After learning about STA, the instructions STX and STY follow naturally. They allow your program to store the contents of the X and Y index registers into memory. If you’re managing data structures, looping through arrays, or setting up pointers, you’ll frequently want to move index values into memory — and that’s where these instructions.

Let’s continue the blog series with a combined post about the 6502’s LDX and LDY instructions.The sibling instructions of LDA. In the 6502 instruction set, LDX and LDY are the counterparts to LDA. While LDA loads a value into the accumulator, LDX and LDY load values into the index registers X and Y, respectively. These.

After learning how to load values into the accumulator using LDA, it’s time to store them back into memory. That’s exactly what the STA instruction does. Where LDA is about input, STA is about output. It allows your 6502 program to write the value currently held in the accumulator (A) to a specific memory address..

The LDA (Load Accumulator) instruction is one of the most frequently used opcodes on the 6502 processor. It loads an 8-bit value into the A register, also known as the accumulator. This value can come from memory or be embedded directly in the instruction itself. Understanding LDA is a great starting point for learning how.

If you’re new to programming the 6502 microprocessor—or revisiting it from the world of modern computing—one of the first terms you’ll encounter is the opcode. This blog post lays the foundation for the rest of the series by explaining what opcodes are, how they relate to the 6502’s architecture, and why understanding them is key.