Zaka zingapo zapitazo, wolembayo adayendera msika wa flea womwe umayendetsedwa ndi W6TRW pamalo opaka magalimoto a Northrop Grumman ku Redondo Beach, California. Pakati pa ma TV ooneka ngati chimbalangondo cha polar ndi kuchuluka kwa ma charger a foni ndi zida zamagetsi panali bokosi lamatabwa lokhala ndi loko, chogwirira chamatabwa, ndi cholumikizira cha DB-25 pambali. Pafupi ndi cholumikizira pali chosinthira: theka la duplex - duplex yodzaza. Wolembayo akumvetsa chomwe chiri. Modem. modemu yamatabwa. Mwakutero, modemu yophatikizidwa momveka bwino yotulutsidwa ndi Livermore Data Systems cha m'ma 1965.
Modem ikadali pa msika wa flea. Atangojambula, wolembayo adagula $20.
Popeza si aliyense amene akudziwa kuti modemu yolumikizidwa momveka bwino ndi chiyani, ndikudutsa pang'ono m'mbiri. Vuto linali loti nthawi ina, si mizere yokhayo yomwe inali katundu wa makampani amafoni. Ankayeneranso kubwereka matelefoni. Owerenga omwe adapeza daylap adalumikiza ma modemu molunjika pama foni. Ndiyeno, pamene modemu iyi inapangidwa, izo zinali zoletsedwa kutero. Malinga ndi lamulo la ku America la 1934, kunali kosatheka kulumikiza chilichonse ku telefoni yapanyumba mwanjira iliyonse. Mu 1956, pambuyo pa Hush-A-Phone Corp v. Ulamuliro waku United States umasuka: mwamakina zinakhala zotheka kugwirizana. Hush-A-Phone ndi .
Zinaloledwa mwalamulo kulumikiza zida zosiyanasiyana ku chingwe chafoni pamagetsi ku USA mu 1968 (). Koma mpaka 1978, mwayi uwu sungagwiritsidwe ntchito, popeza mitengo, ndondomeko ndi njira zovomerezeka sizinapangidwe. Chifukwa chake, kuyambira 1956 mpaka 1978, zinali zomveka kugwiritsa ntchito ma modemu olumikizidwa ndi makina oyankha. Pochita, adamasulidwa nthawi yayitali - ndi inertia.
Modem iyi, yomwe tsopano yayimilira pa desiki la wolemba, ndi tsamba lofunikira koma lachilendo m'mbiri. Imayambira yankho la Carterphone ndipo chifukwa chake silingalumikizane mwachindunji ndi netiweki yamafoni. Idapangidwa isanapangidwe tchipisi zambiri zomwe zimatengedwa ngati zapamwamba masiku ano. Mtundu woyamba wa modemu iyi unatulutsidwa patangotha ββββchaka chimodzi pambuyo pa Bell 103, modemu yoyamba yopambana pamalonda. Nachi chitsanzo chabwino cha kuchuluka kwa mwayi womwe ungathe kufinyidwa mu ma transistors khumi ndi atatu okha. Kenako modemu iyi idayiwalika kwa nthawi yayitali, mpaka mavidiyo awiri adawomberedwa, wina mu 2009, wina mu 2011:
Kanema wolemba blogger phreakmonkey adalandira kopi yoyambirira ya modemu yokhala ndi nambala yopitilira 200. Ma modemu oterowo amasiyanitsidwa ndi milandu ya mtedza, mbali zake zomwe zimalumikizidwa ndi nkhunda. Malinga ndi phreakmonkey, mawonekedwewa angagwiritsidwe ntchito kudziwa kuti modemu ili ndi zaka zingati, chifukwa madontho amangogwira ntchito molimbika. Kuyambira ndi nambala ya 850, ma modemu anayamba kuikidwa muzitsulo zamatabwa za teak ndi kugwirizana kwa bokosi. Kenako ziwalozo zinayamba kugwirizana ndi malilime. Livermore Data Systems amafunikira kuti ma modemu azitha kufulumira komanso mwachangu.
Mu 2007 blogger Brent Hilpert anayang'ana mu modemu yotere ndi . Chiwembu chake ndi chosangalatsa kwambiri. Ma transistors onse khumi ndi atatu mu modemu anali okhazikika komanso ofala panthawiyo. Mmodzi wa germanium PNP transistor anagwiritsidwa ntchito kumeneko chifukwa chosadziwika bwino kwa wolemba. Ma transistors amitundu yonseyi akadali osavuta kuwapeza m'malo akale lero. Pafupifupi madola makumi awiri okha - ndipo m'manja mwanu muli gulu lathunthu la transistors lofunikira kubwereza ndendende modemu yomweyo. Zowona, zinanso zidzafunika, kuphatikiza ma transfoma ang'onoang'ono.
M'malo mwake, wina adatulutsa chipangizo cholumikizira mawu kuchokera ku modemu, zina zonse zimagwirizana ndi zolembazo. Pali matabwa atatu pa backplane. Pachiyambi - zonse za PSU, kupatula thiransifoma, chachiwiri - modulator, chachitatu - demodulator. Ma transistors a 2N5138 adalembedwa: Sabata 37, 1969. Sizinali zotheka kutsimikizira ndendende tsiku lotulutsa modemu yokha, koma mwina idapangidwa ndikutumizidwa isanafike 1970.
Kulumikizana kwa lilime ndi groove kumatanthauza modemu yotulutsidwa mochedwa
Wolembayo adagula modemu iyi kuti ayisunge kunyumba. Iyi ndi modemu yamatabwa, koma palibe amene amadziwana ndi wolembayo angaganize kuti ali wozizira bwanji. Ichi ndi chinthu chojambula, momwe muli zinthu zambiri zachilendo. Wolembayo adafuna kukonza, koma adazindikira kuti sizingatheke.
Choyamba, chifukwa cha ichi muyenera kupeza choyambirira choyimbira mawonekedwe chipangizo. Chifukwa chakusowa kwake, alendo obwera ku msika wa flea sankamvetsa kuti ndi chipangizo chotani chomwe chinali patsogolo pawo. Chizindikiro cha Livermore Data Systems ndi nambala ya serial zinali poyamba pa chipangizochi, ndipo tsopano kusowa kwawo kunangopangitsa kuti zikhale zovuta kwa alendo ena kuzindikira katunduyo ngati modemu, chifukwa sali antchito a museums apakompyuta. Ndiko kuyesa, ndithudi, kusindikiza tsatanetsatane wa chipangizo chojambulira chojambulira, koma kodi manja adzafika pamenepa?
Kachiwiri, magawo a ma capacitor ambiri "adayandama" momwemo. Zoonadi, ndizosangalatsa kutenga ndikukonza matabwa onse, koma ngati wolemba akufuna kupeza modemu yogwira ntchito ndi ma pairing acoustic, pali njira yabwinoko.
Ichi ndi kamangidwe kanzeru kotchedwa "", opangidwa ndi Chaos Computer Club mu 1985 poyankha chiletso chofananacho, chomwe chinapitiliza kugwira ntchito ku Germany. Modemu yotereyi ndiyosavuta, ndipo ili ndi mwayi wambiri. Amapangidwa pa chipangizo cha AM7910, chomwe chimapezekabe nthawi ndi nthawi, ndipo chimagwira ntchito mwachangu mpaka 1200 baud. Ndi zotheka kupanga modemu kuchokera zikande pa izo mofulumira kuposa pa discrete transistors.
Mwambiri, palibe chifukwa chobwezeretsa modemu yamatabwa iyi, koma idakhala yosangalatsa kwambiri kuichotsa, kukonza kuwombera chithunzi ndikuyika zonse monga momwe zinalili. Pafupifupi zipangizo zonse zamagetsi zinkawoneka ngati izi kuchokera mkati, mpaka munali ma microcircuits mmenemo. Koma ngati mwadzidzidzi wolembayo akumana ndi chipangizo cholumikizira choyimbira chomwe chili choyenera kwa modemu iyi, iye, ndithudi, adzaganiza kachiwiri: mwinamwake kuli koyenera kukonzanso?
Source: www.habr.com