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6502 Assembly Language Subroutines - download pdf or read online

By Lance A. Leventhal

ISBN-10: 0931988594

ISBN-13: 9780931988592

OOsborne/McGraw-Hill 1982. Wrap fresh with part put on. Binding tight, publication sq.. best of booklet has a few soiling. Pages are fresh without names, marks or highlights. Proceeds profit the Oro Valley Library.

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Example text

Branching Based on Equality • Determine if the value in the accumulator is equal to another value by subtraction. The Zero flag will be set to 1 if the values are equal. The Compare CHAPTER 1: GENERAL PROGRAMMING METHODS 23 instruction (CMP) is more useful than the Subtract instruction (SBC) because Compare does not change the accumulator or involve the Carry. Examples 1. Branch to DEST if the accumulator contains the number VALUE. CMP #VALUE ;IS DATA = VALUE? BEQ DEST ;YES, BRANCH We could also use index register X with CPX or index register Y with CPY.

LDX LDA STX PHA LDA LDX STA LDY PLA STA PGZRO HEAD ;REPLACE HEAD, SAVING OLD VALUE HEAD PGZRO+1 HEAD+1 HEAD+1 #0 ;INDEX = ZERO ;NEW HEADfS LINK IS OLD HEAD (HEAD),Y TXA INY STA (HEAD),Y • Remove an element from the head of the queue and set the Zero flag if no element is available. LDY LDA #0 STA INY PGZRO LDA (HEAD),Y (HEAD),Y ;GET ;GET ADDRESS OF FIRST LESS SIGNIFICANT ELEMENT BYTE ;GET MORE BYTE SIGNIFICANT CHAPTER 1: GENERAL PROGRAMMING METHODS 43 STA PGZRO+1 ORA PGZRO ;ANY BEQ DONE ;NO, DONE (LINK ;YES, MAKE NEXT LDA (PGZRO),Y STA (HEAD),Y ELEMENTS IN QUEUE?

You can then use postindexing to obtain the element. • Load memory locations POINTH and POINTL with a 16-bit element from a table. Assume that the base address of the table is BASE (a constant) and the index is in memory location INDEX. LDA ASL INDEX A ;GET THE INDEX ;DOUBLE IT FOR TWO-BYTE BASE,X ;GET LDA BASE,X ;GET MSB STA POINTH ENTRIES TAX LDA LSB OF ELEMENT INX OF ELEMENT We can also handle the case in which the base address is a variable in two memory locations on page 0 (PGZRO and PGZRO+1).

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6502 Assembly Language Subroutines by Lance A. Leventhal


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