Accessing parameters

Unlike other commands or subcommands, TEST subcommands do not access the command processor parameter list (CPPL). Instead, TEST subcommands begin by accessing the TEST communication table (TCOMTAB).

When a TEST subcommand receives control, register 9 points to the TCOMTAB. In the TCOMTAB, significant fields for TEST subcommands are:

The INBUF field at decimal offset 120, which points to a subcommand buffer passed from TEST
The TSTUPT field at decimal offset 92, which points to the UPT
The TSTECT field at decimal offset 96, which points to the ECT
The TPLPTR field at decimal offset 80, which points to the TEST parameter list (TPL). The TPL contains pointers to other information, including the PSCB.

Those fields of the TCOMTAB point to the same information that other subcommands would obtain from the CPPL.