ACT apricot - Page 295

DISKS
The Label Sector
The Apricot disk Label sector is the first 512 bytes on the
disk (1 sector). Only the first 128 bytes are relevant for the
boot
ROM locating where the operating system is on the
disk, where to load it in RAM, and where to execute it from
when loaded. These 128 bytes are divided as follows:
MNEMONIC TYPE SPECIMEN VALUE
LBLforllLvers WORD
0,0,0,0
BYTE
1
BYTE
°
LBLcopy_prot
BYTE
°
LBLbooLdisk
BYTE *
LBLmulti_region BYTE
o
LBLwinchester BYTE
o
LBLSec_size WORD
512
LBLSec_track WORD
9
LBLtracks_side WORD
70,0
LBLsides BYTE 1
LBLinterleave BYTE
LBLskew
WORD
5
LBLbooLlocn
WORD *
29,0
DESCRIPTION
Version of FORMAT
that created disk
O=invalid
l=MSDOS 2.0
2=p-system
3=CP/M-86
4=Concurrent CP/M
5=BOS
6=UNIX
Software Write
Protect
l=disk is protected
O=disk is not
Not used
Must be 1 if a valid
boot disk (0 on data
only disks)
Not Multi-regioned
Not a Winchester
Disk
Sector Size
Sectors per track
Tracks per side
Number of sides
Interleave factor
Skew factor
Sector of boot image