汇编中结构体的声明与定义

ReadCommand struc ; data struct to describe a read command
PackSize db 0
Reserved db 0
BlockCount dw 0
BufferAddr dd 0
BlockNumLow dd 0
BlockNumHigh dd 0
ReadCommand ends

DiskAddressFD ReadCommand<10h,0,20h,10000000h,138e4h,0> ; read 20h sectors from sector 0x138e4 into address 1000:0000