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Additional info for Circuit Cellar (March 2003)

Sample text

A program status word (PSW) indicates the current state of the CPU. , accumulator (ACC), program counter, and stack pointer). There may be other general-purpose registers that are used under program control for various data manipulation operations. The size and number of the registers may differ with CPUs. Despite the type of processor, the monitor program should preserve all of the registers during a context switch. These registers are saved in the memory and later displayed on request. When you ask for a display of the SP register, for example, the monitor program reads the contents of a memory location holding SP—the value is preserved earlier by the context switcher—and prints it.

Processor-specific, breakpoint, and single-stepping implementation may be a better option. The code that handles the command interpretation, syntax checking, memory, and register examination and modification is processor-independent. Most of the data structures used for register, breakpoint, single step- 38 Issue 152 March 2003 ping, and memory manipulations are also portable. Because we used pointer variables to access memory, the C implementation for any other processor shouldn’t pose a problem.

The rest of the devices on the upgrade board provide the functions of the HCS II upgrade. Voice chips, RS-232/ 485 interfaces, caller ID interfaces, display and keyboard interfaces, switches, LEDs, as well as an array of sensor inputs and outputs are provided. The voice chips provide much of the functionality of the old HCS voice board, but have my own voice rather than the machine-like voice of the old system. The chips also allow messages to be recorded, thus allowing me to create answering machine functions on the HCS II.

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Circuit Cellar (March 2003)

by Christopher

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