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content/notes/07-6809-advanced.md
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@ -10,12 +10,21 @@ tags:
- implied `inca` - implied `inca`
- immediate `lda #$00` - immediate `lda #$00`
- extended `LDA $31FE` - extended `LDA $31FE`
- extended indirect `LDA [$31FE]` or `LDA [HERE]` - extended indirect `LDA [$31FE]` or `LDA [HERE]` points to a memory location which specifies another memory location
- useful in a device driver
- direct `LDA $ff` or `lda <HERE` - direct `LDA $ff` or `lda <HERE`
- register `trf X,Y` - register `trf X,Y`
- indexed - indexed `LDA $3111E, X` use memory location that is the sum of the operands
- indexed indirect - `LDA ,X`
- relative - `LDA $23,X`
- program counter relative - etc
- indexed indirect `LDA [$10, X]`
- relative `BEQ HERE`
- BEQ does a short branch
- LBEQ does a long branch
- the value is relative to HERE
- program counter relative `LDA TABLE,PCR ; A = the value stored at TABLE`
- 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**