| 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 minus one (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 | ; Warm Boot Flags for BDA.wBoot
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| 129 | BOOT_FLAG_COLD EQU 0
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| 130 | BOOT_FLAG_WARM EQU 1234h ; Same effect as CTRL + ALT + DEL, skips memory tests
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| 131 | BOOT_FLAG_PRESERVE_RAM EQU 4321h ; No mem test, leave memory unchanged (AT+)
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| 132 |
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| 133 |
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| 134 | %endif ; BIOSDATA_INC
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