macintosh@felix.UUCP (03/29/87)
[Macintosh Technical Notes - #113: Boot Blocks] There are two undocumented features of the Boot Blocks. This note will describe how they currently work. --- (This file must be converted with BinHex 4.0) :%941-6%c)%*[Eh3J3Qa[BfYc!&G28N40380"!*!%$I!!!!0P,"S!"J!F!!)!"!# 3!rm!r`#3!`%!!!fi!$J!1!!!$CJ!-!!`!!!0Q!!`!!)!N!0)!%J!N!3#f!)Srq$ riJ,i!NB$"`8S!r`!!J#3!dJ!5!#3"!,B!LJ!!3#3!f3!N!-"!!'3!`#3!`%R$`! "!!%!!LhN!!)ZE2rr!*!&'3'3!!#3)3-!N!-$!*!&!3!!#bS!3!!!##i!$J!-!1l rmJ#,rr)"6[q3"!$rN!8!!3#3!`%!N!8"!!!,DJ!J!!!#T!!'rr)!([rb!1crmJ' krj!'$!!!!`!#!*!$!J#3"3%!!![i!F!!!!Z+!'lrmJ!Hrr)!l2rb!EVrN!8!$J% !&3#3"6J!#J([!!)!N!-+!0,q)!([!HpPFL"TFb"NFQ&RCfPZ)#"d!!%0C3!'!!! +!!!9!!%0!J!'!!!-!!!9!!%0!!!'!!!-!!!9!!%0!!!'!!!-!!!9!*!$"J!!#J% !&3!Gp6%3DSAcV`Re5a$e-ICrE4-Jp-9T&2$3!!B!!!i!!"8!#J(J!!%!N!-+!@J 'J!#3&`B!!!`!!!-!#J(P!`3!N!-+!#J!H!&!!EJ"j3(PEL"TFb"KEQ&XEfG[!&q 3A`d"!!B!!!N!!"8!([6@ac*BX29"bcI'S26P)Bm*m*!!r`m0!"J!!!i"!"8!'3i &!"8!'`i"!"8!("J4!"F!!3d8!!B!!!`!!"8!N!-"%"!!&`!"$@8!"J!!$J!!&J! "$3B!"J!!$!!!&3!"$@%!"J!!$J!!&3!"$8J!"J!!$!!!&3!"$Im!"J!!$J!!&3! `p8(,0mDJp18K$b2c(c(c2`RQpR%!N!-&d2-I#I3P8Jp#TFpVM`d!"J!!#J!!&3! ##3d!"J!!$J!!&3!RpA4b)6$f,hRcV`Rd*I-rBJp+@cK6m*p0C-X2-[,!mamjmim hm0!!"J!!$J!!&3i!!"8!Aj"I$3%!"J!!#3!!&3!"$3!!"J!!$J!!&3!Dp$YMpRF rC`p6pjJKpY$dJ@i28hpk(`d!!!B!!!`"!"8!)28aa6PNpj!!p6Ah8j!!Bj!!p@H 4828'pR'2$3!'!!!-!3!9!"8!#!i!!"8!Aj"I$3%!"J!!#3!!&3!9!!S"j3-%!*! $#J!S!(J"3!'i!H8"j@iJDA-JB@jKE'pRE`+Fp8X3pL95$f+PcfZ!Pm*L%2GlBJK rHK!V%)pjJKpY#aEJphHU$f)3E5&!pL95FrCr,J$d%rH3!-Afhfe6#"`P3"PbFrC `j&pR4[E3phHU"UTIG`pjAh8#8-YMpR%#X3PLB(-#X3pL95$f+PcfZ2,J$d1f2fG cpR!V%)pjJKpY#aEJKrHK"i"XaIEHTiXC$f,hN!$,BrCh2fF#ph81C'pY%K5!F`+ a$f*9)2BUA2Dimk!!+a#P2fF2Ge53!2GQVh83BJTFBR8`mNmimf"c$d+PcfX2-!F jI')B!V%)IhS3A3+a#2HB)IE3X@lcX!!V%2Ge53pfD[G4"L#PaLG6$b6cB(J#X3p f&)G6!rGIEIBK3&d#X3pL95$f+PcfZ2,J$d1f2fGcpR!V%2GK5(8`2hAfhf)8!P$ f)3pR3@)8!VB`mNmamd$bMb6c(c8(J%(&pYpY%j'I+3)DU!+a$e,drdd#82GB%#X 3pfD[G4"L$b6cMcB09!+a#2HB)IE3X@i)IhSI,!8V&2GhJ3+a$hCUpe%')2*2120 JH!IfFe3CmZ!29,%2*2120JTFBR8`8kpj"ZkR'!*3aIEHpe)8J2Gh+`pY9"!VB`m ambmip,"G$e,d(dhbi!m0!!"D!!!-!!!9!5)-!!!@!58-!!!9!A8-!!!@!AF-!!! 9!G)-!!!@!G8-!!!9!GF-!!!@!GS-!!!9!Jd-!!!@!K!-!!!9!N)-!!!@!N8-!!! 9!PF-!!!@!PS-!!!9!PF-!!!@!PS-!!!9!8Ae5a$A5#![Ge#"`P5!A3B2BP8QpLS 3p0E(-PL`PipV"N%2GB'3!#8)*8%(296feLG6"6#eph!P##C#$hAJ+a$&pYlh8K6 bi!p8X3pLTFpVJ-8bCc$hCNGIGB$Q4[E4)8J#YL!V%)pjJKpY$h@"J#8)*N,hAJM hA,"S!V%$Efd3A3+a#2HB)IE3ek(b`#X30[E4"G!V%24R146b`#X3edJJEZTmBR8 `*36h8`BJpL95!RpY(b`#X32hAfhf)8"G!IGK-S!P"UTIGr,!%XmZm0!!"J!!$!! !&3"Xp8X8%'33,hG3pe19chAfd6)C$4B[G8'!A3+a$d*9)23UA2DimZ!29,H!05% 2GhUJNBa(pL%,AhF#XIH3!-pe4"-Upj!!ph92Dr,J$`d!!!B!!!i!!"8!%L-a-6- k)%*[Eh3J3Qa[BfYc$3!'!!!1!!!9!*!$!3`-!!%-$!!"$!`!N!-3!*!$!Gf`)!! "d!!+8`%!&3+Bp"05X8"FaSG6DUpj$h@"hh@Jd@,h9""G!V%2BP8JpLTFpVJ(J#X 3Ef*kF[H3!#8)iFIIH3+f)#X3JF8jC2H3!)Ah8j!!Bj!!pfH481EfFB$f)3DUA') C"L$f*9)#IfdI,J$e5hJ(J*8a$f)G9""JNIB[GICrCa3(J+9T'I,!K3+a#4pLpep RpR&!phHU#PD3!2BKTIG`+a"U)80L%)a"%r,J$e5hJ(J2GB(IGD$93*(f,hAfIfG cpR#&d[Gf33+f)2GB'!+a"U)80L%2GRN9$QpR(b`+IfX3j[CamYfRlR2fF*(feB" 8$fG[E4Mbi!p88'UPaL%#X3JF8j!!pfH48'13!)Ah8j!!pLpeh452,!bf2fF3+a! [Ge$f,hNKJ)*N*cpR"L#PaLG6$b6cJ(-#X3pL95$f+PcfZ2,J$d1f2fF3+a$hCUp e%2+$92E@U[H3!2-2+3*3B$(fGLIhB32hAfhf)8$bMb6dEdEdEdEbN!!P"UTFBK$ f*5X2GRN9"MN)Ah8j$f,hAG&)mZ!23lBrCa!V%2GQVh83*3B1@(*rGK!rGIEIBK3 2+2*2-2-2-2-I+3*3DUA')38kpj!!+a#"a6PNpj!!KIG6N!$f,hAG&2,[$3!!+J! !$!!!&3'r$!!!&J("$!!!&3),$!!!&J)3$!!!&3*N$!!!&J*T$!!!&3"FpAC$FrC r1Jp0E)p#pepR$fe[H305$hG8pV$NAK5[H3I3pjAh8'UPaL%'QA*e0U$QpR'!e8# &pe13!'13!2GRN9mZ!!`!!!`"!"8!#!`!!"8!a[9f3h2fIcS!p8X3e8pYBJBj$IG 6`R8fTbpj"G!V%23P8Jp#TFpVJ2GhUJbf2fF3F`+a$IG5pe3I1`NH%j%m%&-#Yi" ce8pYBR8`pYEhN!$'peJ3pjAh9!j&pR4[E3*3eRS&-0pe,h9"#f5IGf339!phFV$ IG5pe33p6pjJKpY#&d[Gf3I,[$3!-!!!1!3!9!!J1!!!9!*!&!KkJ)!!"-!!L!*! $$!#3!`)Hj#!!!9)!$&S"!!`!$!!#(bJS!!,S!$"D!3!-!"J!!Kp-)!!"JJ!+@J) !N!8#%-JJ!!'Z!#)!N!-3!*!$!LTk)!!"d!!+8`%!N!-"#`X!!5-M!!%2$`!"$`m !!3m2!!%2$`!"$`m!!3m2!!%,#`!"$`m!!Jq#!!%2$`!#$i-!!3X,!!%1$J!"$Ji !!Jk%!!%1$J!"$Ji!!3i1!!)1L!!"$Ji!!3i1!!%1$J!#$SJ!!3i1!!)1JJ#3"3) 3R#!!!GS!)J#3!`X!N!-#+V)J!!(m!'TC!3!M!!X!!KMD+!!#CJ!bA!)!$`!Z!!) I%#!!!U`!$$3"!!m!23!#%33J!!J5!"aF!3!2!%`!!LVH)!!#h!!-A!%!$`"E!!) UpLJ!!B`!)P`"!!m!DJ!#+TBJ!!-B!!aF!3!2!(N!!LUH+!!$*!!`A!%!#`#)!!) I'#!!!eJ!DPN"!!m!N`!#(`!J!!2#!!aF!3!H!+)!!KlJ+!!([!"@A!%!$`$!!!) Hb#!!!X3!$&`"!#d!c`!#(UJS!!U8!*CF!!!,!2`!!K$8)!!%'J"U@3%!!!%(!!) U[L!!")B!)J#3!`i""`!#%)JJ!!+B!!aE!3!i!48!!KPH+!!'j!$B@`%!$J&0!!) 3N!!J!!&f!!aE!3!1!9X!!KmX+!!$cJ!L@`)!$J&T!!)C1L!!!VJ!$&X"!(!"G`! #%,!S!!5S!M!c!3!1!HF!!Kp))!!"DJ!-@`%!$J(e!!)UJLJ!!r!!)PX#!!i#!`! #(YJJ!!&H!!aE!3"`!K%!!Kmi+!!)8!(d!`%!$J+"!!)HH!!!!Y!!$&X"!"`#M`# 3"!J!#N3!8&X!N!-#UJ#3!`)!!!08!*!$"!!!"")!N!-)!!!%K!#3!`)!!!EB!*! $$!!!#$`!N!-8!!!0m!"i5GLrA`!!!3#3!`,l!!!"q`#3!fVF!"N3*ri#1cJ!*!! J!!!"cR2!!&9`!9'm!*!&3(d49%ia-6-J3Qp[G#"#E'pMDh-#!*![R(ZKq`#3"J0 P)J)NS"*8!Nc%!!!$)%J!!M'0!!#PNK!3T!#3"F$r4B$#U@SKF3!+U%+[H$'0Ad( XB`M#%)S0)9V'-B`*'-54&)J!IjchFrdbqXlcl2k-DaMp8#-B3V',h[HplR1Fk8V 1FjcSaM&-lN[eNZ$p*l*$q4N9mNc&cL3#FiJ!!M'0&!#3"#!Z,$XN!!$3!!![rf! J38d!)&"0!$S!N!S"!!!"6!p6G@jNBAN!N!N26@pZC'&j!*!*$e4eCA0NBAN!N!J 29f9NEQ9cC'&j!*!'$e4SGA*cC'&j!*!($dCbD@4KH3#3#3p6BA4eFQ4KH3#3"`p +B@jeBA*j!*!)$dCPBR*eBA*j!*!($deKFQ0S!*!+$d&`FQPX!*!+$deKH3#3$!p +G@jP!*!,$dTeE(N!N!X23A9RGA0d!*!*$e0PF(4PE@*PFJ#3"Jp2Bh4[BQ9b!*! )$dj[GQ9YBQ9b!*!($d4PBf9YBQ9b!*!(rrm!!`#3"#`J!!!J!*!$,#!!N!F"6R8 !N!-B!!X!&`!@!"8!&!#3!`-!!J!%!!8!"J!(!*!$%!mJCA4ZFQpKDA0NE'KMCR! !N!06!"X!"`!K!!i!L!#3!aB!QJ#I!!S!!`!9!*F!"J!%!!m!!!L)!"!!KJ!b!!% !N!-,!*!&!J!,%#`Q"!3r*!3e"cm3%!8-"!!d)#3("!!%"$m!N!-"!*!$![X!!!( l!*!$DJ!#%&3%b!#3!a`!DJ!"58j86!!"!"*69&)J!!)!+J!!rrmJ!*!)!Irr)!! !*!#3"!-Jrrm!!!&d!*!%!Vcrr`!!!C!!!*!%!b(rr`!!!D3!!KkiV"i: ---