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Portable Network Graphic  |  1997-07-26  |  58KB  |  816x1056  |  8-bit (256 colors)
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OCR: Sat, Feb 17 1996 Beginners Guide Macintosh Assembly Language Programming 22age Summary The important points that we have covered so far: The 00089 series has sixteen registers. X data registers and 8 address regist ters Data registers maybe used for bytes, words long words. Address registers may be used for pirM 10 long words only. If a word is moved into an address register, then it is sign extended to a long word There are two special registers. The program counter (PC) and the status register (SR) The PC contains the address of the next instruction tc be executed The SR contains the state of the processor. The upper bits of the SR are called the system byte, and cannot be accessed by programs running in user r mode. The lower 8 bytes are called the condition code register (CCR This byte ...