; Project name : XTIDE Universal BIOS ; Description : Equates for BIOS Data Area. %ifndef BIOSDATA_INC %define BIOSDATA_INC ;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; BIOS DATA AREA VARIABLES ; ;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; BIOS Data Area (related to floppy drives and hard disks) struc BDA resb 400h ; 40:0h, Start of BDA .wCOM1 resb 2 ; 0:400h, Serial I/O Address, Port 1 .wCOM2 resb 2 ; 0:402h, Serial I/O Address, Port 2 .wCOM3 resb 2 ; 0:404h, Serial I/O Address, Port 3 .wCOM4 resb 2 ; 0:406h, Serial I/O Address, Port 4 .wLPT1 resb 2 ; 0:408h, Parallel I/O Address, Port 1 .wLPT2 resb 2 ; 0:40Ah, Parallel I/O Address, Port 2 .wLPT3 resb 2 ; 0:40Ch, Parallel I/O Address, Port 3 .wLPT4: ; 0:40Eh, Parallel I/O Address, Port 4 (PC/XT) .wSegEBDA resb 2 ; 0:40Eh, Extended BIOS Data Area segment (AT+) .wEquipment resb 2 ; 0:410h, Equipment Word .bTest resb 1 ; 0:412h, Manufacturing test .wBaseMem resb 2 ; 0:413h, Base Memory Size in kB .wAdptrMem: ; 0:415h, Adapter Memory Size (PC/XT) .wError resb 2 ; 0:415h, Error Codes (AT+) .bKBFlgs1 resb 1 ; 0:417h, Keyboard, Shift Flags, Set 1 .bKBFlgs2 resb 1 ; 0:418h, Keyboard, Shift Flags, Set 2 .bKBNumpad resb 1 ; 0:419h, Keyboard, ALT+Numpad work area .wKBHead resb 2 ; 0:41Ah, Keyboard, Head of buffer pointer .wKBTail resb 2 ; 0:41Ch, Keyboard, Tail of buffer pointer .rgwKBBuff resb 32 ; 0:41Eh, Keyboard, 16-word buffer .bFDRecal resb 1 ; 0:43Eh, Diskette, Recalibrate status .bFDMotor resb 1 ; 0:43Fh, Diskette, Motor status .bFDMotTime resb 1 ; 0:440h, Diskette, Motor timeout counter .bFDRetST resb 1 ; 0:441h, Diskette, Controller status return code .rgbFDStatus resb 7 ; 0:442h, Diskette, Diskette and Disk Controller status bytes .bVidMode resb 1 ; 0:449h, Video, Mode .wVidColumns resb 2 ; 0:44Ah, Video, Number of columns .wVidBpP resb 2 ; 0:44Ch, Video, Total number of bytes per page .wVidPageOff resb 2 ; 0:44Eh, Video, Current page offset .rgwVidCurPos resb 16 ; 0:450h, Video, Cursor position, pages 0...7 .wVidCurShape resb 2 ; 0:460h, Video, Cursor shape .bVidPageIdx resb 1 ; 0:462h, Video, Active display page .wVidPort resb 2 ; 0:463h, Video, I/O Port number base .bVidModeReg resb 1 ; 0:465h, Video, Internal mode register .bVidPalette resb 1 ; 0:466h, Video, Color palette .wCasTimeCnt: ; 0:467h, Cassette, Time count at data edge (PC) .wGenOff resb 2 ; 0:467h, General use offset (XT+) .wCasCRC: ; 0:469h, Cassette, CRC register (PC) .wGenSeg resb 2 ; 0:469h, General use segment (XT+) .bCasLast: ; 0:46Bh, Cassette, Last value read .bLastIRQ resb 1 ; 0:46Bh, Last interrupt that occurred (XT+) .dwTimerTicks resb 4 ; 0:46Ch, Timer ticks count .bTimer24h resb 1 ; 0:470h, Timer ticks rollover flag .bKBCtrlBrk resb 1 ; 0:471h, Keyboard, Ctrl+Break flag .wBoot resb 2 ; 0:472h, Warm boot flag .bHDLastSt resb 1 ; 0:474h, Hard Disk, Status of Last Operation (XT+) .bHDCount resb 1 ; 0:475h, Hard Disk, Number of HDs Attached (XT+) .bHDCtrl resb 1 ; 0:476h, Hard Disk, Control Byte (temp, XT+) .bHDPortOff resb 1 ; 0:477h, Hard Disk, Port Offset (XT) .bLPT1Timeout resb 1 ; 0:478h, Parallel Printer 1, Timeout (XT+) .bLPT2Timeout resb 1 ; 0:479h, Parallel Printer 2, Timeout (XT+) .bLPT3Timeout resb 1 ; 0:47Ah, Parallel Printer 3, Timeout (XT+) .bLPT4Timeout resb 1 ; 0:47Bh, Parallel Printer 4, Timeout (XT+) .bCOM1Timeout resb 1 ; 0:47Ch, Serial 1, Timeout (XT+) .bCOM2Timeout resb 1 ; 0:47Dh, Serial 2, Timeout (XT+) .bCOM3Timeout resb 1 ; 0:47Eh, Serial 3, Timeout (XT+) .bCOM4Timeout resb 1 ; 0:47Fh, Serial 4, Timeout (XT+) .wKBPtrStart resb 2 ; 0:480h, Keyboard, Pointer to start of buffer (XT+) .wKBPtrEnd resb 2 ; 0:482h, Keyboard, Pointer to end of buffer (XT+) .bVidRows resb 1 ; 0:484h, Video, Number of rows minus one (EGA+) .wVidPpC resb 2 ; 0:485h, Video, Pixels per character (EGA+) .bVidOptns resb 1 ; 0:487h, Video, Options (EGA+) .bVidSwitches resb 1 ; 0:488h, Video, Switches (EGA+) .bVidSave1 resb 1 ; 0:489h, Video, Save area 1 (VGA+) .bVidSave2 resb 1 ; 0:48Ah, Video, Save area 2 (VGA+) .bFDCfgData resb 1 ; 0:48Bh, Diskette, Configuration data (AT+) .bHDStatus resb 1 ; 0:48Ch, Hard Disk, Status Register (AT+) .bHDError resb 1 ; 0:48Dh, Hard Disk, Error Register (AT+) .bHDTaskFlg resb 1 ; 0:48Eh, Hard Disk, Task Complete Flag (AT+) .bFDCtrlInfo resb 1 ; 0:48Fh, Diskette, Controller information (AT+) .bFDMedia0 resb 1 ; 0:490h, Diskette 0, Media state (AT+) .bFDMedia1 resb 1 ; 0:491h, Diskette 1, Media state (AT+) .bFDOpStart0 resb 1 ; 0:492h, Diskette 0, Operational starting state (AT+) .bFDOpStart1 resb 1 ; 0:493h, Diskette 1, Operational starting state (AT+) .bFDCurCyl0 resb 1 ; 0:494h, Diskette 0, Current cylinder (AT+) .bFDCurCyl1 resb 1 ; 0:495h, Diskette 1, Current cylinder (AT+) .bKBFlgs3 resb 1 ; 0:496h, Keyboard, Status flags 3 (AT+) .bKBFlgs4 resb 1 ; 0:497h, Keyboard, Status flags 4 (AT+) .dwWaitPtr resb 4 ; 0:498h, User's wait flag pointer (AT+) .dwWaitCnt resb 4 ; 0:49Ch, User's wait count (AT+) .bWaitFlg resb 1 ; 0:4A0h, Wait flag (AT+) .rgbLAN resb 7 ; 0:4A1h, Local Area Network (AT+) .dwVidPtr resb 4 ; 0:4A8h, Video, Parameter Control Block Pointer (EGA+) resb 22h ; Reserved from 0:4ACh...0:4CDh .dwDays resb 4 ; 0:4CEh, Clock, Days since 1980 (some BIOSes, AT+) resb 2Eh ; Reserved from 0:4D2h...0:4FFh .bPrntScrn resb 1 ; 0:500, Print screen status endstruc ; BDA struct with only Hard Disk related locations struc HDBDA resb 474h .bHDLastSt resb 1 ; 0:474h, Status of Last Operation (XT+) .bHDCount resb 1 ; 0:475h, Number of HDs Attached (XT+) .bHDCtrl resb 1 ; 0:476h, Control Byte (temp, XT+) .bHDPortOff resb 1 ; 0:477h, Port Offset (XT) resb 15h .bHDStatus: ; 0:48Ch, Status Register (AT+) .bHDError: ; 0:48Dh, Error Register (AT+) .wHDStAndErr resb 2 .bHDTaskFlg resb 1 ; 0:48Eh, Task Complete Flag (AT+) endstruc ; Warm Boot Flags for BDA.wBoot BOOT_FLAG_COLD EQU 0 BOOT_FLAG_WARM EQU 1234h ; Same effect as CTRL + ALT + DEL, skips memory tests BOOT_FLAG_PRESERVE_RAM EQU 4321h ; No mem test, leave memory unchanged (AT+) %endif ; BIOSDATA_INC