/*** VDMBIOS.H
*
* For include file hierarchy, see MVDM.H
*/
/***ET+ Low memory/ROM and EBIOS defines - used by VBIOS */
/* c-begin */
#define ROMDATA_START (IVT_START+IVT_LEN)
#define ROMDATA_LEN 0x101 /* sizeof(ROMDATA)-IVT_LEN */
#define ROMBIOS_START 0xF0000
#define ROMBIOS_LEN 0x10000
#define ROMBIOS_PAGES PAGESFROMBYTES(ROMBIOS_LEN)
#define PS2BIOS_START 0xE0000
#define PS2BIOS_LEN 0x20000
#define PS2BIOS_PAGES PAGESFROMBYTES(PS2BIOS_LEN)
#define EXTROM_START 0xC0000 /* where and how far to */
#define EXTROM_LEN 0x40000 /* search for external adapter ROMs */
#define EXTROM_PAGES PAGESFROMBYTES(EXTROM_LEN)
#define EBIOSDATA_START 0x9FC00
#define EBIOSDATA_LEN 0x00400
#define EBIOSDATA_PAGES PAGESFROMBYTES(EBIOSDATA_LEN)
#if ROMDATA_START != IVT_START+IVT_LEN
#error ROMDATA_START not equal to IVT_START+IVT_LEN
#endif
#if defined(IVT_START) && defined(DCA_START)
#if DCA_START != ROMDATA_START+ROMDATA_LEN
#error DCA_START not equal to ROMDATA_START+ROMDATA_LEN
#endif
#define LOWMEM_START IVT_START
#define LOWMEM_LEN (IVT_LEN+ROMDATA_LEN+DCA_LEN)
#define LOWMEM_COPYLEN (IVT_LEN+ROMDATA_LEN)
#define LOWMEM_PAGES PAGESFROMBYTES(LOWMEM_LEN)
#endif
/* c-end */
/*end*/
/*** BIOS Interrupt Vectors
*/
#define BIOSINT_PARITYCHECK 0x02
#define BIOSINT_PRINTSCREEN 0x05
#define BIOSINT_TIMERINTERRUPT 0x08
#define BIOSINT_KEYINTERRUPT 0x09
#define BIOSINT_COM2INTERRUPT 0x0B
#define BIOSINT_COM1INTERRUPT 0x0C
#define BIOSINT_LPT2INTERRUPT 0x0D
#define BIOSINT_FLOPPYINTERRUPT 0x0E
#define BIOSINT_LPT1INTERRUPT 0x0F
#define BIOSINT_VIDEO 0x10
#define BIOSINT_EQUIPMENTCHECK 0x11
#define BIOSINT_MEMORYCHECK 0x12
#define BIOSINT_DISKIO 0x13
#define BIOSINT_COMIO 0x14
#define BIOSINT_OSHOOK 0x15
#define BIOSINT_KEYBOARD 0x16
#define BIOSINT_PRINTERIO 0x17
#define BIOSINT_ROMBASIC 0x18
#define BIOSINT_REBOOT 0x19
#define BIOSINT_TIMEOFDAY 0x1A
#define BIOSINT_KEYBREAK 0x1B
#define BIOSINT_CLOCKTICK 0x1C
#define BIOSINT_VIDEOPARMS 0x1D
#define BIOSINT_DISKPARMS 0x1E
#define BIOSINT_VIDEOGRAPH 0x1F
#define BIOSINT_OLDDISKIO 0x40
#define BIOSINT_HDISK1PARMS 0x41
#define BIOSINT_OLDVIDEO 0x42
#define BIOSINT_EXTVIDEOGRAPH 0x43
#define BIOSINT_HDISK2PARMS 0x46
/*** Int 10h Equates (AH values)
*/
#define INT10_SETMODE 0x00
#define INT10_SETCURSORTYPE 0x01
#define INT10_SETCURSORPOS 0x02
#define INT10_QUERYCURSORPOS 0x03
#define INT10_QUERYLPEN 0x04
#define INT10_SETACTIVEPAGE 0x05
#define INT10_SCROLLUP 0x06
#define INT10_SCROLLDOWN 0x07
#define INT10_READCHARATTR 0x08
#define INT10_WRITECHARATTR 0x09
#define INT10_WRITECHAR 0x0A
#define INT10_SETPALETTE 0x0B
#define INT10_WRITEPIXEL 0x0C
#define INT10_READPIXEL 0x0D
#define INT10_WRITETTY 0x0E
#define INT10_QUERYMODE 0x0F
#define INT10_EGASETPALETTE 0x10
#define INT10_EGASELECTFONT 0x11
#define INT10_EGASELECTMISC 0x12
#define INT10_EGAWRITESTRING 0x13
#define INT10_VGADISPLAYCODES 0x1A
#define INT10_VGAQUERYSTATE 0x1B
#define INT10_VGASAVERESTORE 0x1C
/*** Int 13h Equates (AH values)
*/
#define INT13_DISKRESET 0x00
#define INT13_DISKSTATUS 0x01
#define INT13_READSECTORS 0x02
#define INT13_WRITESECTORS 0x03
#define INT13_VERIFYSECTORS 0x04
#define INT13_FORMATTRACK 0x05
#define INT13_QUERYDRVPARMS 0x08
#define INT13_DISKSEEK 0x0C /* @235 */
#define INT13_QUERYDASDTYPE 0x15
#define INT13_QUERYCHANGE 0x16
#define INT13_SETDISKTYPE 0x17
#define INT13_SETMEDIATYPE 0x18
/*** Int 13h Status Equates (return in AH)
*/
#define INT13STATUS_SUCCESS 0x00 /* successful completion */
#define INT13STATUS_BADCMD 0x01 /* bad command */
#define INT13STATUS_BADADDRMARK 0x02 /* address mark not found */
#define INT13STATUS_WRTPROTECT 0x03 /* write on write-protected disk */
#define INT13STATUS_RECNOTFOUND 0x04 /* sector not found */
#define INT13STATUS_BADRESET 0x05 /* reset failed (HD) */
#define INT13STATUS_MEDIACHANGE 0x06 /* media changed */
#define INT13STATUS_INITFAIL 0x07 /* parm. act. failed (HD) */
#define INT13STATUS_BADDMA 0x08 /* DMA overrun */
#define INT13STATUS_DMABOUNDARY 0x09 /* DMA across 64K boundary */
#define INT13STATUS_BADSECTOR 0x0a /* bad sector detected (HD) */
#define INT13STATUS_BADTRACK 0x0b /* bad track detected (HD) */
#define INT13STATUS_BADMEDIATYPE 0x0c /* unsupported track (HD) */
#define INT13STATUS_BADFMTSECNUM 0x0d /* bad # of sectors on format (HD) */
#define INT13STATUS_ADDRMARKDET 0x0e /* ctrl data addr mark detected (HD */
#define INT13STATUS_DMAARBERR 0x0f /* DMA arbitration error (HD) */
#define INT13STATUS_BADCRCECC 0x10 /* bad CRC/ECC */
#define INT13STATUS_DATACORRECT 0x11 /* data ECC corrected */
#define INT13STATUS_BADCNTLR 0x20 /* controller failure */
#define INT13STATUS_BADSEEK 0x40 /* seek failed */
#define INT13STATUS_TIMEOUT 0x80 /* time out */
#define INT13STATUS_DRVNOTREADY 0xaa /* drive not ready (HD) */
#define INT13STATUS_UNDEFERR 0xbb /* undefined error (HD) */
#define INT13STATUS_WRITEFAULT 0xcc /* write fault (HD) */
#define INT13STATUS_STATUSERROR 0xe0 /* status register error (HD) */
#define INT13STATUS_SENSEFAIL 0xff /* sense operation failed (HD) */
/*** Int 15h Equates (AH values)
*/
#define INT15AH_KEYINTERCEPT 0x4f
#define INT15AH_KEYSYSREQ 0x85
#define INT15AH_DEVBUSY 0x90
#define INT15AH_INTCOMPLETE 0x91
/*** Int 15h Equates (AL values)
*/
#define INT15AL_DISKETTE 0x01
#define INT15AL_KEYBOARD 0x02
/*** Int 16h Equates (AH values)
*/
#define INT16_READCHAR 0x00
#define INT16_PEEKCHAR 0x01
#define INT16_QUERYSHIFT 0x02
#define INT16_SETDELAYS 0x03
#define INT16_WRITECHAR 0x05
#define INT16_READEXTCHAR 0x10
#define INT16_PEEKEXTCHAR 0x11
#define INT16_QUERYEXTSHIFT 0x12
#define INT16_READ122CHAR 0x20
#define INT16_PEEK122CHAR 0x21
#define INT16_QUERY122SHIFT 0x22
/*** Diskette Parameter Table (pointed by vector BIOSINT_DISKPARMS (1Eh))
*/
typedef struct fdparmtable_s {
BYTE fdp_bSpecify1; /* step-rate, head-unload */
BYTE fdp_bSpecify2; /* head-load, DMA mode */
BYTE fdp_bMotorOff; /* motor-off delay */
BYTE fdp_bSectorSize; /* bytes/sec (0=128,1=256,2=512,3=1024) */
BYTE fdp_nLastSector; /* (or think of it as # sectors/track) */
BYTE fdp_lenGapRW; /* */
BYTE fdp_lenData; /* */
BYTE fdp_lenGapFormat; /* */
BYTE fdp_bFormatData; /* format initialization byte */
BYTE fdp_bSettle; /* head settle time */
BYTE fdp_bMotorOn; /* motor start-up time */
} FDPARMTABLE;
typedef FDPARMTABLE *PFDPARMTABLE; /* pointer to diskette parameter table */
/*** Fixed Disk Parameter Table
*/
typedef struct hdparmtable_s {
WORD hdp_wMaxCylinders; /* maximum number of cylinders */
BYTE hdp_bMaxHeads; /* maximum number of heads */
WORD hdp_wReserve1; /* reserved (not used) */
WORD hdp_wWritePrecompCyl; /* starting write precompensation cyl. */
BYTE hdp_bMaxECCDataBurstLen; /* maximum ECC data burst length */
BYTE hdp_bControl; /* control byte */
BYTE hdp_abReserve2[3]; /* reserved (not used) */
WORD hdp_wLandingZone; /* landing zone for head parking */
BYTE hdp_bSectorsPerTrack; /* number of sectors per track */
BYTE hdp_bReserve3; /* reserved for future use */
} HDPARMTABLE;
typedef HDPARMTABLE *PHDPARMTABLE; /* pointer to hard disk parameter table */
/*** Hard disk parameter - control byte bit mask
*/
#define HDPCTRL_DISABLERETRY 0xc0 /* disable retries */
#define HDPCTRL_EXCEED8HEADS 0x08 /* more than 8 heads */
/*** Model byte equates (located at F000:FFFE in actual ROM)
*/
#define ROMMODEL_PC1 0x0FF /* PC-1, Expansion, Old PC2 (PC) */
#define ROMMODEL_PC2 0x0FE /* PC-2, Newer (XT) */
#define ROMMODEL_JR 0x0FD /* HALO (JR) */
#define ROMMODEL_AT 0x0FC /* Salmon (PC-3) (AT) */
/*** ROM format
*/
#define ROMHDR_SIGNATURE 0xAA55
#define ROMHDR_INCR 512 /* this would be 2K, but we're paranoid */
#define BLOCKSIZE 512
#define BLOCKSPERPAGE (PAGESIZE / BLOCKSIZE)
/* c-begin */
#define PAGESFROMBLOCKS(nbl) ((nbl+BLOCKSPERPAGE-1) / BLOCKSPERPAGE)
#define BLOCKSFROMBYTES(nb) ((nb+BLOCKSIZE-1) / BLOCKSIZE)
/* c-end */
typedef struct romhdr_s {
WORD romhdr_wSignature; /* should be ROMHDR_SIGNATURE */
BYTE romhdr_bnBlocks; /* # of ROM blocks */
BYTE romhdr_abFiller[ROMHDR_INCR-3];
} ROMHDR;
typedef ROMHDR *PROMHDR;
/*** ROM BIOS Data Area
*/
typedef struct romdata_s {
VPVOID rb_avpIVT[IVT_LEN/4]; /* interrupt vector table */
/*** Start of ROM BIOS Data Areas (0400h)
*/
WORD rb_awCOM[4]; /* RS232_BASE (addresses of serial cards) */
WORD rb_awLPT[4]; /* PRINTER_BASE (addresses of printer cards) */
WORD rb_fsEquip; /* EQUIP_FLAG (installed hardware) */
#define BIOSEQUIP_FLOPPY 0x00001 /* machine has a floppy */
#define BIOSEQUIP_X87 0x00002 /* X87=1 if coprocessor installed */
#define BIOSEQUIP_VIDEOMASK 0x00030 /* video configuration bits */
#define BIOSEQUIP_COLOR40VIDEO 0x00010 /* */
#define BIOSEQUIP_COLOR80VIDEO 0x00020 /* */
#define BIOSEQUIP_MONOVIDEO 0x00030 /* */
#define BIOSEQUIP_FLOPPYMASK 0x000C0 /* # floppies-1 (if IPLDISK=1) */
#define BIOSEQUIP_COMMASK 0x00E00 /* # COM ports */
#define BIOSEQUIP_PRINTERMASK 0x0C000 /* # LPT ports */
BBOOL rb_bfMfgTest; /* MFG_TST (initialization flag) */
WORD rb_wMemSize; /* MEMORY_SIZE (memory size in Kbytes) */
BBOOL rb_bfMfgError[2]; /* MFG_ERR_FLAG (scratchpad for manufacturing) */
/*** Start of keyboard data area (0417h)
*/
BYTE rb_fbKFlag; /* KB_FLAG (keyboard shift states) */
#define BIOSKFLAG_RIGHTSHIFT 0x01
#define BIOSKFLAG_LEFTSHIFT 0x02
#define BIOSKFLAG_SHIFTMASK 0x03
#define BIOSKFLAG_CTRL 0x04
#define BIOSKFLAG_ALT 0x08
#define BIOSKFLAG_SCROLLLOCK 0x10
#define BIOSKFLAG_NUMLOCK 0x20
#define BIOSKFLAG_CAPSLOCK 0x40
#define BIOSKFLAG_INSERT 0x80
BYTE rb_fbKFlag1; /* KB_FLAG_1 (second byte of keyboard status) */
#define BIOSKFLAG1_LEFTCTRL 0x01 /* left CTRL down */
#define BIOSKFLAG1_LEFTALT 0x02 /* left ALT down */
#define BIOSKFLAG1_SYSSHIFT 0x04 /* SysReq pressed and held */
#define BIOSKFLAG1_HOLDSTATE 0x08 /* Ctrl-NumLock has been pressed */
#define BIOSKFLAG1_SCROLLDOWN 0x10
#define BIOSKFLAG1_NUMDOWN 0x20
#define BIOSKFLAG1_CAPSDOWN 0x40
#define BIOSKFLAG1_INSDOWN 0x80
BYTE rb_bKAlt; /* ALT_INPUT (storage for Alt-keypad entry) */
WORD rb_npKHead; /* BUFFER_HEAD (advanced at task-time) */
WORD rb_npKTail; /* BUFFER_TAIL (advanced at interrupt-time) */
WORD rb_abKBuf[16]; /* KB_BUFFER */
/*** Start of floppy data area (043Eh)
*/
BYTE rb_fbFSeekStatus; /* SEEK_STATUS */
#define BIOSSEEK_DRV0NORECAL 0x01
#define BIOSSEEK_DRV1NORECAL 0x02
#define BIOSSEEK_DRV2NORECAL 0x04
#define BIOSSEEK_DRV3NORECAL 0x08
#define BIOSSEEK_DRVINTERRUPT 0x80
BYTE rb_fbFMotorStatus; /* MOTOR_STATUS */
#define BIOSMOTOR_DRV0RUNNING 0x01
#define BIOSMOTOR_DRV1RUNNING 0x02
#define BIOSMOTOR_DRV2RUNNING 0x04
#define BIOSMOTOR_DRV3RUNNING 0x08
#define BIOSMOTOR_DRVSELECT 0x30
#define BIOSMOTOR_WRTOPERATION 0x80
BYTE rb_bFMotorCount; /* MOTOR_COUNT */
BYTE rb_bFStatus; /* DISKETTE_STATUS */
BYTE rb_abFCtlStatus[7]; /* NEC_STATUS (also CMD_BLOCK and HD_ERROR) */
/*** Start of video data area (0449h)
*/
BYTE rb_bVMode; /* CRT_MODE */
#define BIOSVMODE_BW40 0x00
#define BIOSVMODE_CO40 0x01
#define BIOSVMODE_BW80 0x02
#define BIOSVMODE_CO80 0x03
#define BIOSVMODE_CO320X200X4 0x04
#define BIOSVMODE_BW320X200X4 0x05
#define BIOSVMODE_CO640X200X2 0x06
#define BIOSVMODE_MONO80 0x07
#define BIOSVMODE_PCJR1 0x08
#define BIOSVMODE_PCJR2 0x09
#define BIOSVMODE_PCJR3 0x0A
#define BIOSVMODE_COLRFONT 0x0B
#define BIOSVMODE_MONOFONT 0x0C
#define BIOSVMODE_CO320X200X16 0x0D
#define BIOSVMODE_CO640X200X16 0x0E
#define BIOSVMODE_MONO640X350X4 0x0F
#define BIOSVMODE_CO640X350X16 0x10
#define BIOSVMODE_CO640X480X2 0x11
#define BIOSVMODE_CO640X480X16 0x12
#define BIOSVMODE_CO320X200X256 0x13
WORD rb_nVCols; /* CRT_COLS */
WORD rb_wVLen; /* CRT_LEN */
WORD rb_wVStart; /* CRT_START */
WORD rb_awVCursorPos[8]; /* CURSOR_POSN */
WORD rb_wVCursorMode; /* CURSOR_MODE */
BYTE rb_bVPage; /* ACTIVE_PAGE */
WORD rb_wVPort; /* ADDR_6845 */
BYTE rb_bVModeByte; /* CRT_MODE_SET */
BYTE rb_bVPalByte; /* CRT_PALETTE */
/*** Start of POST data area (0467h)
*/
VPVOID rb_vpRomInit; /* IO_ROM_INIT and IO_ROM_SEG */
BBOOL rb_fInterrupt; /* INTR_FLAG */
/*** Start of timer data area (046Ch)
*/
ULONG rb_ulTickCount; /* TIMER_LOW and TIMER_HIGH */
BYTE rb_bTickOverflow; /* TIMER_OFL */
/*** Start of system data area (0471h)
*/
BBOOL rb_fBreak; /* BIOS_BREAK */
#define BIOSBREAK_SET 0x80
SBOOL rb_fReset; /* RESET_FLAG */
#define BIOSRESET_WARMBOOT 0x1234
/*** Start of hard disk data area (0474h)
*/
BYTE rb_bDStatus; /* DISK_STATUS1 (fixed disk status byte) */
BYTE rb_nDTotal; /* HF_NUM (count of fixed disk drives) */
BYTE rb_bDControl; /* CONTROL_BYTE (control byte drive options) */
BYTE rb_bDPortOffset; /* PORT_OFF (port offset) */
/*** Start of COM and LPT time-out data area (0478h)
*/
BYTE rb_abLPTtimeout[4]; /* PRINT_TIM_OUT */
BYTE rb_abCOMtimeout[4]; /* RS232_TIM_OUT */
/*** Start of additional keyboard data area (0480h)
*/
WORD rb_npKBufStart; /* BUFFER_START */
WORD rb_npKBufEnd; /* BUFFER_END */
/*** Start of EGA/VGA data area (0484h)
*/
BYTE rb_nVRows; /* ROWS (# rows-1) */
WORD rb_nVCharHeight; /* POINTS (height of char in pixels) */
BYTE rb_bVInfo; /* INFO */
#define BIOSVINFO_NOEMULATE 0x01 /* (controls cursor emulation) */
#define BIOSVINFO_EGAMONO 0x02 /* */
#define BIOSVINFO_WAITRETRC 0x04 /* */
#define BIOSVINFO_EGAINACTIVE 0x08 /* */
#define BIOSVINFO_MEMMASK 0x60 /* (00=64k, 01=128k, 10=192k, 11=256k) */
#define BIOSVINFO_DONTCLEAR 0x80 /* (don't clear screen on resets) */
BYTE rb_bVSwitches; /* INFO_3 */
#define BIOSVSW_SW1OFF 0x01
#define BIOSVSW_SW2OFF 0x02
#define BIOSVSW_SW3OFF 0x04
#define BIOSVSW_SW4OFF 0x08
#define BIOSVSW_FEATUREBITS 0xF0
BYTE rb_bVFlags; /* Flags (for VGA and MCGA) */
#define BIOSVFLAGS_VGAACTIVE 0x01
#define BIOSVFLAGS_GRAYSCALES 0x02
#define BIOSVFLAGS_VGAMONO 0x04
#define BIOSVFLAGS_NODEFPALETTE 0x08
#define BIOSVFLAGS_DSPSWITCHING 0x40
#define BIOSVFLAGS_350LINES 0x00
#define BIOSVFLAGS_400LINES 0x10
#define BIOSVFLAGS_200LINES 0x80
#define BIOSVFLAGS_RESRVDLINES 0x90
/*** Reserved area (048Ah)
*/
BYTE rb_bReserved1[1]; /* reserved */
/*** Start of additional diskette data area (048Bh)
*/
BYTE rb_bFLastRate; /* LASTRATE */
/*** Start of additional hard disk data area (048Ch)
*/
BYTE rb_bDStatusReg; /* HF_STATUS */
BYTE rb_bDErrorReg; /* HF_ERROR */
BBOOL rb_fDInterrupt; /* HF_INT_FLAG */
BBOOL rb_fDCombo; /* HF_CNTRL (combo hard disk/diskette card) */
/*** Start of additional diskette data area (0490h)
*/
BYTE rb_bF0State; /* DSK_STATE (drive 0 media state) */
BYTE rb_bF1State; /* (drive 1 media state) */
BYTE rb_bF0StartState; /* (drive 0 operation start state) */
BYTE rb_bF1StartState; /* (drive 1 operation start state) */
BYTE rb_bF0Cyl; /* DSK_TRK (drive 0 current cylinder) */
BYTE rb_bF1Cyl; /* (drive 1 current cylinder) */
/*** Start of additional keyboard data area (0496h)
*/
BYTE rb_fbKFlag3; /* KB_FLAG_3 */
#define BIOSKFLAG3_E1PREFIX 0x01 /* supported */
#define BIOSKFLAG3_SECPREFIX 0x02 /* supported */
#define BIOSKFLAG3_RIGHTCTRL 0x04 /* right CTRL down */
#define BIOSKFLAG3_RIGHTALT 0x08 /* right ALT down */
#define BIOSKFLAG3_KBX 0x10 /* supported */
#define BIOSKFLAG3_SETNUMLOCK 0x20 /* supported */
#define BIOSKFLAG3_LASTID 0x40 /* supported */
#define BIOSKFLAG3_READINGID 0x80 /* supported (we never SET it though!) */
BYTE rb_fbKFlag2; /* KB_FLAG_2 */
#define BIOSKFLAG2_LEDS 0x07 /* supported */
#define BIOSKFLAG2_ACK 0x10 /* supported */
#define BIOSKFLAG2_RESEND 0x20 /* supported */
#define BIOSKFLAG2_LEDUPDATE 0x40 /* always clear */
#define BIOSKFLAG2_XMITERROR 0x80 /* always clear */
/*** Start of real-time CMOS clock data area (0498h)
*/
VPVOID rb_vpWaitFlag; /* USER_FLAG and USER_FLAG_SEG */
ULONG rb_ulWaitFlag; /* RTC_LOW and RTC_HIGH */
BBOOL rb_fWaitActive; /* RTC_WAIT_FLAG */
BYTE rb_bReserved2[7]; /* this should "ORG" us to 04A8h */
/*** Start of additional EGA/VGA data area (04A8h)
*/
VPVOID rb_vpVideoPtrTable;
/*** Format of VideoPtrTable:
*
* VPVOID[0] Parameter Table Pointer
* Initialized to BIOS Video Parameter Table.
* This value MUST exist. For a VGA, the table is:
*
* BYTE Value for CRT_COLS
* BYTE Value for ROWS
* BYTE Value for POINTS
* WORD Value for CRT_LEN
* BYTE*4 Values for SEQ registers 1-4
* BYTE Value for Miscellaneous Output register
* BYTE*25 Values for CRT registers 0-18h
* BYTE*20 Values for ATC registers 0-13h
* BYTE*9 Values for GDC registers 0-8
*
* VPVOID[1] Parameter Save Area Pointer
* Initialized to 0000:0000, this value is optional.
* When non-zero, this pointer will be used as pointer
* to a RAM area where certain dynamic values are to
* be saved. When in EGA operation this RAM area will
* hold the 16 EGA palette register values plus
* the overscan value in bytes 00h-10h respectively.
* At least 256 bytes must be allocated for this area.
*
* VPVOID[2] Alpha Character Set Override Pointer
* Initialized to 0000:0000, this value is optional.
* When non-zero, this pointer is used as a pointer
* to a tables described as follows:
*
* BYTE Bytes/character
*
* BYTE Block to load, should be zero for normal
* operation
*
* WORD Count to store, should be 256 for normal
* operation
*
* WORD Character offset, should be zero for normal
* operation
*
* VPVOID Pointer to a font table
*
* BYTE Displayable rows
* if 'FF' the maximum calculated value will be
* used, else this value will be used
*
* BYTE Consecutive bytes of mode values for which
* this font description is to be used.
* The end of this stream is indicated by a
* byte code of 'FF'
*
* VPVOID[3] Graphics Character Set Override Pointer
* Initialized to 0000:0000, this value is optional.
* When non-zero, this pointer is used as a pointer
* to a tables described as follows:
*
* BYTE Displayable rows
*
* WORD Bytes per character
*
* VPVOID Pointer to a font table
*
* BYTE Consecutive bytes of mode values for which
* this font description is to be used.
* The end of this stream is indicated by a
* byte code of 'FF'
*
* VPVOID[4] Address of Secondary Video Pointer Table (VGA ONLY):
*
* WORD Length of this table, in bytes
* VPVOID Pointer to Display Combination Code Table
* VPVOID Pointer to second Alpha Character Set Override
* VPVOID Pointer to User Palette Profile Table
* VPVOID Reserved
* VPVOID Reserved
* VPVOID Reserved
*
* VPVOID[5] Reserved and set to 0000:0000.
*
* VPVOID[6] Reserved and set to 0000:0000.
*/
BYTE rb_bReserved3[0x54]; /* this should "ORG" us to 0500h */
/*** Extra data area (0500h)
*/
BYTE rb_bPrtScrStatus; /* STATUS_BYTE */
} ROMDATA;
typedef ROMDATA *PROMDATA;
/* c-begin */
typedef PROMDATA PVDMBASE;
#define VDMBase (*(PVDMBASE)0)
/* c-end */
/* masm-begin */
/* VDMBase equ <ds:[0]> */
/* .errnz (size romdata_s NE 0501h) */
/* masm-end */
