These instructions are encoded in little-endian (LSB byte first). They must be located in Base 64k RAM and aligned to word boundary (the address of first byte must be even).
4xxxh instruction Instruction codes 4xxxh are partially decoded by the DMA controller. For example, the instruction code CFCFh is equivalent to 4001h.
Each DMA channel fetch one 16-bit instruction during horizontal retrace time. Once the 3 instructions have been captured, they are then executed sequentially.