1 | ; Project name : XTIDE Universal BIOS |
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2 | ; Description : Equates for BIOS Data Area. |
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3 | %ifndef BIOSDATA_INC |
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4 | %define BIOSDATA_INC |
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5 | |
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6 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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7 | ; BIOS DATA AREA VARIABLES ; |
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8 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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9 | |
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10 | ; BIOS Data Area (related to floppy drives and hard disks) |
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11 | struc BDA |
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12 | resb 400h ; 40:0h, Start of BDA |
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13 | .wCOM1 resb 2 ; 0:400h, Serial I/O Address, Port 1 |
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14 | .wCOM2 resb 2 ; 0:402h, Serial I/O Address, Port 2 |
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15 | .wCOM3 resb 2 ; 0:404h, Serial I/O Address, Port 3 |
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16 | .wCOM4 resb 2 ; 0:406h, Serial I/O Address, Port 4 |
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17 | .wLPT1 resb 2 ; 0:408h, Parallel I/O Address, Port 1 |
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18 | .wLPT2 resb 2 ; 0:40Ah, Parallel I/O Address, Port 2 |
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19 | .wLPT3 resb 2 ; 0:40Ch, Parallel I/O Address, Port 3 |
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20 | .wLPT4: ; 0:40Eh, Parallel I/O Address, Port 4 (PC/XT) |
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21 | .wSegEBDA resb 2 ; 0:40Eh, Extended BIOS Data Area segment (AT+) |
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22 | |
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23 | .wEquipment resb 2 ; 0:410h, Equipment Word |
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24 | .bTest resb 1 ; 0:412h, Manufacturing test |
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25 | .wBaseMem resb 2 ; 0:413h, Base Memory Size in kB |
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26 | .wAdptrMem: ; 0:415h, Adapter Memory Size (PC/XT) |
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27 | .wError resb 2 ; 0:415h, Error Codes (AT+) |
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28 | .bKBFlgs1 resb 1 ; 0:417h, Keyboard, Shift Flags, Set 1 |
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29 | .bKBFlgs2 resb 1 ; 0:418h, Keyboard, Shift Flags, Set 2 |
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30 | .bKBNumpad resb 1 ; 0:419h, Keyboard, ALT+Numpad work area |
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31 | .wKBHead resb 2 ; 0:41Ah, Keyboard, Head of buffer pointer |
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32 | .wKBTail resb 2 ; 0:41Ch, Keyboard, Tail of buffer pointer |
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33 | .rgwKBBuff resb 32 ; 0:41Eh, Keyboard, 16-word buffer |
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34 | |
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35 | .bFDRecal resb 1 ; 0:43Eh, Diskette, Recalibrate status |
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36 | .bFDMotor resb 1 ; 0:43Fh, Diskette, Motor status |
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37 | |
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38 | .bFDMotTime resb 1 ; 0:440h, Diskette, Motor timeout counter |
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39 | .bFDRetST resb 1 ; 0:441h, Diskette, Controller status return code |
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40 | .rgbFDStatus resb 7 ; 0:442h, Diskette, Diskette and Disk Controller status bytes |
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41 | .bVidMode resb 1 ; 0:449h, Video, Mode |
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42 | .wVidColumns resb 2 ; 0:44Ah, Video, Number of columns |
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43 | .wVidBpP resb 2 ; 0:44Ch, Video, Total number of bytes per page |
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44 | .wVidPageOff resb 2 ; 0:44Eh, Video, Current page offset |
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45 | |
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46 | .rgwVidCurPos resb 16 ; 0:450h, Video, Cursor position, pages 0...7 |
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47 | |
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48 | .wVidCurShape resb 2 ; 0:460h, Video, Cursor shape |
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49 | .bVidPageIdx resb 1 ; 0:462h, Video, Active display page |
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50 | .wVidPort resb 2 ; 0:463h, Video, I/O Port number base |
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51 | .bVidModeReg resb 1 ; 0:465h, Video, Internal mode register |
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52 | .bVidPalette resb 1 ; 0:466h, Video, Color palette |
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53 | .wCasTimeCnt: ; 0:467h, Cassette, Time count at data edge (PC) |
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54 | .wGenOff resb 2 ; 0:467h, General use offset (XT+) |
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55 | .wCasCRC: ; 0:469h, Cassette, CRC register (PC) |
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56 | .wGenSeg resb 2 ; 0:469h, General use segment (XT+) |
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57 | .bCasLast: ; 0:46Bh, Cassette, Last value read |
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58 | .bLastIRQ resb 1 ; 0:46Bh, Last interrupt that occurred (XT+) |
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59 | .dwTimerTicks resb 4 ; 0:46Ch, Timer ticks count |
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60 | |
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61 | .bTimer24h resb 1 ; 0:470h, Timer ticks rollover flag |
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62 | .bKBCtrlBrk resb 1 ; 0:471h, Keyboard, Ctrl+Break flag |
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63 | .wBoot resb 2 ; 0:472h, Warm boot flag |
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64 | .bHDLastSt resb 1 ; 0:474h, Hard Disk, Status of Last Operation (XT+) |
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65 | .bHDCount resb 1 ; 0:475h, Hard Disk, Number of HDs Attached (XT+) |
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66 | .bHDCtrl resb 1 ; 0:476h, Hard Disk, Control Byte (temp, XT+) |
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67 | .bHDPortOff resb 1 ; 0:477h, Hard Disk, Port Offset (XT) |
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68 | .bLPT1Timeout resb 1 ; 0:478h, Parallel Printer 1, Timeout (XT+) |
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69 | .bLPT2Timeout resb 1 ; 0:479h, Parallel Printer 2, Timeout (XT+) |
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70 | .bLPT3Timeout resb 1 ; 0:47Ah, Parallel Printer 3, Timeout (XT+) |
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71 | .bLPT4Timeout resb 1 ; 0:47Bh, Parallel Printer 4, Timeout (XT+) |
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72 | .bCOM1Timeout resb 1 ; 0:47Ch, Serial 1, Timeout (XT+) |
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73 | .bCOM2Timeout resb 1 ; 0:47Dh, Serial 2, Timeout (XT+) |
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74 | .bCOM3Timeout resb 1 ; 0:47Eh, Serial 3, Timeout (XT+) |
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75 | .bCOM4Timeout resb 1 ; 0:47Fh, Serial 4, Timeout (XT+) |
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76 | |
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77 | .wKBPtrStart resb 2 ; 0:480h, Keyboard, Pointer to start of buffer (XT+) |
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78 | .wKBPtrEnd resb 2 ; 0:482h, Keyboard, Pointer to end of buffer (XT+) |
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79 | .bVidRows resb 1 ; 0:484h, Video, Number of rows (EGA+) |
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80 | .wVidPpC resb 2 ; 0:485h, Video, Pixels per character (EGA+) |
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81 | .bVidOptns resb 1 ; 0:487h, Video, Options (EGA+) |
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82 | .bVidSwitches resb 1 ; 0:488h, Video, Switches (EGA+) |
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83 | .bVidSave1 resb 1 ; 0:489h, Video, Save area 1 (VGA+) |
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84 | .bVidSave2 resb 1 ; 0:48Ah, Video, Save area 2 (VGA+) |
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85 | .bFDCfgData resb 1 ; 0:48Bh, Diskette, Configuration data (AT+) |
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86 | .bHDStatus resb 1 ; 0:48Ch, Hard Disk, Status Register (AT+) |
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87 | .bHDError resb 1 ; 0:48Dh, Hard Disk, Error Register (AT+) |
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88 | .bHDTaskFlg resb 1 ; 0:48Eh, Hard Disk, Task Complete Flag (AT+) |
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89 | .bFDCtrlInfo resb 1 ; 0:48Fh, Diskette, Controller information (AT+) |
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90 | |
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91 | .bFDMedia0 resb 1 ; 0:490h, Diskette 0, Media state (AT+) |
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92 | .bFDMedia1 resb 1 ; 0:491h, Diskette 1, Media state (AT+) |
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93 | .bFDOpStart0 resb 1 ; 0:492h, Diskette 0, Operational starting state (AT+) |
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94 | .bFDOpStart1 resb 1 ; 0:493h, Diskette 1, Operational starting state (AT+) |
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95 | .bFDCurCyl0 resb 1 ; 0:494h, Diskette 0, Current cylinder (AT+) |
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96 | .bFDCurCyl1 resb 1 ; 0:495h, Diskette 1, Current cylinder (AT+) |
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97 | .bKBFlgs3 resb 1 ; 0:496h, Keyboard, Status flags 3 (AT+) |
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98 | .bKBFlgs4 resb 1 ; 0:497h, Keyboard, Status flags 4 (AT+) |
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99 | .dwWaitPtr resb 4 ; 0:498h, User's wait flag pointer (AT+) |
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100 | .dwWaitCnt resb 4 ; 0:49Ch, User's wait count (AT+) |
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101 | |
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102 | .bWaitFlg resb 1 ; 0:4A0h, Wait flag (AT+) |
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103 | .rgbLAN resb 7 ; 0:4A1h, Local Area Network (AT+) |
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104 | .dwVidPtr resb 4 ; 0:4A8h, Video, Parameter Control Block Pointer (EGA+) |
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105 | resb 22h ; Reserved from 0:4ACh...0:4CDh |
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106 | |
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107 | .dwDays resb 4 ; 0:4CEh, Clock, Days since 1980 (some BIOSes, AT+) |
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108 | resb 2Eh ; Reserved from 0:4D2h...0:4FFh |
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109 | |
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110 | .bPrntScrn resb 1 ; 0:500, Print screen status |
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111 | endstruc |
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112 | |
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113 | ; BDA struct with only Hard Disk related locations |
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114 | struc HDBDA |
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115 | resb 474h |
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116 | .bHDLastSt resb 1 ; 0:474h, Status of Last Operation (XT+) |
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117 | .bHDCount resb 1 ; 0:475h, Number of HDs Attached (XT+) |
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118 | .bHDCtrl resb 1 ; 0:476h, Control Byte (temp, XT+) |
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119 | .bHDPortOff resb 1 ; 0:477h, Port Offset (XT) |
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120 | resb 15h |
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121 | .bHDStatus: ; 0:48Ch, Status Register (AT+) |
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122 | .bHDError: ; 0:48Dh, Error Register (AT+) |
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123 | .wHDStAndErr resb 2 |
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124 | .bHDTaskFlg resb 1 ; 0:48Eh, Task Complete Flag (AT+) |
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125 | endstruc |
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126 | |
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127 | |
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128 | %endif ; BIOSDATA_INC |
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