Read the article, he's thought of that. There is a trick with two registers in there that allows you to pivot from one bank to another. More explanation in the

Read the article, he's thought of that. There is a trick with two registers in there that allows you to pivot from one bank to another. More explanation in the appendix on the instruction set. The opcodes are 13, 23, eb and fb: http://www.laughtonelectronics.com/arcana/BrideOfSon%20KK%20Instruction%20List.html http://www.laughtonelectronics.com/arcana/BrideOfSon%20KK%20... Bottom of the list.