Method for providing an extensible register in the first and sec

Details Method for providing an extensible register in the first and sec Method for providing an extensible register in the first and sec

1992-12-24

1997-10-21

Bowler, Alyssa H.

Boots, shoes, and leggings

395385, 395386, 395389, 395500, 395376, 364DIG1, G06F 500

Patent

active

056806329

ABSTRACT:
A data processing system providing an extensible register and method thereof. A new CPU has an extensible index register. The new CPU is object code compatible with the old CPU having an 8-bit index register, yet the index register of the new CPU can be effectively extended to 16 bits when new instructions are used. As a consequence, the user is able to make the choice between using assembly code software written for the old CPU and having the functionality of an 8-bit index register, or writing new assembly code software for the new CPU and having the functionality of a 16-bit index register.

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