HP Workstation x1100 hp workstation x1100 - technical reference guide - Page 67
DMA Channel Controllers, <TABLE>, BIOS Addresses,
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Chapter 3 HP BIOS BIOS Addresses Default Values for I/O Address Ports 0020 - 0021 002E - 002F 0040 - 0043 0060, 0064 0061 0070 0070 - 0071 0080 0081 - 0083, 008F 0092 00A0 - 00A1 00C0 - 00DF 00F0 - 00FF 0170 - 0177 01F0 - 01F7 0278 - 027F 02E8 - 02EF 02F8 - 02FF 0372 - 0377 0378 - 037F 03B0 - 03DF 03E8 - 03EF 03F0 - 03F5 03F6 03F7 03F8 - 03FF 04D0 - 04D1 0778 - 077F 0CF8 - 0CFF C000 C100 - C10F Function Master interrupt controller (8259) Super I/O Timer 1 Keyboard controller (reset, slow A20) Port B (speaker, NMI status, and control) Bit 7: NMI mask register RTC and CMOS Manufacturing port (POST card) DMA low page register PS/2 reset and Fast A20 Slave interrupt controller DMA controller 2 Coprocessor error Free (IDE secondary channel) IDE primary channel LPT 2 Serial port 4 (COM4) Serial port 2 (COM2) Free (IDE secondary channel, secondary floppy disk drive) LPT1 VGA COM3 Floppy disk drive controller IDE primary channel Floppy disk drive controller COM1 Interrupt edge/level control LPT1 ECP PCI configuration space Power management I/O space and ACPI registers SMBus I/O space DMA Channel Controllers The system permits only I/O-to-memory and memory-to-I/O transfers. The hardware configuration doesn't allow I/O-to-I/O or memory-to-memory transfers. The system controller supports seven DMA channels, each with a page register that extends the channel's addressing range to 16MB. The following table shows how the system allocates DMA channels. Channel DMA 0 DMA 1 DMA controller Function Free Free if not used for parallel port in Setup 67