Assembler course part 1
@eZine
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Assembler course
· 2 years ago
... A and JMP. LDA : LDA is an abbreviation (Mnemonic) for Load Accumulator. We use LDA to load a one-byte value into .A. The simplest LDA command is LDA #Value. As an example, LDA #$01 flat-out loads the value 1 into .A, LDA #$02 the value 2, and so on for any value $00 through $FF. Note that the "#" sign is required, to specify "immediate" mode. STA : STA is the abbreviation for Store Accumulator. With STA we store the contents of .A to someplace in main memory (or perhaps, into an I/O chip like the SID). The contents of .A are left unchanged after the store operation. The simplest STA command is STA Address. For example, STA $3000 would store the ...
