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31 lines
811 B
Markdown
31 lines
811 B
Markdown
---
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title: "07-6809-advanced"
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aliases:
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tags:
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- lecture
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- cosc204
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---
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10 addressing modes
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- implied `inca`
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- immediate `lda #$00`
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- extended `LDA $31FE`
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- extended indirect `LDA [$31FE]` or `LDA [HERE]` points to a memory location which specifies another memory location
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- direct `LDA $ff` or `lda <HERE`
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- register `trf X,Y`
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- indexed `LDA $3111E, X` use memory location that is the sum of the operands
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- `LDA ,X`
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- `LDA $23,X`
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- etc
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- indexed indirect `LDA [$10, X]`
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- relative `BEQ HERE`
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- BEQ does a short branch
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- LBEQ does a long branch
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- the value is relative to HERE
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- program counter relative `LDA TABLE,PCR ; A = the value stored at TABLE`
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- if all memory references are relative, then the program cna be loaded anywhere is memory, and will still work. It is said to be **relocatable**
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