fat12.asm

; FAT format helps us read from the disk

JMP SHORT boot
NOP

; Defining the headers

bdb_oem:                    db  'MSWIN4.1'
bdb_bytes_per_sector:       dw 512
bdb_sectors_per_cluster:    db 1
bdb_reserved_sectors:       dw 1
bdb_fat_count:              db 2
bdb_dir_entries_count:      dw 0E0h
bdb_total_sectors:          dw 2880
bdb_media_descriptor_type:  db 0F0h
bdb_sectors_per_fat:        dw 9
bdb_sectors_per_track:      dw 18
bdb_heads:                  dw 2
bdb_hidden_sectors:         dd 0
bdb_large_sector_count:     dd 0

ebr_drive_number:           db 0
                            db 0
ebr_signature:              db 29h
ebr_volume_id:              db 12h, 34h, 56h, 78h
ebr_volume_label:           db 'virtual    ' ; had to pad to 11 characters
ebr_system_id:              db 'FAT12   ' ; had to pad to 8 characters