JOY 5 *ÿÿh� à�[̶k…òI”z ¶kÐ pÐhLâ9̪I” Y÷%Á³Ðz ¶kZ-–K¥Òi´Z-–K+Lï$ЦI”z ¶{x ULï$ЦI”z ¶zx ULï$ЦI”z ¶yx ULï$ЦI”z ¶xx ULï$ЦI”z ¶x ULï$ЦI”z ¶~x ULï$ЦI”z ¶}x ULï$ЦI”z ¶|x ULï$ЦI”z ¶sx ULï$ЦI”z ¶rx U€ xLayout 0x U ÈpHomeoftheFree LðChapter4ð€ xLayout 0x U ÈP ,p>>>x€ xLayout 0x U Èx€ xLayout 0x U È€€ xLayout 1x U ÈÜ $Layout 1xˆP #(-27systemsthatarearound.  ϸThesesystems,runbyenthusiasts,provideameansof  hconversingwithusersallovertheworldandmanysystemsalso D-providesomepublicdomainsoftwarefordownloading.Whatever,the  3chancesarethatyouwillmakenewfriendsandhavereadyhelpandradvicewithyourcomputingproblems. €È€x€$Layout 1xˆP #(-27=AUX:),followedbythetransmission(PIP  ƒlAUX:=).Oncethefilehasbeenreceived,itcanbe  C,convertedbacktoa.COMfile,usingeitherLOAD.COMorHEXCOM.COM,¸suppliedwithCP/M.€P€x€$Layout 1xˆP #(-27'DigitalResearchcorporation,microswereemergingaspropertools,  %notjusttoysforthesolderfreaks.Oneofthefirstobstaclesthat  *hadtobeovercomewasthatoftransferringdatabetweenthesenewQbeastsandtheir,high-powered,mainframebrethren. )WardChristensenwroteaprogramtodojustthat.Hecalledit  MODEM.Ithadallthenecessarycontrolsforactingasadumbremote �jterminal.Laterversionsincludedfiletransferoptions,usinga.protocolcalledXmodem,devisedbyWard.  N7Theoriginalcodewasre-workedbyothers,principalamongst  'whomwereMarkZieglerandJamesMills.Eventually,itbecameMODEM£7,whichhadmorefeatures,butnotafewbugs!  Fromthispoint,thereweretwoseparatestreamsofdevelopment S<-oneintheUKandoneintheUS.TheUSversionofMODEM7has  8!undergonevariousrefinementsandisavailableasMODEM7xx,whereàthexxindicatesthecurrentversionnumber. In1983,DavidBackofShepperton,rewrotetheMODEM7codefor  I2UKusers,callingitUKM7.Thishasagainbeenadaptedforvarious  aJcombinationsofequipment,buttheessenceoftheprogramisthe  G0sameasDavidBack'soriginalandthereismuchsimilaritybetweendUKM7andtheUSversionsofMODEM7.  Startinguptheprogrampresentsyouwithasimplemenuscreen,  N7withanumberofoptions.Theprimaryoptionsarespecifiedfirst, withthesecondaryoptionsaddingfunctionality.Optionsarespecified@byasingleletterinthecommandline. hx€$Layout 1xˆP #(-27'.Thissavesyouhavingtokeepthe|manualbyyourside,whenusingMEXinreal-time. 4TheSTATcommandbringsupascreenfulof'switches'thatyou  ?(canlaterwithinMEX.Thesecoverjustabouteveryoptionthatyou  iRcouldwant.Youmay,ifyouwish,maketheseswitchsettingsthe  permanentdefaultsettings.Onceyouhavethemasyouwish,justtype  'CLONENEWMEX.COM'andanewversionofMEXwillbesavedtodiskforêyourfutureuse! TheMEXcommandsetis,inreality,amini-languageandyoumay  createtextfiles,usingthesecommands,thatMEXwilluseinsteadof  E.keyboardinput;ratherliketheSUBMITutilityofCP/M.Thisallows  K4youtouseMEXforunattendedoperationsincertaincircumstances  andyoucouldcreateseparatejobfilesthatwouldletyoulogonto  @)aremotesystem,downloadanynewmessagesandthenlogoff-all"withoutyourintervention! *MEXwillletyoudefinefunctionkeys.Upto64characterscan E.beassignedtoakeyandyoucansavedefinitionsinafile,tobex€x€$Layout 1xˆP #(-27slowerthanothercomms.programs.Moreover,theprotocolusedby  +KERMITisunique.ItisnotcompatiblewithXmodemandsoitisnot  3thebestpackagetousewithmanybulletinboardsystems(althoughºtheFIDOsystemdoessupportKERMITprotocol). OnethemoreunusualthingsaboutKERMITisthewaythattalks  N7tothedeviceattachedtoit.Insteadofaddressingitasaserial  $ port,itusesCP/MBDOScallstotalktowhateverdeviceisassigned  XAasAUX:.Thiscanbeanyserialdeviceandtheadvantagetodoing (thisisthatyoudon'tneeddevicedrivers.Allyouneedtodoisto  E.alterthescreenhandlingcodesforyourterminal.Thatmakesita|veryportableprogram! K4Iwouldn'tsaythatKERMITisthebestcomms.programthatI  havecomeacross,butit'suseisalmostmandatoryinuniversitiesso,  G0ifyouhaveaccesstoJANET(theJointAcademicNetwork),youwillålikelyneedthis. *Thereareothercomms.packagesaroundandonethatyoumightX�x€$Layout 1xˆP #(-27