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diff --git a/private/ntos/inc/duodef.h b/private/ntos/inc/duodef.h
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+++ b/private/ntos/inc/duodef.h
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+/*++ BUILD Version: 0005    // Increment this if a change has global effects
+
+Copyright (c) 1990  Microsoft Corporation
+
+Module Name:
+
+    duodef.h
+
+Abstract:
+
+    This module is the header file that describes hardware addresses
+    for the Duo system.
+
+Author:
+
+    Lluis Abello (lluis)  7-Apr-1993
+
+Revision History:
+
+--*/
+
+#ifndef _DUODEF_
+#define _DUODEF_
+
+//
+// Define physical base addresses for system mapping.
+//
+
+#define VIDEO_MEMORY_PHYSICAL_BASE 0x40000000 // physical base of video memory
+#define VIDEO_CONTROL_PHYSICAL_BASE 0x60000000 // physical base of video control
+#define CURSOR_CONTROL_PHYSICAL_BASE 0x60008000 // physical base of cursor control
+#define VIDEO_ID_PHYSICAL_BASE 0x60010000 // physical base of video id register
+#define VIDEO_RESET_PHYSICAL_BASE 0x60020000 // physical base of reset register
+#define DEVICE_PHYSICAL_BASE 0x80000000 // physical base of device space
+#define NET_PHYSICAL_BASE 0x80001000    // physical base of ethernet control
+#define SCSI1_PHYSICAL_BASE 0x80002000  // physical base of SCSI1 control
+#define SCSI2_PHYSICAL_BASE 0x80003000  // physical base of SCSI2 control
+#define RTCLOCK_PHYSICAL_BASE 0x80004000 // physical base of realtime clock
+#define KEYBOARD_PHYSICAL_BASE 0x80005000 // physical base of keyboard control
+#define MOUSE_PHYSICAL_BASE 0x80005000  // physical base of mouse control
+#define SERIAL0_PHYSICAL_BASE 0x80006000 // physical base of serial port 0
+#define SERIAL1_PHYSICAL_BASE 0x80007000 // physical base of serial port 1
+#define PARALLEL_PHYSICAL_BASE 0x80008000 // physical base of parallel port
+#define EISA_CONTROL_PHYSICAL_BASE 0x90000000 // physical base of EISA control
+#define EISA_MEMORY_PHYSICAL_BASE 0x91000000 // physical base of EISA memory
+#define EISA_MEMORY_VERSION2_LOW 0x00000000 // physical base of EISA memory
+#define EISA_MEMORY_VERSION2_HIGH 0x00000001 // with version 2 address chip
+#define PROM_PHYSICAL_BASE 0xfff00000   // physical base of boot PROM
+#define EEPROM_PHYSICAL_BASE 0xfff40000 // physical base of FLASH PROM
+
+//
+// Define virtual/physical base addresses for system mapping.
+//
+
+#define NVRAM_VIRTUAL_BASE 0xffff8000   // virtual base of nonvolatile RAM
+#define NVRAM_PHYSICAL_BASE 0x80009000  // physical base of nonvolatile RAM
+
+#define SP_VIRTUAL_BASE 0xffffa000      // virtual base of serial port 0
+#define SP_PHYSICAL_BASE SERIAL0_PHYSICAL_BASE // physical base of serial port 0
+
+#define DMA_VIRTUAL_BASE 0xffffc000     // virtual base of DMA control
+#define DMA_PHYSICAL_BASE DEVICE_PHYSICAL_BASE // physical base of DMA control
+
+#define INTERRUPT_VIRTUAL_BASE 0xffffd000 // virtual base of interrupt source
+#define INTERRUPT_PHYSICAL_BASE 0x8000f000 // physical base of interrupt source
+
+//
+// Define the size of the DMA translation table.
+//
+#define DMA_TRANSLATION_LIMIT 0x2000    // translation table limit
+
+//
+// Define the maximum number of map registers allowed per allocation.
+//
+
+#define DMA_REQUEST_LIMIT (DMA_TRANSLATION_LIMIT/(sizeof(TRANSLATION_ENTRY) * 8))
+
+//
+// Define pointer to DMA control registers.
+//
+
+#define DMA_CONTROL ((volatile PDMA_REGISTERS)(DMA_VIRTUAL_BASE))
+
+//
+// Define DMA channel interrupt level.
+//
+
+#define DMA_LEVEL       3
+
+//
+// Define the minimum and maximum system time increment values in 100ns units.
+//
+
+#define MAXIMUM_INCREMENT (10 * 1000 * 10)
+#define MINIMUM_INCREMENT (1 * 1000 * 10)
+
+//
+// Define Duo clock level.
+//
+
+#define CLOCK_LEVEL 6                   // Interval clock level
+#define CLOCK_INTERVAL ((MAXIMUM_INCREMENT / (10 * 1000)) - 1) // Ms minus 1
+#define CLOCK2_LEVEL CLOCK_LEVEL        //
+
+//
+// Define EISA device level.
+//
+
+#define EISA_DEVICE_LEVEL  5            // EISA bus interrupt level
+
+//
+// Define EISA device interrupt vectors.
+//
+
+#define EISA_VECTORS 32
+
+#define IRQL10_VECTOR (10 + EISA_VECTORS) // Eisa interrupt request level 10
+#define IRQL11_VECTOR (11 + EISA_VECTORS) // Eisa interrupt request level 11
+#define IRQL12_VECTOR (12 + EISA_VECTORS) // Eisa interrupt request level 12
+#define IRQL13_VECTOR (13 + EISA_VECTORS) // Eisa interrupt request level 13
+
+#define MAXIMUM_EISA_VECTOR (15 + EISA_VECTORS) // maximum EISA vector
+
+//
+// Define I/O device interrupt level.
+//
+
+#define DEVICE_LEVEL 4                  // I/O device interrupt level
+
+//
+// Define device interrupt vectors.
+//
+
+#define DEVICE_VECTORS 16               // starting builtin device vector
+
+#define PARALLEL_VECTOR (1 + DEVICE_VECTORS) // Parallel device interrupt vector
+#define VIDEO_VECTOR (3 + DEVICE_VECTORS) // video device interrupt vector
+#define NET_VECTOR (4 + DEVICE_VECTORS)  // ethernet device interrupt vector
+#define SCSI1_VECTOR (5 + DEVICE_VECTORS) // SCSI device interrupt vector
+#define SCSI2_VECTOR (6 + DEVICE_VECTORS) // SCSI device interrupt vector
+#define KEYBOARD_VECTOR (7 + DEVICE_VECTORS) // Keyboard device interrupt vector
+#define MOUSE_VECTOR (8 + DEVICE_VECTORS) // Mouse device interrupt vector
+#define SERIAL0_VECTOR (9 + DEVICE_VECTORS) // Serial device 0 interrupt vector
+#define SERIAL1_VECTOR (10 + DEVICE_VECTORS) // Serial device 1 interrupt vector
+
+#define MAXIMUM_BUILTIN_VECTOR SERIAL1_VECTOR // maximum builtin vector
+
+//
+// Define the clock speed in megahetz for the SCSI protocol chips.
+//
+
+#define NCR_SCSI_CLOCK_SPEED 24
+
+//
+// PROM entry point definitions.
+//
+// Define base address of prom entry vector and prom entry macro.
+//
+
+#define PROM_BASE (KSEG1_BASE | 0x1fc00000)
+#define PROM_ENTRY(x) (PROM_BASE + ((x) * 8))
+
+#endif // _DUODEF_