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Portable Network Graphic  |  1997-07-26  |  125KB  |  816x1056  |  8-bit (256 colors)
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OCR: poirfistat tmemory location 99 eWhers sizechdatabarkgoftrahe staob the SP willnaow contain 1000 again. Any of the address registers can be used as a stack. but A7 the hardware stack pointer Whenev er the processor needs to put something on the stack 11 will use A7. If the abbreviation SP IS pesn then A7 IS pesn bv Fantasm example (see f vou can follow this through. I know haven introduced the various instructions vet. move. 1 do, -(sp) bsr op something move. (sp do This example shows how to preserve the value of D0, as a long, whilst the program branches to op something. op something IS what is called subroutine. Generally used to carry out common tasks needed bv i program, and to make a program a lot more readable! When the subroutine IS finisl hed. control will return to line the subrout ...