Hardware Reviews
INCREASE TR5-Ä0 OPERATlNO SPEED Rod HâiHrn
I have Man e number of mod 11 lea lions 10 the TRS-80 that Intended to Irv croaso (ho clock Iretjuency and thereby increase the operating speed However all ol Iheae moda had one thing In com mon; changing apeada uaually destroyed any program In mamory at the time And then along came Bill ArchOold with a speedup board that allows you to change from taat to alow and beck again whenever yov Ilka The beat part of Bill • circuit ta the fact changes are handled to soft y out TRSSO always cornea up In normal speed when it is turned on. An OUT 25* t will shift to high speed at anytime and an OUT 254.0 wiK return the machine to normal Theee can be gnwn aa dwad commenoa or ihar can be Is
How teat la high TRS-iO clock rows I
■paadT Tha norme! I t 77 Uhr The Ar thia to 2 Si Mhj
How teat la high TRS-iO clock rows I
■paadT Tha norme! I t 77 Uhr The Ar thia to 2 Si Mhj
thsa mod la tor you. A SON
mei e thsa mod la tor you. A SON
mei e
Wiring the apeedup boerd Into your TRS-SO couldn't be e.mp»er aa long aa foulsai nodding aQuaintance with e soioavtrtg iron The boerd, which contains 4 ICs, oomas asaamhlari and ail that you have lo do is run 9 wirea to the Main processor boerd. edd one jumper end cut one (race. My total time waa un der an hour
I could have cut thai time in helf it I hadn't made a mistake Tha connections to the main processor board are made on the solder side while all of tho com ponent identification Is on the opposite side. I got one wire off by s row snd spent a half hour troubleshooting. If you decide to install this board, double check your position on lite boerd before soldering each connection
The trace that needs to be cut it located under the Level II ROM boerd After I pulled oil the double aided tepe thai notds it to piece I discovered thet I could here cut the irece on the com ponent aide oI the boerd etthougn this would have made M e little mora difficult to terminate the CLK teed If you're In doubt aboul tfwa, liven follow the Instructions exactly
AppOcstton Aa intended, tha operating spaed of any and all programs was Increesed by 50% but what sdoui cassette operations7 Is It possible to CSAVE while In the high speed mode end creeta 750 baud tapes? Yes tt «at Programs con be CtOAOed at normal apeed end then dumped si high spaed They muet. of course, be CLOAOed et high «peed from then on.
operation I found II neooeeary to adeanoe votwme tcitfol sughity
hang up is worth the tiM and money
■ 10 •ouÉarfyl tomy CTR4t It's too bad n (toaenl mor* lor diaep to dis» at The disk is so thés lenl rwaPy but if you're mm ma you R forget from t»me to lune '
I don't heve a printer connected to my IRS-SO anymore but einoe ihe printer la the one thet decides when the nest character wlB be aent, spee-vp Jx>uW not effect haiacopy operation« loo have a homebrew HS73? interface running 2400 baud Ihal sends TRS HO pr.grami to my Cromemco 2-2 tor storage and hardcopy priming II wotka the aurne In either mode
An Alternative
II you have already made a apeeoup mod such as tha one described rn r RS 00 Computing. Vol t. flo 2. and llnd Ihal it la necessary to ahut oft the mar nine .n order to ewitch speeds yo-i r m «nil generate 750 bend isp«» ' Domuret. 7B2S Wmowvesi Way, * Oaks. CA 0562ft has ertltten an an> b* • language prog-em celled WfVTf ST~ which he seits lor $7St. YVHirsr •oada BASIC or SVSTEM tu. « **,} baud end then dump* (Nam si Tvj t^aud AM of thia la white the TRS40 r* running at normal epwed You con theo switch speeds and read the fasto» ispea
While thla program ian'1 oeoMMTY If you are using rhe ArcnboJd board I «ht! create aome 750 baud tapes with it for I eating purposes I then toed m I them at high spaed without any problems which proves that it puts the proper data algnala on the lepa
Conclusion*
Bim Archbold, whose ooansae t» Snyder Drive, Mather AFB. CA MM, M'is ras aoeedup boara for S24 (5 which kvrtwdM shipping end handling I th.na thai this la a worthwhile modifie ¿Mon lor the TUMO and ft »a the ftrst one thet t heve mentad to nine «nee I bough- M a» month■ ego Being able to switch hang up is worth the tiM and money
TftMPfUNTMOOUti
There Ml too mwch mat you can say ■a product thai «s «e to um et Products TRS-SO Prtnl MoOu*» The Module is intended to dtwe a Radio Shaeà iC^'i'cicj 77l|l"'e §*tt*ter 4 ec-tly from the Eapeneior Búa c nnector on the reer of the Myboero the tr, akminaâing the need for tie Espar- <a« Interface
Documentation includes I wataliei m instruction!. Theory of Operaron Schematic and Cable Conductor Tat/-« h i si allai Ion Is as eaay aa plugging Ihe Module Into the keyboard -tnd the ..1 Inched 3 foot cable Into the printer wtilch will then reepond to the BASIC UiST end LPRINT commande M is poaslble lo oinii tha module in upside down and mi r" I heve more than one (Muipheral tfiai I connect to the TRS401 maiked TOP In targe white letters on t*e appropriât» tide of the Module to preclude arty mtstakaa
• yvu want Una printer capability but >' i heve need ol the other features of Os í .pension Interface, the AMP Print ModuM can save you COO it is avalisa Nom American Utoo Products. Im» 6SM Tar nef Houston TX 7/074 lor gO'iavv »•»•!»
George flUané
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