2007-05-13

Argh! My Brain!

From “6502 Software Design”, by Leo J. Scanlon, 1981:

Zero page indexed addressing is to zero page addressing as absolute indexed addressing is to absolute addressing. With zero page indexed addressing, the effective zero page address of the operand is computed by adding the contents of the X or Y register to the zero page base address contained in the second byte of the instruction.

That’s a sentence that George Eliot herself would have been proud of. It’s a good job I already understand this stuff…