Configuration Space Command Register

bits 15:9 = reserved

bit 10 = Interrupt Disable

bit 9 = Fast Back-to-Back Enable

bit 8 = SERR# Enable

bit 7 = Stepping Control

bit 6 = Parity Error Response

bit 5 = VGA Palette Snoop

bit 4 = Memory Write and Invalidate Enable

bit 3 = Special Cycles

bit 2 = Bus Master

bit 1 = Memory Space

bit 0 = I/O Space