ICS TRIPLEX T8821 Integrated circuit card

The 16XBug initializes and maintains a vector table area for target programs. A target program is any program started by the bug, either manually with GO or TR type commands or automatically with the BO command. The start address of this target vector table area is the base address of the debugger memory. This address is loaded into the target-state VBR at power up and cold-start reset and can be observed by using the RD command to display the target-state registers immediately after power up.

The 16XBug initializes the target vector 

table with the debugger vectors listed in Table 2-2 and fills the other vector locations with the address of a generalized exception handler. The target program may take over as many vectors as desired by simply writing its own exception vectors into the table. If the vector locations listed in Table 2-2 are overwritten then the accompanying debugger functions are lost. The 16XBug maintains a separate vector table for its own use. In general, you do not have to be aware of the existence of the debugger vector table. It is completely transparent and you should never make any modifications to the vectors contained in it.

Creating a New Vector Table 

Your program may create a separate vector table in memory to contain its exception vectors. If this is done, the program must change the value of the VBR to point at the new vector table. In order to use the debugger facilities you can copy the proper vectors from the 16XBug vector table into the corresponding vector locations in your program vector table. The vector for the 16XBug generalized exception handler may be copied from offset $08 (bus error vector) in the target vector table to all locations in your program vector table where a separate exception handler is not used. This provides diagnostic support in the event that your program is stopped by an unexpected exception. The generalized exception handler gives a formatted display of the target registers and identifies the type of the exception

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