操作系统设计与实现源码

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				%!PS-Adobe-1.0				%%Creator: devps (Pipeline Associates, Inc.)				%%CreationDate: Fri Sep 13 14:26:44 1996				%%Pages: (atend)				%%DocumentFonts: (atend)								/devps 180 dict def devps begin				/res 10.000000 def				/y_offset 843 def				/X{exch}bind def				/mm {transform round X round X itransform} bind def				/r{rmoveto}bind def				/m{moveto}bind def				/l{lineto}bind def				/rl{rlineto}bind def				/st{stroke}bind def				/gs{gsave}bind def				/gr{grestore}bind def				/cp{currentpoint}bind def				/np{newpath}bind def				/ct{curveto}bind def				systemdict /setpacking known				 { /savepacking currentpacking def true setpacking } if				/m0{0 0 moveto}bind def				/xc{//res div}bind def				/yc{//res neg div //y_offset add}bind def				/lc{yc X xc X l st}bind def				/mc{yc X xc X m}bind def				/el{gs /a X def a div 1 X scale cp np a xc 2 div 0 360 arc st gr}bind def				/ar{cp 7 2 roll np xc 5 1 roll atan 3 1 roll atan X arc st}bind def				/sp{yc X xc X 6 2 roll yc X xc X 6 2 roll yc X xc X 6 2 roll ct}bind def				/V{//res neg div //y_offset add				currentpoint pop X				m}bind def				/H{//res div				0 transform X round X itransform pop				currentpoint X pop				moveto}bind def				/h{//res div 0 r}bind def				/v{//res neg div 0 X r}bind def				/S{X H show}bind def				/A{H //res div 1 index stringwidth pop sub 1 index length div 0 3 2 roll ashow}bind def				/psize 10 def				/height 0 def				/cheight { height 0 ne { height } { psize } ifelse } bind def				/slant 0 def				/FF{findfont X dup 30 div 0 mm pop setlinewidth /psize X def				    [psize 0 cheight slant sin slant cos div mul cheight 0 0]				    makefont setfont}bind def				/shade{gs				 /dy X def				 /dx X def				 np m				 0 /dy rl				 /dx 0 rl				 0 /dy neg rl				 /dx neg 0 rl				 closepath				 .9 setgray				 fill				gr}bind def				1 setlinecap								/resolution res 72 mul def												/startFig {					/SavedState save def					userdict maxlength dict begin					currentpoint transform									DocumentInitState 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