Compaq 470007-802 Deskpro EN Series of Personal Computers - Slim Desktop Model - Page 78

ICH Fixed I/O Registers cont Port Register Name A0h A1 A4h-A5h, A8h-A8h, ACh-ADh, B0h-B1h, B4h-B5h, B8h-B9h, BCh-BDh B2h B3h C0h, C4h, C8h, CCh C1h C5h C9h CDh C2h, C6h, CAh, CEh C3h C7h CBh CFh D0h D1h D4h D5h D6h D7h D8h D9h DAh DBh DCh DEh DEh DFh F0h 170h-177h 1F0h-1F7h 376h Slave PIC ICW1 Init. Cmd Word 1 Register Slave PIC OCW2 Op Ctrl Word 2 Register Slave PIC OCW3 Op Ctrl Word 3 Register 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 Aliased at A0h-A1h Advanced Power Management Control Port Register Advanced Power Management Status Port Register Channel 4, 5, 6, 7 DMA Base and Current Address Register Aliased at C0h Aliased at C4h Aliased at C8h Aliased at CCh Channel 4, 5, 6, 7 DMA Base and Current Count Register Aliased at C2h Aliased at C6h Aliased at CAh Aliased at Ceh Channel 4-7 DMA Command Register Channel 4-7 DMA Status Register Aliased at D0h Channel 4-7 DMA Write Single Mask Register Aliased at D4h Channel 4-7 DMA Channel Mode Register Aliased at D6h Channel 4-7 DMA Clear Byte Pointer Register Aliased at D8h Channel 4-7 DMA Master Clear Register Aliased at DAh Channel 4-7 DMA Clear Mask Register Aliased at DCh Channel 4-7 DMA Write All Mask Register Aliased at DEh Coprocessor Error Register PIO Mode Command Block Offset for Secondary Drive PIO Mode Command Block Offset for Primary Drive PIO Mode Control Block Offset for Secondary Drive continued 6-4 Specifications