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Z8000 consists of sixteen 16-bit general purpose registers, which can be used for data, address and indexing. The designers of this machines felt that it was useful to provide a regularized, general set of registers than to save instruction bits by using special purpose registers. Further the way the functions are assigned to these registers is the responsibility of the programmer. There might be different functional breakdown for different applications.

A segmented address space 7-bit is used. It uses 7-bit segment number and a 16-bit offest. It uses two registers to hold a single address. There are two other registers called stack pointers that are necessary for stack module. One register used for system mode and one for normal mode.

Z8000 consists of five other registers that are related to program status. Two registers hold the program counter and two registers hold the address of a program status area in the memory. A 16-bit flag register called Flag control word holds various flags status and control bits.

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Q: 2 Explain the register Organization of Zilog 28000?
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