FAT 12实施 [英] FAT 12 Implementation

问题描述

我一直在 http://www.brokenthorn.com 上关注操作系统开发教程.现在，我正在尝试使用以下代码设置BIOS参数块:

I have been following the Operating System development tutorial on http://www.brokenthorn.com. Right now I'm trying to setup the BIOS parameter block with this code:

jmp loader
bpbName db "NubOS",0,0,0
bpbBytesPerSector:      DW 512
bpbSectorsPerCluster:   DB 1
bpbReservedSectors:     DW 1
bpbNumberOfFATs:        DB 2
bpbRootEntries:         DW 224
bpbTotalSectors:        DW 2880
bpbMedia:               DB 0xF0
bpbSectorsPerFAT:       DW 9
bpbSectorsPerTrack:     DW 18
bpbHeadsPerCylinder:    DW 2
bpbHiddenSectors:       DD 0
bpbTotalSectorsBig:     DD 0
bsDriveNumber:          DB 0
bsUnused:               DB 0
bsExtBootSignature:     DB 0x29
bsSerialNumber:         DD 0xa0a1a2a3
bsVolumeLabel:          DB "MOS FLOPPY "
bsFileSystem:           DB "FAT12   "

但是，当我尝试使用 ImDisk驱动程序打开磁盘时虚拟软盘，它表示驱动器需要格式化.我使用的代码正确吗?

However, when I try to open the disk using the ImDisk driver for virtual floppies, it says that the drive needs to be formatted. Is the code I'm using correct?

推荐答案

尝试短跳转:该扇区以jmp short loader开头，然后是nop，然后通过bpbName c3>，然后是loader:和所有代码，然后是512字节扇区的最后2个字节为0x55和0xAA.这两个必须分别在偏移量510和511处.

Try a short jump: the sector begins with jmp short loader, followed by nop, then go bpbName through bsFileSystem, then loader: and all your code and then the last 2 bytes of the 512-byte sector being 0x55 and 0xAA. These two must be at offsets 510 and 511 respectively.

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