Compaq 470007-802 Deskpro EN Series of Personal Computers Maintenance and Serv - Page 91

ICH Fixed I/O Registers cont Port Register Name CF9h Reset Control Register A0h Slave PIC ICW1 Init. Cmd Word 1 Register Slave PIC OCW2 Op Ctrl Word 2 Register Slave PIC OCW3 Op Ctrl Word 3 Register A1 Slave PIC ICW2 Init. Cmd Word 2 Register Slave PIC ICW3 Init. Cmd Word 3 Register Slave PIC ICW4 Init. Cmd Word 4 Register Slave PIC OCW1 Op Ctrl Word 1 Register A4h-A5h, A8h-A8h, ACh-ADh, B0h-B1h, B4h-B5h, B8h-B9h, BCh-BDh Aliased at A0h-A1h B2h Advanced Power Management Control Port Register B3h Advanced Power Management Status Port Register C0h, C4h, C8h, CCh Channel 4, 5, 6, 7 DMA Base and Current Address Register C1h Aliased at C0h C5h Aliased at C4h C9h Aliased at C8h CDh Aliased at CCh C2h, C6h, CAh, CEh Channel 4, 5, 6, 7 DMA Base and Current Count Register C3h Aliased at C2h C7h Aliased at C6h CBh Aliased at CAh CFh Aliased at Ceh D0h Channel 4-7 DMA Command Register Channel 4-7 DMA Status Register D1h Aliased at D0h D4h Channel 4-7 DMA Write Single Mask Register D5h Aliased at D4h D6h Channel 4-7 DMA Channel Mode Register D7h Aliased at D6h D8h Channel 4-7 DMA Clear Byte Pointer Register D9h Aliased at D8h DAh Channel 4-7 DMA Master Clear Register DBh Aliased at DAh DCh Channel 4-7 DMA Clear Mask Register DEh Aliased at DCh DEh Channel 4-7 DMA Write All Mask Register DFh Aliased at DEh F0h Coprocessor Error Register 170h-177h PIO Mode Command Block Offset for Secondary Drive continued 6-4 Specifications