📄 fd.4

📁 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 13:08:00 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 defsystemdict /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 addcurrentpoint pop Xm}bind def/H{//res div0 transform X round X itransform popcurrentpoint X popmoveto}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 fillgr}bind def1 setlinecap/resolution res 72 mul def/startFig {	/SavedState save def	userdict maxlength dict begin	currentpoint transform	DocumentInitState setmiterlimit setgray setdash setlinejoin setlinecap		setlinewidth setmatrix	itransform moveto	/ury exch def	/urx exch def	/lly exch def	/llx exch def	/y exch 72 mul resolution div def	/x exch 72 mul resolution div def		currentpoint /cy exch def /cx exch def	/sx x urx llx sub div def	/sy y ury lly sub div def	sx sy scale	cx sx div llx sub	cy sy div ury sub translate		/DefFigCTM matrix currentmatrix def	/initmatrix {		DefFigCTM setmatrix	} def	/defaultmatrix {		DefFigCTM exch copy	} def	/initgraphics {		DocumentInitState setmiterlimit setgray setdash 			setlinejoin setlinecap setlinewidth setmatrix		DefFigCTM setmatrix	} def	/showpage {		initgraphics	} def}bind  def/clipFig {	currentpoint 6 2 roll	newpath 4 copy	4 2 roll moveto	6 -1 roll exch lineto	exch lineto	exch lineto	closepath clip	newpath	moveto}bind  def/doclip { llx lly urx ury clipFig } def/endFig {	end SavedState restore}bind  def/globalstart {	fontnum psize slant height resolution currentpoint 	pagesave restore gsave }bind  def/globalend {	grestore moveto	/resolution exch def /height exch def	/slant exch def /psize exch def /fontnum exch def	F	/pagesave save def}bind  def/fontnum 1 def systemdict /setpacking known { savepacking setpacking} ifend/BP{save mark devps begin m0/DocumentInitState [ matrix currentmatrix currentlinewidth currentlinecapcurrentlinejoin currentdash currentgray currentmiterlimit ] cvx def}bind def/EP{end cleartomark restore showpage}def/Encoding-1 256 array def0 1 255 {Encoding-1 exch /.notdef put} forEncoding-1 8#301 StandardEncoding 8#101 26 getinterval putinterval %A-BEncoding-1 8#341 StandardEncoding 8#141 26 getinterval putinterval %a-bEncoding-1 8#241 StandardEncoding 8#301 16 getinterval putinterval %accentsEncoding-1 8#373 StandardEncoding 8#365 1 getinterval putinterval %dotlessiEncoding-1dup 8#41 /copyright putdup 8#42 /registered putdup 8#43 /trademark putdup 8#44 /logicalnot putdup 8#45 /Eth putdup 8#46 /eth putdup 8#47 /Thorn putdup 8#50 /thorn putdup 8#51 /brokenbar putdup 8#52 /degree putdup 8#53 /divide putdup 8#54 /multiply putdup 8#55 /minus putdup 8#56 /onehalf putdup 8#57 /onequarter putdup 8#60 /threequarters putdup 8#101 /Aacute putdup 8#102 /Acircumflex putdup 8#103 /Adieresis putdup 8#104 /Agrave putdup 8#105 /Aring putdup 8#106 /Atilde putdup 8#107 /Ccedilla putdup 8#110 /Eacute putdup 8#111 /Ecircumflex putdup 8#112 /Edieresis putdup 8#113 /Egrave putdup 8#114 /Iacute putdup 8#115 /Icircumflex putdup 8#116 /Idieresis putdup 8#117 /Igrave putdup 8#120 /Ntilde putdup 8#121 /Oacute putdup 8#122 /Ocircumflex putdup 8#123 /Odieresis putdup 8#124 /Ograve putdup 8#125 /Otilde putdup 8#126 /Scaron putdup 8#127 /Uacute putdup 8#130 /Ucircumflex putdup 8#131 /Udieresis putdup 8#132 /Ugrave putdup 8#133 /Ydieresis putdup 8#134 /Zcaron putdup 8#135 /aacute putdup 8#136 /acircumflex putdup 8#137 /adieresis putdup 8#140 /agrave putdup 8#141 /aring putdup 8#142 /atilde putdup 8#143 /ccedilla putdup 8#144 /eacute putdup 8#145 /ecircumflex putdup 8#146 /edieresis putdup 8#147 /egrave putdup 8#150 /iacute putdup 8#151 /icircumflex putdup 8#152 /idieresis putdup 8#153 /igrave putdup 8#154 /ntilde putdup 8#155 /oacute putdup 8#156 /ocircumflex putdup 8#157 /odieresis putdup 8#160 /ograve putdup 8#161 /otilde putdup 8#162 /scaron putdup 8#163 /uacute putdup 8#164 /ucircumflex putdup 8#165 /udieresis putdup 8#166 /ugrave putdup 8#167 /ydieresis putdup 8#170 /zcaron putpop/Enc-dict 30 dict defEnc-dict /tmpstr1 50 string putEnc-dict /tmpstr2 50 string putEnc-dict /tmpstr3 50 string dup (Encoding-) exch cvs pop put/AEnc-def { % arguments: the original font's name, encoding nrEnc-dict begintmpstr2 cvs /Enc-no exch def % Remember the number in a stringdup /OrigName exch def % remember the namefindfont dup maxlength dict /newdict exch def % get dictionary for new font{ exch dup /FID ne   { exch newdict 3 1 roll put }   { pop pop } % Ignore FID   ifelse} forallnewdict begin/Encoding  tmpstr3 9 Enc-no putinterval tmpstr3 0 9 Enc-no length add getinterval  cvn load  def % Replace encodingcurrentdict /UniqueID known{ /UniqueID UniqueID Enc-no cvi 49999 mul add def } if % Derive New UniqueIDend % newdict/FNlength OrigName tmpstr1 cvs length def % convert name, remember lengthFNlength 1 add Enc-no length add stringdup 0 OrigName tmpstr1 cvs putintervaldup FNlength (-) putintervaldup FNlength 1 add Enc-no putintervaldup 0 tmpstr1 0 FNlength getinterval putinterval % Add old namecvn dup newdict /FontName 3 2 roll put newdict definefontend % Enc-dict} def/Times-Roman 1 AEnc-def pop/R-1{/Times-Roman-1 FF}def/R{/Times-Roman FF}def/B{/Times-Bold FF}def%%EndProlog%%Page: 1 1BP/slant 0 def/height 0 def480 V10 R720(FD)S857(\()S899(4)S957(\))S2696(Eighth)S(Edition)296 2989 A4990(FD)S5127(\()S5169(4)S5227(\))S960 V9 R720(N)S722(NA)S790(AM)S858(ME)S940(E)S1080 V10 R1080(fd)S10 R-11189(-)S10 R(\257oppy)256 1271 A1552(disk)S1248 V9 R720(D)S722(DE)S790(ES)S848(SC)S900(CR)S962(RI)S1024(IP)S1057(PT)S1109(TI)S1167(IO)S1200(ON)S1268(N)S1368 V10 R1080(The)S10 B1272(fd*)S10 R1447(devices)S1784(refer)S2011(to)S2124(the)S(Floppy)284 2282 A2602(disk)S2805(driver)S3082(using)S3335(the)S3494(NEC)S(PD765)279 3732 A(\257oppy)256 4047 A4339(disk)S4542(controller.)S5020(These)S1488 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A2130(24)S(720k)200 2480 A2705(in)S2808(a)S2878(1.2M,)S3142(5.25")S3383(drive)S4152 V1330(7)S1680(PS0)S2130(28)S2480(1.44M,)S2794(3.5")S4320 V1080(Type)S1324(4)S1411(may)S1621(also)S1820(be)S1952(used)S2174(for)S2330(the)S2491(rarely)S2765(seen)S(720k,)225 2982 A3245(5.25")S(\257oppies)318 3499 A3855(\(type)S4100(2)S4188(made)S4444(them)S4683(obsolete)S5056(fast.\))S4440 V1080(Note)S1302(that)S1479(these)S1712("types")S2032(only)S2236(describe)S2597(the)S(\257oppies)318 2745 A3088(from)S3309(a)S3379(software)S3752(point)S3983(of)S4092(view,)S4338(type)S4536(1)S4611(and)S4781(4)S4856(drives)S5127(use)S4560 V1080(the)S1228(same)S1460(parameters.)S4728 V1080(If)S1180(the)S1336(format)S1638(bit)S1777(\(bit)S1950(7\))S2067(is)S2167(set,)S2337(then)S2543(the)S2699(driver)S2973(interprets)S3387(write)S3628(commands)S4096(as)S4213(track)S(formatting)425 4448 A4906(requests.)S4848 V1080(This)S1284(is)S1376(used)S1585(by)S1710(the)S10 B1858(format)S10 R2155(\(1\))S2298(command.)S5016 V1080(If)S1174(the)S1323(type)S1522(bits)S1693(are)S1843(set)S1981(to)S2085(28,)S2236(29,)S2387(30,)S2538(or)S2649(31,)S2801(then)S3001(the)S3151(driver)S3419(uses)S3619(a)S(partition)341 3691 A4059(table)S(found)234 4282 A4543(in)S4648(sector)S4916(0)S4993(to)S5098(par-)S5136 V(tition)212 1080 A1318(the)S(\257oppy.)281 1467 A1799(The)S(partitions)380 1982 A2388(of)S10 B2498(fd0)S10 R2664(may)S2863(be)S(accessed)353 2984 A3363(as)S10 B3473(fd0a)S10 R(through)312 3689 A10 B4026(fd0d)S10 R4222(.)S4297(See)S10 B4468(hd)S10 R4580(\(4\))S4723(for)S4866(a)S4936(descrip-)S5256 V1080(tion)S1261(of)S1370(the)S(partition)341 1518 A1884(table,)S2130(and)S2300(associated)S2739(ioctl)S2943(commands.)S5424 V9 R720(F)S722(FI)S774(IL)S807(LE)S865(ES)S923(S)S5544 V10 R1080(/dev/fd[0)S10 R-11449(-)S10 R1506(3],)S1675(/dev/pc[0)S10 R-12055(-)S10 R2112(3],)S2281(/dev/at[0)S10 R-12639(-)S10 R2696(3],)S2865(/dev/qd[0)S10 R-13250(-)S10 R3307(3],)S3476(/dev/ps[0)S10 R-13850(-)S10 R3907(3],)S4076(/dev/pat[0)S10 R-14484(-)S10 R4541(3],)S4710(/dev/qh[0)S10 R-15095(-)S10 R5152(3],)S5664 V1080(/dev/PS[0)S10 R-11477(-)S10 R1534(3],)S1668(/dev/fd[0)S10 R-12037(-)S10 R2094(3][a)S10 R-12257(-)S10 R2314(d])S5832 V9 R720(S)S722(SE)S774(EE)S832(E)S913(A)S915(AL)S983(LS)S1041(SO)S1093(O)S5952 V10 B1080(format)S10 R1377(\(1\),)S10 B1545(hd)S10 R1657(\(4\),)S10 B1825(part)S10 R2010(\(8\).)S6120 V9 R720(B)S722(BU)S784(UG)S852(GS)S920(S)S6240 V10 R1080(The)S1271(driver)S1546(does)S1764(not)S(know)223 1926 A2183(the)S2340(size)S2531(of)S2649(a)S(360k)200 2728 A2962(diskette)S3309(in)S3421(a)S(360k)200 3500 A3734(5.25")S3984(drive,)S(because)319 4250 A4604(it)S4695(uses)S4903(the)S(720k)200 5061 A6360 V1080(parameters)S1552(for)S1699(it.)S1834(So)S1969(it)S(will)157 2053 A2238(happily)S2567(try)S2707(to)S2813(read)S3015(past)S3205(the)S3356(end)S3529(making)S3858(all)S3987(kinds)S4232(of)S4344(interesting)S4797(noises.)S5126(It's)S6480 V1080(a)S(good)200 1150 A1375(thing)S1606(these)S1838(drives)S2109(are)S2258(practically)S2709(obsolete.)S6648 V1080(The)S(partition)341 1272 A1648(table)S1879(is)S1981(only)S2194(read)S2403(when)S2656(the)S2814(drive)S3056(motor)S3331(is)S3433(off)S3587(and)S3768(only)S3982(for)S4136(an)S4267(auto)S4476(or)S(partition)341 4596 A4973(device.)S6768 V1080(The)S1266(driver)S1536(assumes)S1900(that)S2079(a)S(\257oppy)256 2152 A2436(in)S2542(a)S2615(drive)S2850(with)S3057(a)S(running)312 3130 A3470(motor)S3738(can't)S3968(have)S4186(been)S(replaced)342 4404 A4774(all)S4903(of)S5015(a)S5088(sud-)S6888 V1080(den.)S7056 V9 R720(A)S722(AU)S790(UT)S858(TH)S916(HO)S984(OR)S1052(R)S7176 V10 R1080(Kees)S1307(J.)S1396(Bot)S1566(\(kjb@cs.vu.nl\))S7903 V720(Page)S941(1)S4455(September)S4911(13,)S(1996)200 5061 A8143 VEP%%Trailer%%DocumentFonts: Times-Roman Times-Bold%%Pages: 1
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