cesky: 
,
English: 
BIOSDISK
Physical disk BIOS
Physical disk BIOS is:
floppy disk FD1: .. FD2: (BIOS disk number = 0..1),
hard disk HD1: .. HD4: (BIOS disk number = 80h .. 83h),
RAM memory: (continuous 640 KB memory block, BIOS pseudo disk number = 0A0h),
RAM disk RD1: (formated FAT12, address from 0001:0000h, BIOS pseudo disk number BIOS = 0C0h).
Floppy disks support only typical formats, e.g. only diskette with a capacity of 1.44 MB MB is supported in 1.44 MB drive. Hard drives can be controlled via the LBA interface. It is treated well to boot disk, therefore system partition can reside anywhere on the disk.
BDiskGetNum - get number of BIOS disks
OUTPUT:
AL = number of disks
CL = number of floppy disks
CH = number of hard disks
BDiskGetDesc - get BIOS disk descriptor
INPUT:
AL = disk number (0...)
OUTPUT:
BX = pointer to BDD descriptor (or NULL on CY error)
CY = error, invalid disk number (returns BX = NULL)
BDiskGetDescBIOS - get BIOS disk descriptor by BIOS disk number
INPUT:
AL = BIOS disk number (0=fd1, ... 80h=hd1, ... 0C0h=rd1, ...)
OUTPUT:
BX = pointer to BDD descriptor (or NULL on CY error)
CY = error, invalid disk number (returns BX = NULL)
BDiskGetType - get BIOS disk type TEXT
INPUT:
BX = pointer to BDD descriptor
OUTPUT:
SI = pointer to CTEXT disk type name
BDiskGetInfo - get BIOS disk info TEXT
INPUT:
AL = disk number (0...)
OUTPUT:
BX = pointer to TEXT structure (NULL on memory error)
CY = disk or memory error (BX = NULL)
NOTES: Returned text should be destroyed using TextFree.
BDiskGetAllInfo - get BIOS all disks info TEXT
OUTPUT:
BX = pointer to TEXT structure (NULL on memory error)
CY = memory error (BX = NULL)
NOTES: Returned text should be destroyed using TextFree.
LBAToCHS - translate absolute sector to CHS
INPUT:
DX:AX = absolute sector (0...)
BX = pointer to BDD descriptor
OUTPUT:
CL = bit 0..5: sector number (1..63), bit 6..7: cylinder number
HIGH (bits 8..9)
CH = cylinder number LOW (bits 0..7)
DH = head number (0..255); or bit 0..5 head number (0..63), bit
6,7: cylinder bits 10..11
DESTROYS: DL
BDiskRead - read sectors
INPUT:
DX:AX = absolute sector (0..)
BX = pointer to BDD descriptor
CL = number of sectors (1..127)
DI = data buffer
OUTPUT:
CY = operation error
DX:AX = new sector
DI = new data buffer
BDiskWrite -
write sectors (without verify)
BDiskWriteV - write sectors with verify
INPUT:
DX:AX = absolute sector (0..)
BX = pointer to BDD descriptor
CL = number of sectors (1..127)
DI = data buffer
OUTPUT:
CY = operation error
DX:AX = new sector
DI = new data buffer
BDiskVerify - verify sectors
INPUT:
DX:AX = absolute sector (0..)
BX = pointer to BDD descriptor
CL = number of sectors (1..127)
OUTPUT:
CY = operation error
DX:AX = new sector
BDiskReadSect - read cached sector (into sector buffer)
INPUT:
DX:AX = absolute sector (0..)
BX = pointer to BDD descriptor
OUTPUT:
SI = sector buffer SectBuf
CY = operation error
BDiskWriteSect - write cached sector (from sector buffer)
OUTPUT:
CY = operation error
NOTES: Valid parameters must be set in OldSectBDD and OldSect by function BDiskReadSect.
HDDCheck - check hard disk
INPUT:
BL = hard disk index (0..)
OUTPUT:
CY = invalid hard disk
FDDCheck - check floppy disk
INPUT:
BL = floppy disk index (0..)
OUTPUT:
CY = invalid floppy disk
BDD - BIOS disk descriptor (physical disk)
BDD_Disk: (byte) disk BIOS number
(0=fd0,...)
BDD_Flags: (byte) flags and media type (see below), bit 0..3:
media type
BDD_SectTrack: (word) S sectors per track (1..63)
BDD_Heads: (word) H number of heads (1..256)
BDD_Cylinders: (word) C number of cylinders (1..1024)
BDD_SectCyl: (word) sectors per cylinder (1..16128)
BDD_DevName: (word) CTEXT device name
BDD_SectNum: (dword) total number of sectors
BIOS disk flags and media type:
BDDF_Floppy288: (=0) floppy disk 2.88 MB
(3.5")
BDDF_Floppy360: (=1) floppy disk 360 KB (5.25")
BDDF_Floppy12: (=2) floppy disk 1.2 MB (5.25")
BDDF_Floppy720: (=3) floppy disk 720 KB (3.5")
BDDF_Floppy144: (=4) floppy disk 1.44 MB (3.5")
BDDF_FloppyLast: (=BDDF_Floppy144) last floppy disk
BDDF_HardDisk: (=5) hard disk
BDDF_MEMDisk: (=6) memory disk (RAW memory)
BDDF_RAMDisk: (=7) RAM disk (FAT file system)
BDDF_TypeMask: (=0Fh) media type mask
BDDF_UseLBA: (=B6) bit flag, use LBA extension (CHS invalid)
BDDF_Removable: (=B7) bit flag, removable media
