操作系统学习笔记(23)--系统内存获取

; Use int 15h to find out size of extended memory in KB.
; Extended memory is the memory above 1MB.  So by
; adding 1MB to this amount, we get the total amount
; of system memory.  We can only detect 64MB this way,
; but that's OK for now.
mov	ah, 0x88
int	0x15
add	ax, 1024	; 1024 KB == 1 MB
mov	[mem_size_kbytes], ax