LDx

LDX

LDX is an acronym with multiple meanings across different domains. In computing, LDX is most commonly the mnemonic for the instruction “Load X,” used on several microprocessor architectures to load a value into the index register X. On the 6502 family, LDX loads the X register with an 8-bit or 16-bit value depending on the addressing mode; on the 6809 and related CPUs, LDX loads a 16-bit value into the X index register, with various addressing modes. The exact behavior—such as whether data is immediate or from memory—depends on the processor and addressing mode.

Beyond the technical usage, LDX may appear as an identifier in branding, product names, model numbers, or organizational codes. In these contexts, LDX is not standardized and its meaning is determined by the issuing entity.

Because LDX is used in different areas, the intended meaning depends on the domain. This article summarizes the principal technical usage and notes that other meanings exist in nontechnical branding and documentation. Readers should consult domain-specific references to determine the precise interpretation in a given context.