Radio Shack 112 Manuale delle Istruzioni

la:{iiirt:Photograph is the completed prolect when burlt wrth the recommended Radio Shack parts This packagecontains only the Printed Circuit Board, a

@Doolrlzo0om!FIGURE 3. IC MOUNTING(o

You are now ready to install the Keyboard to thePrinted Circuit Board. Mount as follows:! Ensure that all of the pins on the Keyboard areSTRAIGHT!nT

TESTINGTo test the ASCII Keyboard Encoder you'll need someform of display that verif ies the codes. lf you have thisequipment available, use it t

Fabrication ProceduresfJ Carefully bend the connector's lettered pins(up) as shown in Figure 4.X Mount the LED's between the following pairs

ASCII ENCG'EIEFIBLUEJUMPERS (4}IIREDJUMPERS (5)+5.0 VDCIEDL^.,^SCHEXIAIIC DIAGRAAINOTE: Be sure to coat the tip of yoursoldering iron with a la

TEST PROCEDURE1. Install the Heep Test Module on the PrintedCircuit Board.2. Connect +S-volt DC power to pin 1 of testmodule connector.3. Connect gro

ASCII ENGclElEFIOUTPUT CODING TABLEThe OUTPUT CODING TABLE is divided into two major sections - NORMAL and SHIFT In NORMAL, theleft-hand column lists

ASCII ENCCIEIEFISHIFTSYMBOLOUTPUT CODE HEXE 26 2s 24 23 2221 20* SOHoo o o o o o 1 o1* BEL o o o o o11107* ENOo o o o o1o1o5* STX0 oo o 0 o1oo2* EOT0

ASCII ENGc'ElEFI,lIloSHIFTSYMBOLOUTPUT CODEHEXE 2625 2', 2322 21 20*FFo o o o1 1ooocTo oIo1o 1128o1 1o o0 o o60CR o o o 01101OD* srx10 o o0

ASiCII ENCCIEIEFIOUTPUT CODING TABLEThe following is a definition of symbol abbreviations of ASCII code in the SHIFT mode of the OUTPUT CODINGTABLE.

1.2.3.4.5.6.7.8.9.10.11.ASCII ENCGIDEFITABLE OF CONTENTSfntroduction ...2Specifications ... . ... 3Description . ... 4Partslist ...5Assemblyoft

TROUBLESHOOTINGNegative or False ASCII:lf you checked your Keyboard Encoder by connectingit to a TV typewriter and typed RADIO SHACK andobtain the fol

the broken copper run or the pad and solder it. Cut offthe excess wire. Once you have confirmed that youhave repaired the hole, protect the wire and l

ASICII ENCC'EIEFIIC MAJOR SECTIONPROBABLE CAUSE,/INDICATION23 Keyboard scanner123Outputs never change.Keyboard not scanned.Defective board.24 O

THEORY OF OPERATIONThe following is a detailed Theory Of Operation of theASCII Keyboard Encoder and its associated circuitry.Refer to the Schematic Di

Notice f ine K on the chart.Zl pin 12 will go high onthe falling edge of the cTR signal. This Flip-Flop storesthe Key Pressed command until the Keybo

In the normal mode, a high out of 215, pin 1, causesZ9 and Z8 to be disabled. This causes data, listed inthe encoder table, to be routed to the two N

The shift lock circuit modifies the codes just as theshift function. The method of holding the shift lockinstructions is slightly different in Flip-Fl

rIIIINoprlru^L^-'IKEYBOARDIDTSABLE IBOt2rlllKEY PRESSED@ol23t5AlrllllBO15ABOrtlltlKEY RETEASED8ot5ABltrlr15ArltsAr1ABcDIoc!mJ€m'nov3oIT{crK

(EOGTC0illtCTOB -?1,, ,- n,26^ l/-.lE-lIOFIrc,4 '{'2525,l'. / gellow'ASCil r(EY80AR0 tC',S USrvcc ilrA,--fi>'sov f t

RAD|O SHACK E ^ DtVtStON OF TANDY CORPORAflONU.S.A.: FORT WORTH, TEXAS 76102CANADA: BARRIE, ONTARIO. CANADA L4M 4W5EILSTON ROAI]WEONESEURY STAfFS WSI

ASCII ENGC'E'EFSPECIFICATIONSMrN. E MAX. UN|Tlnput Voltage: 4.7 5.O 5.5 Volts DCInput Current: 4OO 450 50O mACharacters per Minute Outpu

DESCRIPTIONRefer to Figure 1, Block Diagram.The ASCII Keyboard Encoder uses the scan principleto reduce the amount of logic necessary to fullyencode a

ASC|! ENCC'E,EFIPARTS LISTThis package contains a complete circuit card (Project Board 277-1171 ready for parts to be added. lt alsocontains Inte

ASSEMBLY OF THE PRINTED CIRCUIT BOARDAssembling of the Printed Board consists ofmounting components to the Board. The PARTS LISTnotes the parts you&

ru0-4NK]LHTEDo-Qmzo0o[l!{FIGURE 2. RESISTOR AND CAPACITOR MOUNTING

Mount the following Integrated Circuits:NOTE: You maywanttousesocketsforthelC's-if so now is the time to mount them.1. Install the Integrated C