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<TITLE>ISAPnP-HOWTO: ISA Bus $B$K$D$$$F(B</TITLE>
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<H2><A NAME="s11">11.</A> <A HREF="ISAPnP-HOWTO.html#toc11">ISA Bus $B$K$D$$$F(B</A></H2>
<P>$BK\J8=q$N$3$N9`0J9_$O5;=QJ8=q$G$9!#(BISAPnP $B$K$D$$$F!"$h$j?<$/!"M}2r$7$?$$?M8~$1$K(B
$B=q$$$F$"$j$^$9$,!"%O!<%I%&%'%"!"(BC $B8@8l!"(Bkernel $B$N4pACCN<1$,$"$k$3$H$r(B
$BA0Ds$K$7$F$$$^$9!#(B</P>
<H2><A NAME="ss11.1">11.1</A> <A HREF="ISAPnP-HOWTO.html#toc11.1">ISA Bus $B$NNr;K$HFCD'(B</A>
</H2>
<P>ISA Bus $B$O(B 1983 $BG/$K(B IBM $B<R$,H/Gd$7$?!"(B8088 CPU$B$rEk:\$7$?(B PC/XT $B$N(B I/O $B%A%c(B
$B%M%k$,$b$H$K$J$C$F$$$^$9!#$3$N(B I/O $B%A%c%M%k$O(B 62 $B%T%s$N%3%M%/%?$r;HMQ$7$F$$$^$9!#(B
1984 $BG/(B $B$K(B IBM$B<R(B $B$O(B 80286 CPU $B$rEk:\$7$?(B PC/AT $B$rH/Gd$7$^$9!#$3$l$K!"H<$C(B
$B$F(B I/O $B%A%c%M%k$b3HD%$5$l!"(BPC/XT $B$N$b$N$K(B 36 $B%T%s$N%3%M%/%?$rDI2C$7$^$7$?!#(B
PC/AT $B$OB??t$N8_495!$,:n@.$5$l!"$=$N8_495!%a!<%+$?$A$K$h$j!"(BPC/AT $B$N(B
I/O $B%A%c%M%k$O(B ISA(Industry Standard Architecture) Bus$B$H8F$P$l$k$h$&$K(B
$B$J$j$^$7$?!#B?$/$N(B PC/AT $B8_495!$K$O(B 6 $BK\$N(B 62 + 36 $B%T%s$N%9%m%C%H$H!"(B
2 $BK\$N(B 62 $B%T%s$N%9%m%C%H$N9g7W!"(B8 $BK\$N(B ISA Bus $B%9%m%C%H$,$"$j$^$7$?!#(B</P>
<P>ISA Bus $B$O(B PC/XT $BM3Mh$N(B 62 $B%T%s$N%9%m%C%H$K$O!"%"%I%l%9%P%9(B 20bit$B!"(B
$B%G!<%?%P%9(B 8bit$B!"3d$j9~$_(B 6 $BK\!"(BDMA 3 $BAH$,$"$j$^$9!#(B
PC/AT $B$GDI2C$5$l$?(B 36 $B%T%s$N%9%m%C%H$K$O!"%"%I%l%9%P%9(B $B>e0L(B 7bit$B!"%G!<%?(B
$B%P%9(B $B>e0L(B 8bit$B!"3d$j9~$_(B 5 $BK\!"(BDMA 4 $BAH$,$"$j$^$9(B(80286 CPU $B$N%"%I%l%9(B
$B$O(B 24bit $B$J$N$G!"(B4bit $B$NDI2C$GB-$j$k$O$:$G$9$,!"2?8N$+(B 7bit $BA}$($F$$$^$9(B)$B!#(B</P>
<P>$B$3$l$i0J30$K!"(BCPU $B$H$N@)8f@~!"%/%m%C%/!"%j%;%C%H!"EE8;$,$"$j$^$9!#(B
Bus $B%/%m%C%/$O(B CPU $B$N%/%m%C%/$K0MB8$7!"(B6MHz,8MHz,10MHz $BEy$,$"$j$^$7$?!#(B
ISA Bus $B$N?.9f@~$O!"(B80286 CPU, DMA $B%3%s%H%m!<%i(B 8237A$B!"3d$j9~$_(B
$B%3%s%H%m!<%i(B 8259A $B$K@\B3$5$l$F$$$F!"$3$l$i$N%G%P%$%98GM-$N%?%$%_%s%0$G(B
$B@)8f$5$l$F$$$^$9!#(BISA Bus $B$O(B 80286 CPU $B@lMQ$N%P%9$@$C$?$H$$$C$F$b$h$$$G$7$g$&!#(B</P>
<P>x86 $B7O$N(B CPU $B$O(B I/O $B%"%I%l%96u4V$r%a%b%j6u4V$H$OJL$K;}$C$F$$$^$9!#(B
I/O $B%"%I%l%96u4V$O(B 16bit $BD9$G$9$,!"(B80286 $B;~Be$N(B PC/AT $BMQ3HD%%+!<%I$N(B
$BCf$K$O2<0L(B 12bit $B$7$+8+$F$$$J$$%+!<%I$d!"(B1 $B8D$N(B I/O $B%"%I%l%9$7$+(B
$B;HMQ$7$F$$$J$$$N$K!"(B8 $B8D$N(B I/O $B%"%I%l%9$rO2Hq$9$k%+!<%I$,$"$j$^$7$?!#(B</P>
<P>PC/AT $B$H$=$N8_495!$N%^%6!<%\!<%I>e$N(B I/O $BAuCV$K$O!"%-!<%\!<%H%3%s%H%m!<%i!"(B
$B%?%$%^!"%j%"%k%?%$%`%/%m%C%/(B(RTC $B;~7W(B)$B$7$+Ek:\$5$l$F$$$^$;$s!#(B
$B%S%G%*!"%7%j%"%k%]!<%H!"%W%j%s%?%]!<%H!"%O!<%I%G%#%9%/!&%U%m%C%T!<%G%#%9%/(B
$B%3%s%H%m!<%i!"3HD%%a%b%jEy$O(B ISA Bus $B$K%"%?%W%?(B($B3HD%%+!<%I(B)$B$rA^$7$F!"(B
$B;HMQ$7$^$7$?!#$3$l$G$O%9%m%C%H$,B-$i$J$$$?$a!"%7%j%"%k!"%Q%i%l%k!"%O!<%I(B
$B%G%#%9%/!&%U%m%C%T!<%G%#%9%/%3%s%H%m!<%i%+!<%I$r(B 1 $BKg$K$^$H$a$?(B
$B%^%k%A(B I/O $B%+!<%I$d!"%5%&%s%I!"(BSCSI$B!"(BCDROM $B%3%s%H%m!<%i!"%8%g%$(B
$B%9%F%#%C%/!&%^%&%9(B $B%3%s%H%m!<%i$r(B 1 $BKg$K$^$H$a$?$*3Z$7$_%+!<%I$H$$$&$h$&$J(B
$B%+!<%I$,EP>l$7$^$7$?!#(B</P>
<P>80386 CPU $B$,=P8=$7$?$H$-!"(BISA Bus $B$O(B 80386 CPU $B$KBP1~$G$-$^$;$s$G$7$?!#(B
$B$^$?!"9bB.$J%a%b%j$O(B ISA Bus $B$KCV$/$H8mF0:n$9$k$N$G!"(BCPU $B$N$9$0$=$P$K(B
$BCV$/$h$&$K$J$j$^$7$?!#$=$N8e!"(B80486 $B$d(B Pentium $B$,=P8=$7(B EISA $B$d!"(B
$B9bB.%S%G%*%+!<%I$KBP1~$7$?(B VL Bus $B$,:NMQ$5$l$?$3$H$b$"$j$^$7$?!#(B
$B$=$7$F!"9bB.$G!"(BCPU $B$K0MB8$7$J$$(B PCI Bus $B5,3J$,EP>l$7!"(BPC/AT $B8_495!$N(B
$BI8=`(B Bus $B$O(B ISA Bus $B$+$i(B PCI Bus $B$K0\$j$^$7$?!#(B</P>
<P>$B?7$7$$(B Bus $B$,(B PC/AT $B8_495!$K:NMQ$5$l$kEY$K(B ISA Bus $B$O>C$($FL5$/$J$k$@$m$&(B
$B$H$$$o$l$F$-$^$7$?!#$7$+$7!":#$N$H$3$m(B ISA Bus $B$O@8$-;D$C$F$$$^$9!#(B
$B$=$NM}M3$H$7$F!"2<5-$K4v$D$+5s$2$F$*$-$^$9!#(B
<UL>
<LI>ISA Bus $B$H<~JU5!4o$N%$%s%?!<%U%'!<%9$,4JC1$J2sO)$G<B8=$G$-$k$3$H!#(B
</LI>
<LI>$B<+:n$N%+!<%I$d!"0B2A$J%+!<%I$,B??tB8:_$7$?$3$H!#(B
</LI>
<LI>ISA PnP $B$K$h$j!"3HD%%+!<%I$N<h$j07$$$,3Z$K$J$C$?$3$H!#(B
</LI>
<LI>PCI $B$,(B ISA Bus $B%j%=!<%9$H=E$J$i$J$$$h$&$K<BAu$5$l$?$3$H!#(B
</LI>
<LI>ISA Bus$B$G==J,$J@-G=$,F@$i$l$kMQES$,$"$k$3$H!#(B</LI>
</UL>
</P>
<P>$B$7$+$7!"(BMicrosoft $B<R$H(B Intel $B<R$NDs>'$9$k(B PC $B$N%O!<%I%&%'%"I8=`5,3J!"(B
<A HREF="ISAPnP-HOWTO-9.html#reference">PC 98 Hardware Design Guide</A>$B$G$O!"(B
ISA Bus $B$NEk:\$O(B<EM>$BIT2D(B</EM>$B$H$J$C$F$7$^$$$^$7$?!#(B
$B:#8e!"<+:n$9$k?M$KBP$7(B PCI Bus $B%$%s%?!<%U%'!<%9MQ(B LSI $B$,0B2A$GDs6!$5$l!"(B
PCI Bus $B$,(B ISA Bus $B$N$h$&$K4JC1$K;H$($k$h$&$K$J$C$?$H$-!"(BISA Bus $B$OL5$/$J$k(B
$B$@$m$&$H;W$$$^$9!#(B</P>
<H2><A NAME="ss11.2">11.2</A> <A HREF="ISAPnP-HOWTO.html#toc11.2">$B8=:_$N(B ISA Bus</A>
</H2>
<P>2000 $BG/8=:_$N(B ISA Bus $B$H(B CPU Pentium III $B$H$O2<?^(B 1 $B$N$h$&$K@\B3$5$l$F$$$^$9!#(B
<PRE>
DRAM AGP USB Super I/O chip
| | | |
Pentium III -- GTL Bus -- North Bridge -- PCI Bus -- South Bridge -- ISA Bus
| | |
+------- IO APIC (interrupt) -----------------------+--------------+
$B?^(B 1 Pentium III $B$H(B 440BX Chip $B%;%C%H(B
</PRE>
<A NAME="fig_1"></A> $B?^(B 1 $B$r@bL@$7$^$9!#(B
<DL>
<DT><B>Pentium III</B><DD><P>$B8=:_$N:G?7(B CPU $B$G$9!#(B</P>
<DT><B>GTL Bus</B><DD><P>$B:G?7$N(B CPU (Pentium II $B$d(B Celeron$BEy$r4^$`(B)$B$N(B Bus $B$NL>>N$G$9!#(BBus $B%/%m%C%/(B
$B$O(B 100MHz $B$G$9!#(B</P>
<DT><B>North Bridge</B><DD><P>CPU $B$H(B DRAM,AGP,PCI Bus $B%$%s%?!<%U%'!<%95!G=$,<u$1;}$A$^$9!#(B
$B7?HV$O(B 82443BX $B$G$9!#(B</P>
<DT><B>South Bridge</B><DD><P>$B@N$N(B PC/AT $B$N%^%6!<%\!<%I$KEk:\$5$l$F$$$?5!G=!"3d$j9~$_!"(BDMA,RTC $BEy!"(B
PCI Bus $B@\B3$N(B ATA(IDE)$B%$%s%?!<%U%'!<%9$d(B USB $B$H(B PCI-ISA Bus Bridge $B5!G=(B
$B$r;}$A$^$9!#7?HV$O(B 82371EB $B$G$9!#(B</P>
<DT><B>Super I/O chip</B><DD><P>$B%U%m%C%T%G%#%9%/!"%Q%i%l%k!&%7%j%"%k%]!<%H!"%-!<%\!<%I!"%^%&%9(B
$B%$%s%?!<%U%'!<%9$r;}$A$^$9!#(B ISA Bus $B$K@\B3$5$l$F$$$^$9!#3F<R$+$iDs6!$5$l(B
$B$F$$$^$9!#(B</P>
<DT><B>IO APIC</B><DD><P>$B?7$7$$!"3d$j9~$_%3%s%H%m!<%i$G$9!#(BPC/AT $B$N3d$j9~$_$r3HD%$7!"(B16 $B8D0J>e$N(B
$B3d$j9~$_$,;H$(!"(BPCI Bus $B$H(BISA Bus $B$N3d$j9~$_$rJL$K$G$-$^$9!#(B
$B7?HV$O(B 82093AA $B$G$9!#(B</P>
</DL>
</P>
<P>$B$b$H$b$H(B 8088/80286 CPU $B$N$=$P$K$"$C$?(B ISA Bus $B$O!"2?CJ$b$N%$%s%?%U%'!<%9$r(B
$B7PM3$7$F!"(BPentium III $B$H@\B3$5$l$F$$$^$9!#(B
ISA Bus $B$N%?%$%_%s%0$O(B $B%/%m%C%/(B 8MHz $B$N!"(B80286 $B;~Be$N%?%$%_%s%0$H$[$\!"(B
$BF1$8$G$9!#(B</P>
<H2><A NAME="isa_problem"></A> <A NAME="ss11.3">11.3</A> <A HREF="ISAPnP-HOWTO.html#toc11.3">ISA Bus $B$H(B PC/AT $B$NLdBjE@(B</A>
</H2>
<P>ISA Bus $B$NLdBjE@$O!"(BPC/AT $B8_495!$NLdBj$H8@$$49$($k$3$H$,$G$-$^$9!#(B</P>
<P>
<DL>
<DT><B>$B%j%;%C%H$NLdBj(B</B><DD><P>x86 $B7O$N(B CPU $B$G(B 8086(8088)$B$HF1$8F0:n$r%j%"%k%b!<%I$H$$$$$^$9!#(B
x86 $B7O$N(B CPU $B$O(B $B:G?7$N(B Pentium III $B$b4^$a$F!"(BCPU $B$r(B $B%j%;%C%H$9$k$H!"(B
$B$3$N%j%"%k%b!<%I$K$J$j$^$9!#%W%m%F%/%H%b!<%I$OMM!9$JJ]8n5!G=$d!"2>A[%a%b%j(B
$B5!G=$r;}$D%b!<%I$N$3$H$G$9!#(B
80286 CPU $B$O5!3#8lL?Na$G!"%j%"%k%b!<%I$+$i!"%W%m%F%/%H%b!<%I$K0\9T$G$-$^$9(B
$B$,!"%W%m%F%/%H%b!<%I$+$i!"%j%"%k%b!<%I$KLa$k5!3#8lL?Na$r;}$C$F$$$^$;$s$G$7(B
$B$?!#(B80286 CPU $B;~Be$N4v$D$+$N%W%m%0%i%`$O%j%"%k%b!<%I$GL5$$$HF0:n$7$J$$$b$N(B
$B$,$"$k$?$a!"%j%"%k%b!<%I$KLa$k$?$a!"(BCPU $B$r%j%;%C%H$9$k%O!<%I%&%'%"(B
$B$r(B PC/AT $B8_495!$KDI2C$7$^$7$?!#%-!<%\!<%I%3%s%H%m!<%i$N=PNO%]!<%H(B
(I/O $B%"%I%l%9(B 0x64) $B$N(B bit 0 $B$K(B 0 $B$r=q$-9~$`$H!"%j%;%C%H$G$-$k$N$G!"(B
$B%-!<%\!<%I%j%;%C%H$H8F$P$l$F$$$^$9!#(B
$B$3$N!"%-!<%\!<%I%j%;%C%H$G$O(B ISA Bus $B$O%j%;%C%H$5$l$^$;$s!#(B
ISA Bus $B$,%j%;%C%H$5$l$k$N$O!"EE8;EjF~;~$@$1$G$9!#(B</P>
<DT><B>I/O $B%"%I%l%9$NLdBj(B</B><DD><P>x86 $B7O$N(B CPU $B$O(B 16 bit $B$N(B I/O $B%"%I%l%9$r;}$C$F$$$^$9!#(BPC/AT $B$G$O!"%"%I%l(B
$B%9(B 0x0000 $B$+$i(B 0x00FF $B$^$G$r!"%^%6!<%\!<%I>e$G;HMQ$7!"(B
$B3HD%%+!<%I$O(B 0x0100 $B$+$i(B 0x03FF $B$^$G$r;HMQ$7$^$9(B($B9g$o$;$F(B 10bit 1024$B%P%$%H(B
$B$K$J$j$^$9(B)$B!#(B
$B$H$3$m$,!"$I$A$i$b(B I/O $B%"%I%l%9(B 16bit $B$r40A4%G%3!<%I$;$:!"<j$rH4$$$F$$$^$9!#(B
$B%^%6!<%\!<%I$G$O!"(BI/O $B%"%I%l%9(B $B$N(B bit15 $B$+$i(B 10 $B$rL5;k$7!"(B
$B$7$+$b!"(Bbit9 $B$H(B bit8 $B$,$H$b$K(B 0 $B$N;~!"A*Br$5$l$F$7$^$$$^$9!#(B
$B3HD%%+!<%I$O(B I/O $B%"%I%l%9$N(B bit15 $B$+$i(B 10 $B$rL5;k$7$F$$$^$9!#(B
$B$=$N$?$a!"(BI/O $B%"%I%l%96u4V$O(B $B%$%a!<%8(B($B%4!<%9%H(B)$B$@$i$1$K$J$C$F$$$^$9!#(B
$B$D$^$j!"%^%6!<%\!<%I$G$O(B 0x0000,0x1000,0x2000... $B$OA4$FF1$8(B I/O $B$,H?1~$7!"(B
$B3HD%%+!<%I$G$O(B 0x0100,0x0400,0x0800... $B$OA4$FF1$8(B I/O $B$,H?1~$7$F$7$^$$$^(B
$B$9!#(B
$B$5$i$K!"(B1 $B8D$N(B I/O $B%"%I%l%9$7$+I,MW$,L5$/$H$b!"%^%6!<%\!<%I>e$G$O!"(B
$B:GDcC10L$G$b(B 16 $B8D!"B?$/$N3HD%%+!<%I$G$O(B 8 $B8D$N(B I/O $B%"%I%l%9$rO2Hq$7$F$$$^$9!#(B
$B$3$N<jH4$-$O(B $B%G%3!<%@2sO)$r4JAG2=$9$k$?$a$K9T$o$l$^$7$?$,!"(B
I/O $B%"%I%l%9$KO"B3$7$?9-$$NN0h$r<h$k$3$H$,$G$-$^$;$s!#(B</P>
<DT><B>DMA $B$NLdBj(B</B><DD><P>PC/AT $B$N(B DMA $B%3%s%H%m!<%i$O(B ($BBg@N$N(B) 8080 $BMQ$N(B 8237A $B$r;HMQ$7$F$$$^$9!#(B
8237A $B$O%"%I%l%96u4V(B 16bit $B!"%G!<%?I}(B 8bit $B$J$N$G!"(B64kbyte $B$^$G$7$+E>Aw$G$-(B
$B$^$;$s!#(BPC/AT $B$G$O!"$+$J$jJ#;($JJ}K!$G(B 8237A $B$r(B 2 $B8D;HMQ$7!"(B
$B%G!<%?I}(B 16bit $B$NE>Aw$,$G$-$^$9!#$^$?(B 8bit $B$N%l%8%9%?$r;HMQ$7!"(B
$B%"%I%l%96u4V(B 24bit $B$K3HBg$5$l$F$$$^$9!#$?$@$7!"0lEY$KE>Aw$G$-$k%G!<%?D9$O!"(B
16bit $B$^$G$K!"@)8B$5$l$F$$$^$9!#(B
$B$5$i$K!"(BDMA $B$NE>AwB.EY$O8=:_$N(B CPU $B$N%W%m%0%i%`E>AwB.EY$KNt$j$^$9!#(B</P>
<DT><B>$B3d$j9~$_$NLdBj(B</B><DD><P>x86 CPU $B<+BN$O(B 2 $BK\$N3d$j9~$_@~$,$"$j$^$9!#(BNMI $B$H(B INT $B$G$9!#(B
NMI $B$O(B $B3d$j9~$_6X;_$K$9$k$3$H$,$G$-$J$$$b$N$G!"<g$KCWL?E*$J%(%i!<(B($B%a%b%j$N(B
$B0[>o$d!"EE8;$,Mn$A$?Ey(B)$B$N;~$K;HMQ$7$^$9!#(B
INT $B$O(B $B3d$j9~$_6X;_$K$G$-$k$3$H$H!"3d$j9~$_H/@8;~(B 8bit $B$N3d$j9~$_%Y%/%?$r(B
$BFI$_9~$`$3$H$G!"(B256 $B8D$N3d$j9~$_$KBP1~$G$-$^$9!#(B
PC/AT $B$G$O(B $B3d$j9~$_%3%s%H%m!<%i(B 8259A $B$r(B 2 $B8D;HMQ$7!"(B15 $B8D$N3d$j9~$_$,(B
$B;HMQ$G$-$^$9!#(B8259A $B$O(B 8$BK\(B $B$N(B IRQ $BC<;R$r;}$C$F$$$F!"(BIRQ $BC<;RKh$KJL!9$N(B
$B3d$j9~$_%Y%/%?$r@_Dj(B($B%W%m%0%i%`(B)$B$G$-$^$9!#(B8259A $B$r(B 2 $B8D;H$&$?$a$K$O!"(B
$B0lJ}$N(B IRQ $BC<;R$rB>J}$N(B 8259A$B$NC<;R$N$?$a$K;H$&$?$a!"(B16 $B8D$G$O$J$/(B 1 $B$DB-$j(B
$B$J$$!"(B15 $B8D$N3d$j9~$_$K$J$j$^$9!#(B
$B$3$l$i$N3d$j9~$_$r%O!<%I%&%'%"3d$j9~$_$H$$$$$^$9!#(B</P>
<P>$B$^$?!"(Bx86 $B7O(B CPU $B$K$O%=%U%H%&%'%"3d$j9~$_5!3#8lL?Na(B($B%K!<%b%K%C%/$O(B INT $B$G$9(B)$B$,(B
$B$"$j$^$9$,!"%O!<%I%&%'%"3d$j9~$_$HF1$8$h$&$KF0:n$7$^$9!#(B
8259A $B$,(B $B3d$j9~$_%Y%/%?(B 8 $B$r=PNO$7!"(BCPU $B$N(B INT $BC<;R$rM-8z$K$7$?$3$H$H!"(B
$B%=%U%H%&%'%"3d$j9~$_5!3#8lL?Na(B INT 8 $B$NF0:n$OA4$/F1$8$G!"(BCPU $B$K$O6hJL$,(B
$BIU$-$^$;$s!#(B8259A $B$N%l%8%9%?$rD4$Y$?$j!"(BIRQ $BC<;R$rM-8z$K$7$?!"%O!<%I%&%'%"(B
$B$KLd$$9g$o$;$F!"%O!<%I%&%'%"$+%=%U%H%&%'%"$N3d$j9~$_$r6hJL$7$^$9!#(B
$B$3$l$O!"7gE@$H$bMxE@$H$b9M$($i$l$^$9!#(B $B7gE@$H$7$F!"%O!<%I%&%'%"$+%=%U%H%&%'(B
$B%"$+6hJL$9$k%W%m%0%i%`$,I,MW$K$J$k$3$H$G$9!#MxE@$H$7$F$O!"%O!<%I%&%'%"$,(B
$BF0:n$7$F$$$J$$(B(bug$B$C$F$$$?$j!"$^$@40@.$7$F$$$J$$(B)$B$H$-$K!"%=%U%H%&%'%"$G(B
$B;n83$,$G$-$k$3$H$G$9!#(B</P>
<P>x86 $B7O(B CPU $B$O%Y%/%?HV9f$+$i7W;;$7$?!"%a%b%jFbMF(B($BL^O@$"$i$+$8$a!"CM$r@_Dj(B
$B$7$F$*$-$^$9(B)$B$r$b$H$K$7$?%"%I%l%9$X%5%V%k!<%A%s%3!<%k$7$^$9!#(B</P>
<P>PC/AT $BH/GdEv=i$O3d$j9~$_$,(B 15 $B8D$b$"$l$P!"==J,$H9M$($i$l$F$$$^$7$?$,!"(B
$B8=:_$G$O!"ITB-$7$F$$$^$9!#(B</P>
<DT><B>Bus $BB.EY$NLdBj(B</B><DD><P>ISA Bus $B$NE>AwB.EY$O%T!<%/$G$b!"(B8Mbyte/sec $B0J2<$G$9!#(B8bit $BI}$N(B I/O $BL?Na$G(B
ISA Bus $B$r%"%/%;%9$7$?>l9g(B 1Mbyte/sec $B$r2<2s$j$^$9!#(B </P>
<DT><B>$BJ,N%$NLdBj(B</B><DD><P>ISA Bus $B$K$O!"$9$Y$F$N%9%m%C%H$K?.9f@~$,6&DL$KG[@~$5$l$F$$$^$9!#$=$N$?$a!"(B
ISA $B%+!<%IKh$K%"%/%;%9$9$kJ}K!$,$"$j$^$;$s!#(B
$BF1$8(B Bus $B@\B3$G$b!"(BSCSI $B$OAuCVKh$K!"(BID $BHV9f$r?M<j$G=EJ#$7$J$$$h$&$K@_Dj$7!"(B
$B$=$N(B ID $BHV9f$r;H$$!"AuCV$r6hJL$7%"%/%;%9$7$F$$$^$9!#(B
PCI $B$G$OAuCV(B($B%9%m%C%H(B)$B$H(B PCI Bus $B%3%s%H%m!<%i$r(B 1 $BBP(B 1 $B$K@\B3$7$F$$$k(B
$B@)8f@~$,$"$j$^$9!#(BPCI $B$G$O!"$3$N@)8f@~$rM-8z$K$9$k$H!"BP1~$7$?$R$H$D$@$1$N(B
$BAuCV(B($B%9%m%C%H(B)$B$,H?1~$7!"F1$8(B Bus $B>e$K$"$kB>$NAuCV(B($B%9%m%C%H(B)$B$OH?1~$7$^$;$s!#(B</P>
</DL>
</P>
<H2><A NAME="ss11.4">11.4</A> <A HREF="ISAPnP-HOWTO.html#toc11.4">I/O $B%"%I%l%96u4V$K$D$$$F(B</A>
</H2>
<P>ISA Bus $B$O(B I/O $B%"%I%l%96u4V$r;HMQ$7!"%O!<%I%&%'%"$r@)8f$7$^$9!#(B
I/O $B%"%I%l%96u4V$X$N%"%/%;%9$K4X78$9$kLdBj$r2<5-$K<($7$^$9!#(B</P>
<H3>I/O $B%"%I%l%96u4V$NLdBj(B</H3>
<P>x86 $B7O(B CPU $B$O(B I/O $B%"%I%l%96u4V$r%a%b%j%"%I%l%96u4V$HJL$K;}$C$F$$$^$9$,!"(B
I/O $B%"%I%l%96u4V$r;}$D(B CPU $B$O>/?tGI$J$N$G$9!#2?8N!">/?tGI$+$H$$$($P!"(BI/O $B%"%I%l(B
$B%96u4V$rJL$K;}$D!"I,MW$OI,$:$7$bL5$+$C$?$+$i$G$9!#(B
I/O $B$N%O!<%I%&%'%"$,%a%b%j$HF1$8$h$&$K!"%"%/%;%9$7$F!"F0:n$9$k$h$&$K@_7W$5$l$F$$(B
$B$l$P!"LdBj$OL5$$$+$i$G$9!#(BI/O $B%"%I%l%96u4V$r%"%/%;%9$9$k5!3#8lL?Na$d!"(B
CPU $B$N?.9f@~$d%"%/%;%9%?%$%_%s%0$K(B I/O $B%"%I%l%96u4V@lMQ$N$b$N$rMQ0U$9$kI,MW$bL5$$(B
$B$N$G!"(BI/O $B%"%I%l%96u4V$r;}$?$J$$J}$,M-Mx$G$7$?!#(B
$B$7$+$7!"%-%c%7%e%a%b%j$NEk:\!"L?Na$N%9%1%8%e!<%i!"J]8n5!G=!"(BCPU $B$N9bB.2=Ey$K$h$j!"(B
I/O $B%"%I%l%96u4V$r;}$DJ}$,M-Mx$H$J$C$F$-$^$7$?!#(B
$B$=$NM}M3$r2<5-$K<($7$^$9!#(B
<DL>
<DT><B>$B%-%c%7%e%a%b%j$NEk:\(B</B><DD><P>$B%a%b%j$O(B CPU $B$N4IM}2<$K$"$j!"%a%b%jFbMF$rJQ99$9$k$N$O!"86B'$H$7$F(B CPU $B$@$1$G$9(B
$B$,!"%O!<%I%&%'%"$OFH<+$K%a%b%jFbMF$rJQ99$7$^$9!#(B
$B%a%b%j%"%I%l%96u4V$K%O!<%I%&%'%"$r3d$jEv$F$k>l9g!"$=$NNN0h$r%-%c%7%eIT2D$K$9$k(B
$BI,MW$,$"$j$^$9!#(Bx86 $B7O$N(B MTRR $B$O%a%b%j%"%I%l%96u4V$K%O!<%I%&%'%"$r3d$jEv$F$k$H$-(B
$B$K;HMQ$5$l$^$9!#(B</P>
<DT><B>$BL?Na$N%9%1%8%e!<%k(B</B><DD><P>$B8=:_$N(B CPU $B$OJ#?t5!3#8lL?Na$rF1;~$K<h$j9~$_!"JBNs$K<B9T$G$-$k$h$&$K$J$C$F$$$^(B
$B$9!#$=$N$?$a!"L?Na$N<B9T=g=x$d!"%a%b%j%"%I%l%96u4V$X$N%"%/%;%9=g=x$rJQ99$9$k$3$H(B
$B$,$"$j$^$9!#%O!<%I%&%'%"$KBP$7!"<B9T=g=x$d%"%/%;%9=g=x$,JQ99$5$l$?>l9g!"8mF0:n$9(B
$B$k2DG=@-$,$"$j$^$9!#(B</P>
<DT><B>$BJ]8n5!G=(B</B><DD><P>$B%O!<%I%&%'%"$,3d$jEv$F$i$l$?%"%I%l%96u4V$G$O!"%a%b%j%"%I%l%96u4V$H$O!"0[$J$kJ]8n(B
$B5!G=$,I,MW$G$9!#%a%b%j%"%I%l%96u4V$G$O!"FI$_=P$7IT2D!"=q$-9~$_@lMQ$O0UL#$N$J$$!"(B
$BJ]8n$G$9$,!"%O!<%I%&%'%"$G$OM-8z$JJ]8n$K$J$j$^$9!#$^$?!"FI$_=P$7IT2D!"=q$-9~$_IT(B
$B2D!"$7$+$7%"%/%;%9$O2DG=$H$$$&J]8n$b%O!<%I%&%'%"$G$O$"$jF@$^$9!#(B
$B$5$i$K!"$3$l$i$NJ]8n5!G=$O%S%C%HC10L$G9T$&I,MW$,$"$j$^$9!#(B</P>
<DT><B>CPU $B$N9bB.2=(B</B><DD><P>CPU $B$,9bB.2=$9$l$P!"%a%b%j$X$b9bB.$K%"%/%;%92DG=$G!"%"%/%;%9%?%$%`$OF10l$G$"$kJ}(B
$B$,!"M-Mx$G$7$g$&!#$7$+$7!"%O!<%I%&%'%"$N%"%/%;%9B.EY$OMM!9$G!"D6DcB.$N$b$N$b$"$j(B
$B$^$9!#%O!<%I%&%'%"$rF1$86u4V$K3d$jEv$F$k$h$j$b!"JL$N6u4V$K3d$jEv$F$?J}$,!"(B
CPU Bus $B$d(B $B%a%b%j(B Bus $B$N@_7W$,MF0W$K$J$j$^$9!#(B</P>
</DL>
</P>
<H3>$B%O!<%I%&%'%"$X$N%"%/%;%9(B</H3>
<P>$B%O!<%I%&%'%"$X$N%"%/%;%9$K4XO"$9$kOCBj$r2<5-$K<($7$^$9!#(B
<DL>
<DT><B>$B%O!<%I%&%'%"$X$N%"%/%;%9$NFC<l@-(B</B><DD><P>$B%O!<%I%&%'%"$X$N%"%/%;%9$O%a%b%j$N%"%/%;%9$H$O!"F1$8$G$O$"$j$^$;$s!#(B
$B2<5-$K$$$D$+$N5!3#8lL?Na$N%3!<%I$NNc$r<($7!"(BI/O $B$H%a%b%j$H$N0c$$$r@bL@$7$^$9!#(B
<PRE>
$B%3!<%I(B 1
load io # io $B%"%I%l%9$N%G!<%?$rFI$_9~$`(B
load io
store io
store io # io $B%"%I%l%9$X%G!<%?$r=q$-9~$`(B
$B%3!<%I(B 2-1
load io
io$B$K%"%/%;%9$7$J$$=hM}(B
$B%3!<%I(B 2-2
io$B$K%"%/%;%9$7$J$$=hM}(B
load io
$B%3!<%I(B 3-1
load32 io # 32bit $BC10L$G%"%/%;%9(B
and 0xff # 8bit $BJ,$r<h$j=P$9!#(B
$B%3!<%I(B 3-2
load8 io # 8bit $BC10L$G%"%/%;%9(B
</PRE>
$B%3!<%I(B 1 $B$,%a%b%j$X$N%"%/%;%9$G$"$l$P!"FI$_9~$s$@%G!<%?$r=q$-La$9$@$1$G$9$+$i!"(B
$BL50UL#$J%3!<%I$G$7$g$&!#(BCPU $B$K$h$C$F$O!"5!3#8lL?Na$r<B9T$7$J$$$+$b$7$l$^$;$s!#(B
$B$7$+$7!"%3!<%I(B 1 $B$,%O!<%I%&%'%"$X$N%"%/%;%9$N>l9g!"$3$NDL$j$K!"(B2 $B2sFI$s$G!"(B2 $B2s(B
$B=q$/$h$&$K(B("$BFI(B $BFI(B $B=q(B $B=q(B" $B$H(B)$B<B9T$9$kI,MW$,$"$j$^$9!#(B
"$BFI(B $B=q(B $BFI(B $B=q(B" $B$d!"(B"$BFI(B $B=q(B $B=q(B $BFI(B" $B$G(B
$B$OF0:n$7$J$$$h$&$K!"@_7W$5$l$?%O!<%I%&%'%"$+$b$7$l$^$;$s!#(B</P>
<P>$B%3!<%I(B 2 $B$O:G=i$K%O!<%I%&%'%"$K%"%/%;%9$9$k$+!"8e$G%O!<%I%&%'%"$K%"%/%;%9$9$k$+(B
$B$N0c$$$G$9$,!";~4V$,7P2a$9$k$H!"%O!<%I%&%'%"$OJL$N%G!<%?$rJV$9$+$b$7$l$^$;$s!#(B</P>
<P>$B%3!<%I(B 3 $B$O%"%/%;%9$9$k$H$-$N%G!<%?%P%9I}$N0c$$$G$9!#FI$_9~$s$@%G!<%?$O$H$b$K(B
8bit $B$NF1$8%G!<%?$G$7$g$&!#$7$+$7!"(B32bit $BI}$N%"%/%;%9$G$O!"(B24bit $BJ,$h$1$$$J(B
$B%"%/%;%9$r$7$F$$$^$9!#$=$N$?$a!"%O!<%I%&%'%"$NF0:n$OA4$/0[$J$k$b$N$K$J$k$G$7$g$&!#(B</P>
<P>$B$^$?!"F1$8(B I/O $B%"%I%l%9$X$N%"%/%;%9$G$b!"FI$_9~$_$H=q$-9~$_$NF0:n$,0[$J$k$3$H$b!"(B
$B$"$j$^$9$7!"%"%/%;%9$5$($"$l$P!"FI$_9~$_=q$-9~$_$rLd$o$J$$$3$H$b$"$j$^$9!#(B</P>
<DT><B>I/O $B%"%/%;%9%W%m%0%i%`$NLdBj(B</B><DD><P>x86 $B7O(B CPU $B$,(B I/O $B%"%I%l%96u4V$K%"%/%;%9$9$k5!3#8lL?Na$r(B I/O $BL?Na$H(B
$B8F$s$G$$$^$9!#(BI/O $BL?Na$N%"%I%l%C%7%s%0%b!<%I$O!"$U$?$D$7$+$"$j$^$;$s!#(B
$B@dBP%"%I%l%9$H(B DX $B%l%8%9%?4V@\$G$9!#(B
$B@dBP%"%I%l%9%"%I%l%C%7%s%0%b!<%I$O!"(BI/O $B%"%I%l%9$rD>$K;XDj$9$k$N$G!"(B
$B5!3#8lL?Na$,(B ROM $B$K=q$-9~$^$l$?>l9g$d!"%W%m%F%/%H%b!<%I$G$O!"(B
I/O $B%"%I%l%9$r=q$-49$($k$3$H$O$G$-$^$;$s!#$^$?!"%"%I%l%9$O(B 0 $B$+$i(B 255 $B$NHO0O$K(B
$B8B$i$l$^$9!#(B
DX $B%l%8%9%?4V@\%"%I%l%C%7%s%0%b!<%I$O!"(BDX $B%l%8%9%?$K(B I/O $B%"%I%l%9$r!"(B
$BEO$;$PNI$$$N$G!"(BI/O $B%"%I%l%9$r=q$-49$($k$3$H$,$G$-$^$9!#(B
$B$H$3$m$,!"(Bx86 $B7O(B CPU $B$O(B CPU $B%l%8%9%?$NLr3d$,8GDj$5$l$F$$$k>e!"%l%8%9%?$,(B
$B>/$J$$$?$a!"(BDX $B%l%8%9%?$rB>$NMQES$K;HMQ$7$F$$$k$3$H$d!"(B
$B%W%m%0%i%^$,(B 8080 CPU $B5!3#8l$K47$l$F$$$k$3$H$+$i!"(B
DX $B%l%8%9%?4V@\%"%I%l%C%7%s%0%b!<%I$O$"$^$j;H$o$l$^$;$s$G$7$?!#(B
Bus$B$,(B ISAPnP $B$K$J$C$F$b!"@dBP%"%I%l%C%7%s%0%b!<%I$r;HMQ$7$F$$$k%G%P%$%9(B
$B%I%i%$%P$,$"$j!"%j%=!<%9$,>WFM$7$F!"$;$C$+$/$N(B PnP $B5!G=$,@8$+$;$J$$$b$N$,(B
$B$"$j$^$9(B($B$=$&!"$$$^$G$b(B) $B!#$?$@$7!"(BIBM PC/AT$B8_495!$G$O(B I/O $B%"%I%l%9(B 0 $B$+$i(B 255
$B$O(B $B%7%9%F%`(B I/O $B$K;HMQ$7$^$9$N$G!"(BISAPnP $B%+!<%I$K$O3d$jEv$F$k$3$H$O$"$j$^$;$s!#(B</P>
<DT><B>$B%P%$%H%*!<%@$NLdBj(B</B><DD><P>$B%(%s%G%#%"%s$NLdBj$H$b!"$$$$$^$9!#(B16bit $B0J>e$N@0?tCM$,(B 8bit $BC10L$G$I$N$h$&$K(B
$B%a%b%j$K3JG<$5$l$k$+$H$$$&$3$H$G$9!#(Bx86 $B7O$N(B CPU $B$G$O!":G2<0L$+$i!"3JG<$5$l!"(B
$B$=$NB>$N(B CPU ($BNc$($P(B 68k $B$d(B Alpha)$B$G$O!":G>e0L$+$i3JG<$5$l$^$9!#(B
$BNc$($P!"(B0x123456AB $B$O(B x86 $B7O$G$O!"(B"AB 56 34 12" $B$N=g$K!"(B 68k
$B$G$O(B"12 34 56 AB" $B$N(B
$B=g$K3JG<$5$l$^$9!#$=$l$>$l$K!"MxE@$,$"$C$F!"(Bx86 $B7O$G$O!"%S%C%H?t$N3HD%$K(B
$B8~$$$F$$$F!"(B68k $B$G$O!"2DFI@-$KIY$s$G$$$^$9!#(B
$B%S%C%H?t$N3HD%$H$O!"8=:_(B 16bit $B$N%G!<%?$r3JG<$9$k$H$-!">-Mh$r8+1[$7$F!"(B64bit $B$N(B
$BNN0h$rMQ0U$7!"(Bxx yy 00 00 ... $B$N$h$&$K!"L$;HMQNN0h$r(B 0 $B$K$7$F$*$/$H!"(B
32bit $B$G$b!"(B64bit $B$G$b!"F1$8@hF,%"%I%l%9$G%"%/%;%9$G$-$^$9!#(B</P>
<P>ISAPnP ($B<B$O(B PCI $B$b(B) $B%3%s%U%#%0%l!<%7%g%s%l%8%9%?$O(B x86 $B7O$N%P%$%H%*!<%@$K(B
$B$J$C$F$$$^$9!#(B
$B$^$?!"F1<o$NLdBj$H$7$F!":G>e0L%S%C%H$N0LCV$NLdBj$,$"$j$^$9!#(Bx86 $B7O$G$O!"(B
32bit $B$N>l9g!"(B bit31 $B$,:G>e0L%S%C%H$G$9$,!"$"$k(B CPU $B$G$O(B bit0 $B$,(B
$B:G>e0L%S%C%H$K$J$C$F$$$^$9!#(B</P>
</DL>
</P>
<HR>
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