaltables

Contains the maximum number of Physical Terminal Tables (PTT)

which may exist in the configuration. This value is initialized from the

Physical-Term parameter in the TTGEN configuration file.

HNCARD - Number o f Mux interface tables

Number of Interface Tables (IFTs) which may exist in the configuration.

This value is initialized from the Interface-Table pa rameter in the

TTGEN configuration file. Note tha t there is one Interface Tabl e (IFT)

per Mux card defined.

HNRESP -Numberofresponserecords

This field contains the number of response records in the ZCOM

subsystem. This value is initialized from the Program-ZLU parameter in

the TTGEN configuration file.

HNLTQL - Number of LTT queue labels

Numberof entries in the queue label table, up to a maximum value of 20.

It is initialized by TTGEN to the number of Logical-Data statements

defined in the TTGEN configuration file. This value can be modified by

calling the zltqueue() routine.

HNLTSL - Number of LTT storage labels

Number of entries in the storage label table, up to a maximum value of

20. It is initially set up by TTGEN and subsequently maintained by the

LDM.

HPNTBL - Node Table pointer (znode_type *)

This is a pointer to the first entry in the Node Table. Note that all of the

node entries are stored in sequential order within kernel memory.