小巧的menuetOS

我从网上发现了一个叫MenuetOS的小操作系统，下载下来后只有800多K；据说这个操作系统是作者利用业余时间写的。该操作系统的官方网站上还有关于如何在MenuetOS上编程的示例，但是只有汇编语言的，下面就是其中的一个：

  1 ;
  2 ;   64 bit Menuet example
  3 ;
  4 ;   Compile with FASM 1.60 or above
  5 ;
  6
  7 use64
  8
  9     org   0x0
10
11     db    'MENUET64'              ; Header identifier
12     dq    0x01                    ; Version
13     dq    START                   ; Start of code
14     dq    image_end               ; Size of image
15     dq    0x100000                ; Memory for app
16     dq    0xffff0                 ; Esp
17     dq    0x00                    ; Prm
18     dq    0x00                    ; Icon
19
20
21 START:
22
23     call  draw_window       ; At first, draw the window
24
25 still:
26
27     mov   rax , 0xA         ; Wait here for event
28     int   0x60
29
30     test  rax , 0x1         ; Window redraw
31     jnz   window_event
32     test  rax , 0x2         ; Keyboard press
33     jnz   key_event
34     test  rax , 0x4         ; Button press
35     jnz   button_event
36
37     jmp   still
38
39 window_event:
40
41     call  draw_window
42     jmp   still
43
44 key_event:
45
46     mov   rax , 0x2        ; Read the key and ignore
47     int   0x60
48
49     jmp   still
50
51 button_event:
52
53     mov   rax , 0x11
54     int   0x60
55
56     ; rax = status
57     ; rbx = button id
58
59     cmp   rbx , 0x10000001
60     jne   no_application_terminate_button
61     mov   rax , 0x200
62     int   0x60
63   no_application_terminate_button:
64
65     cmp   rbx , 0x106
66     jne   no_application_terminate_menu
67     mov   rax , 0x200
68     int   0x60
69   no_application_terminate_menu:
70
71     jmp   still
72
73
74 draw_window:
75
76     mov   rax , 0xC                          ; Beginning of window draw
77     mov   rbx , 0x1
78     int   0x60
79
80     mov   rax , 0x0                          ; Draw window
81     mov   rbx , 0x0000010000000100           ; x start & size
82     mov   rcx , 0x00000080000000C0           ; y start & size
83     mov   rdx , 0x0000000000FFFFFF           ; type    & border color
84     mov   r8  , 0x0000000000000001           ; draw flags
85     mov   r9  , window_label                 ; 0 or label - asciiz
86     mov   r10 , menu_struct                  ; 0 or pointer to menu struct
87     int   0x60
88
89     mov   rax , 0x4                          ; Display text
90     mov   rbx , text
91     mov   rcx , 0x20
92     mov   rdx , 0x40
93     mov   rsi , 0x0
94     mov   r9  , 0x1
95     mov   r8  , 0x3
96
97   newline:
98
99     int   0x60
100
101     add   rbx , 0x1F
102     add   rdx , 0x10
103     dec   r8
104     jnz   newline
105
106     mov   rax , 0xC                          ; End of window draw
107     mov   rbx , 0x2
108     int   0x60
109
110     ret
111
112
113 ; Data area
114
115 window_label:
116
117     db    'EXAMPLE',0     ; Window label
118
119 text:
120
121     db    'HELLO WORLD FROM 64 BIT MENUET',0
122     db    'Second line                   ',0
123     db    'Third line                    ',0
124
125 menu_struct:               ; Menu Struct
126
127     dq   0                 ; Version
128
129     dq   0x100             ; Start value of ID to return ( ID + Line )
130
131                            ; Returned when menu closes and
132                            ; user made no selections.
133
134     db   0,'FILE',0        ; ID = 0x100 + 1
135     db   1,'New',0         ; ID = 0x100 + 2
136     db   1,'Open..',0      ; ID = 0x100 + 3
137     db   1,'Save..',0      ; ID = 0x100 + 4
138     db   1,'-',0           ; ID = 0x100 + 5
139     db   1,'Quit',0        ; ID = 0x100 + 6
140
141     db   0,'HELP',0        ; ID = 0x100 + 7
142     db   1,'Contents..',0  ; ID = 0x100 + 8
143     db   1,'About..',0     ; ID = 0x100 + 9
144
145     db   255               ; End of Menu Struct
146
147 image_end:
148
149

我不懂汇编，但是我感觉汇编语言的语句似乎都比较短。
下面是一些官方网站上提供的截图：

谁知道这会不会是下一个Windows呢？