with DOS/4GW? - Open Watcom

Table of Contents
5.6 How Can I Use the Mouse Interrupt (0x33) with DOS/4GW? .................... 33
5.7 How Do I Simulate a Real-Mode Interrupt with DOS/4GW? ...................... 35
5.8 How do you install a bi-modal interrupt handler using DOS/4GW? ........... 37
The DOS/4GW DOS Extender .................................................................................................. 43
6 The Tenberry Software DOS/4GW DOS Extender .................................................... 45
7 Linear Executables ...................................................................................................... 47
7.1 The Linear Executable Format ..................................................................... 47
7.1.1 The Stub Program .......................................................................... 47
7.2 Memory Use ................................................................................................. 49
8 Configuring DOS/4GW .............................................................................................. 51
8.1 The DOS4G Environment Variable .............................................................. 51
8.2 Changing the Switch Mode Setting .............................................................. 52
8.3 Fine Control of Memory Usage .................................................................... 54
8.3.1 Specifying a Range of Extended Memory ..................................... 54
8.3.2 Using Extra Memory ...................................................................... 56
8.4 Setting Runtime Options .............................................................................. 56
8.5 Controlling Address Line 20 ........................................................................ 58
9 VMM ........................................................................................................................... 59
9.1 VMM Default Parameters ............................................................................. 59
9.2 Changing the Defaults .................................................................................. 60
9.2.1 The .VMC File ............................................................................... 60
10 Interrupt 21H Functions ............................................................................................ 61
10.1 Functions 25H and 35H: Interrupt Handling in Protected Mode ............... 65
10.1.1 32-Bit Gates ................................................................................. 65
10.1.2 Chaining 16-bit and 32-bit Handlers ............................................ 66
10.1.3 Getting the Address of the Interrupt Handler ............................... 66
11 Interrupt 31H DPMI Functions ................................................................................. 67
11.1 Using Interrupt 31H Function Calls ........................................................... 67
11.2 Int31H Function Calls ................................................................................ 68
11.2.1 Local Descriptor Table (LDT) Management Services ................. 69
11.2.2 DOS Memory Management Services ........................................... 75
11.2.3 Interrupt Services ......................................................................... 76
11.2.4 Translation Services ..................................................................... 79
11.2.5 DPMI Version .............................................................................. 88
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