`.XWORD` or `.DX`

Directives that specify 24 bit values of the resulting code. According to Convention 6502, the least significant byte is placed first, followed by more significant bytes.

Syntax:

    [<label>[:]] .DX expr {  , expr }
    [<label>[:]] .XWORD expr { , expr }

Example:

    alpha:    .DX $123456, 0    ; will generate $56, $34, $12, 0, 0, 0
    beta:     .XWORD alpha
              .XWORD alpha-1, beta