Heathkit H9, Manual

Page 1: ...n ffiuAt for the VIDEOTERMINAL ModelH9 oPERATION 595 2017 03 l I HEATH COMPANY BENTON HARBOR MICHIGAN ...

Page 2: ... t We wurant that during the first ninety 90 days after purchase our products when correctly assembled calibrated adiusted 3 and used in accordance with our printed instructions will meet published specifications If a defective part or error in design has caused your Heathkit product to malfunction during the warranty period through no fault of yours we will service it fiee upon proof of purchase ...

Page 3: ...Heathkit Manual for the VIDEO TERMINAL ModelH9 oPERATION 595 2017 03 HEATH COMPANY tsENTON HARBOR MICHIGAN 49022 Copyrlght 1977 HeathCompany Ail RightsReserved Printed in tho United Stat 8 of Amorica ...

Page 4: ...leshooting Charts TroubleshootingWaveforms Shipping Information 4 5 8 B 10 L2 26 26 26 27 28 30 30 32 CIRCUITDESCRIPTION BasicOverview 47 PowerSupply 48 VideoCircuits 48 CharacterGenerator 50 KeyboardCircuitBoard 54 RAM and Counter 55 Timing and Processing Unit TPU 57 Input Output I O 66 SEMICONDUCTOR IDENTIFICATION ComponentNumberlndex 68 PartNumberlndex 71 ROMandPLA Programs 85 X RAY Views Illus...

Page 5: ...eto a paper tape reader punch The Video Terminal can be used with any digital computer in a dedicatedformat in a stand aloneap plication or in a time sharing system It lets you communicatewith a digital computerin higher level language Basic Assembler etc rather than just using toggle switches The Video Terminal is also much faster up to 9600 baud than the standard electro mechanical teletypewrite...

Page 6: ...sdo not transmitASCIIcharac ters they only affectthe display CURSOR CONTROL KEYS Thesekeys are on the far right of the keyboardand they are labeledwith arrows Thesekeys move the cursor one characterposition or one character line as indicated by the arrow HOME This key movesthe cursorto the first characterloca tion on the first line ERASE EOL End Of Line This key erases the text from the current cu...

Page 7: ...r returns to and flashesat the start of page position Further typed entries will write over the existing text on the first line Also referto Hold Screen on Page8 SPECIALFUNCTION KEYS RETURN Carriage Return This keymovesthe cursorto the first character posi tion of the line it is currently in and it transmitsthe ReturnASCII code controlM Returncanbe written into a RAM locationonly if that locationc...

Page 8: ...riagereturn is written into RAM but the cursordoesnot move Any control characterthat appearsin the text will flash Even though the lower casealphabeticcharacters cannotbe generated from the keyboard they canbe LI NE BINARY VALUEI27 LIN BINARY VALUEO entered into RAM from the digital computer Like all other characters the binary value of the lower case characters is stored in RAM and the dash is d ...

Page 9: ...M screen startingfrom the cur rent cursorlocation and proceedingto the end of the page When it has completed the page the cursor returns home and the transmit pagemode stops The datais transmittedsimultaneouslyoutboth the paral lel and serialports at a ratedeterminedby the slower of thetwo ports PresstheBREAKkey to interrupt the transmit pagefunction CTRL Control Whenthis keyis usedin conjunctionw...

Page 10: ...3showsthe con trol andnormal characters thattheTerminal can generate HOLD SCREEN If the screenhas been filled and a scroll function should occur but can t becausethe SCROLLkey is not pushedin theTerminal goesinto the hold screen mode The cursorreturnsto the startof pagelocation andblinks All externalinputs aredisabledwhen this occurs Datacanonly betransmitted out of the Termi nal by the keyboard T...

Page 11: ...how to interface the HeathkitH9 Video Terminal to the HeathkitHBDigi tal Computer Refer to this section if you have the Heathkit Computer System If you are using a non Heathkit digital computer with your H9 Video Ter minal referto the GeneralInterfacing sectionand selectthe suitableinterfacescheme ...

Page 12: ... 232C 8 Bits None To do this 1 Examine the I O circuit board in the H9 Video Terminal to make sure it is wired as shown in Pictorial 2 1 2 Examine the Serial I O circuit board in the HB Digital Computer to make sure it is wired as shown in Pictorial 2 2 3 Examine the interconnecting cable be tween the H9 and the HB to make sure it is wired as shown in Pictorial 2 3 Illustration Booklet Page 3 il s...

Page 13: ...lr7 9600 i Oi caoo l44aft tx J n I lr 4 PosERrx u 3oo fi 4 MODEL H8 5 H8 H9 H9 LOCATION Circuit Board Rear Panel Rear Panel I O Circuit Board PLUG NUMBER P702 P3 Serial I O Connector P603 DATA DATA GROUND prNNo I rt o I ptNNo I plNNo l ll g Blu g Red Blk 9 g Org g Wht Grn 1 e Red 111 g Nyy1 Q PICTORIAL 2 3 ...

Page 14: ... help you interface the Terminal with your particular system Always removethe IiO circuit boardfrom the Termi nal before you make any wiring fprogramming changes EIA RS 232CSerial Input Output The Terminal is initially wired for an EIA serial in put output Pictorial 2 4 shows the jumper wires necessary for this configuration The EIA input levels are shown in Pictorial 2 5 A spaceis defined as a po...

Page 15: ...Page 13 EIA Connections 27On I r _lq 3l I I I PICTORIAL 2 6 ...

Page 16: ...own in Pictorial2 8 A mark is de fined asa logic 1 and a spaceis definedasa logic 0 TTL INPU LEVELS 5 t A 4 0 TTL OUTPUT LEVTLS PICTORIAL 2 8 Pictorial 2 9 shows the partial schematic of the TTL wiring on the I O circuit board The jumper wire that disablesthe reader control is shown in pictorials 2 7 and 2 9 Refer to Reader Control on Page 18 E c oeoirs I iL Vi icersI MARK LOGIC 1 SPACE LOG I C O ...

Page 17: ...Page 15 TTL Connections z I I _ J tc604 4 43 808 G 8 99l L sea ar our I TTL OUT 12v O I I tt I eoe r ll vl I I aa ne zl t IOOO v TTL IN PICTORIAL 2 5 ...

Page 18: ...e pictorial Z_tO shows the jumper wires necessaryfor the TTy pas_ sive configurationon theI O circuit board A maik is definedas20mA flowing in the currentloop A space is defined as lessthan 4 mA flowing in the current loop Pictorial2 1 1 showsthe partial schematicof the TTY passive wiring The jumper wire that disables the reader control is shown in pictorials 2 10 and 2 11 Referto ReaderControl on...

Page 19: ...TTY Passive Connections 1c604 443 604 I I CURiENT LOOP IN I I I I ___ J PICTORIAL 2 11 ...

Page 20: ... in Pictorials2 1 2and 2 t3 Referto ReaderControl on this Paee READER CONTROL The readercontrolcircuit is a serialhandshakethat allows a computer to control a paper tape reader throughtheTerminalSerialI O Normally thereader control is accomplishedby connecting the tape readerto theparallelI O ofthecomputer If thisis not possible and if the computerhasa spareserialport thetapereadercanbeconnected t...

Page 21: ...ry TTY Active Connections SERIAL OUI I I ___ J CURRENT LOOP OUT I I CURRENT LOOP IN I i I Q604 417 t PICTORIAL 2 I3 ...

Page 22: ... 48OO BAUD r oI T I I n n ir l t tl 1__J l fi Ft I ot I 3t I ll PICTORIAL 2 I4 CONNECT TOLUG3 FOR CONNECI TOLUG2 FOR GREATER THAN 60O 6 6 i i 0l 1____l t rE6 t i Ft I otl t I ol I Hl I ll r98 o z n t l r l L 85 I S r nll i r 0l ll fi oo t i l I l I Hl I II fi 0l 1__J t T56l t 5t I sl I tl r98 fi orzr Y la I l L Detail 2 74A ...

Page 23: ... oE o o Nl o o N o m PICTORIAL 2 16 The Terminal was initially wired for an 8 bit word You can however changethe word length to suit your particular application To do this remove the wires from the holes labeled N1 and N2 on the I O circuit board Then install wires to correspondto the word lengthyou desire Pictorial2 15showshow to connectjumper wires to selecta 5 6 7 or 8 bit word The four holesdi...

Page 24: ...eat Rate instructions in the Readjustment section of this Manual if you want to change the repeat rate TYPICAL TERMINAL COMPUTER SYSTEMS Parallel Input Output Connections ThefollowingparallelI O connector chartdescribes the signal on each pin ofthe parallel I O connector on the rear panel Odd EvenParity EVENPARITY ODD PAR Y t 0 ctRcutl BOARD ffiJ oNlo o o N2o o oP o o ao o Nl o o o N2o o oP o o PI...

Page 25: ...V max Low Level Input Current Irr 2 8 mA max Referto the HandshakeTiming section 20 DAV DataSent Input DataAvailable Normall5rhigh The externaldevice will pull this line low to indicate that there is dataready to be inputted to the parallel input o High Level Input Voltage Vrrr 2 V min o Low Level Input Voltage Vrr 0 8 V max o Low Level Input Current Irr 1 8 mA max o Referto the HandshakeTiming se...

Page 26: ...lZl susk_PULSESAYS I VE TAKEN THEDATA t l PICTORIAL 2 IB Serial I O Connections Thefollowingserial I Oconnector chartdescribes the signals on each pin of the serial I O connector on the rear panel PIN SERIALPORTNOMENCLATURE TTY ACTIVE AND PASSIVEI EIA RS 232C TTL 7 SerialOut Serial Out 2 SerialOut Serial Out 3 SerialIn Serial In 4 SerialIn Serial In 5 ReaderStart 6 ReaderStart Baud RateOut BaudRat...

Page 27: ...ial 2 20 shows the typical I O connectionsbe tween the Video Terminal and a paper tape reader punch Typical Computer Systems PICTORIAL 2 1 5 Typical I O Connections TAKF DATA DATASINT PICTORIAL 2 2O H9 VIDEO TERMINAL SFRIAL 4 8 H8 COMPIJ TER PARALLFL PUNCH H10 I 5 I 4 RTADFR Hr0 H9 t 0 CONNECIOR PIN NOS ID PUNCH DT DATATAKEN DATARECEIVED DR READER L DATA l DS ...

Page 28: ...shown in Pictorial3 1 To adjust the focus 1 Removethe cabinetshell and setit aside 2 Fill the screenwith characters 3 Adjust the FOCUScontrol to obtainthe best focus Look at the charactersat the edges and cornersof the screenasyou make this adjustment 4 Reinstallthe cabinet shell CENTERING The display should be centered on the screen It should havethe sameamount of spaceon the right as it doeson t...

Page 29: ...rcuit board is shown in Pictorial3 1 I lt ilIli ll 6 e e e _BRtGilTlttss To adjust the height of the display 1 Remove the cabinet shell and set it aside 2 Fill the screen with characters 3 Turn the HEIGHT control through its range while you watch the display Leave the con_ trol at the position that provides the most appealing display If you prefer a large dis_ play make sure all twelve character l...

Page 30: ...d extra wide settings are usually required only in low line voltageareas WARNING There is high voltage present on the video circuit board DO NOT attempt to changethe width jumper when the power is turned on To changethe display width 7 Turn the ON OFF switch to OFF 2 Removethe cabinet shell and set it aside 3 Remove the video circuit board from the chassis 4 Pull the jumper wire out of the connect...

Page 31: ... ll I rll ll A f L I l I 1 z z E ol ll r i L 3Ol R A i ll li I il ll I ll ll wrDrH ll ll I ll ll j o il ll I ll lt el ll I lll l ll I llll sll B r_ UU GD s cDl rn lol 6t ll lEl l r l 8fF A l l roKi l l lol tol 2700 F t l T rSlFlr r t8 llt I F TH IC 301 lpll ll s glii V i iiiiivT El r rrs H il llE iill I 3illao I lr I II IUU F GD o5o7 t ll II ll GD ir l l r VIDEO CIRCUIT BOARD PICTORIAL 3 2 ...

Page 32: ... which one best suits your needs To changethe repeatrate 7 Turn the ON OFF switch OFF 2 Removethe bottom panel and set it aside 3 Pull the jumper wire out of the connector pin 4 Insert the jumper wire into the connector pin that correspondsto the repeat rate you desire 5 Reinstallthe bottom panel CLEANING You canuseany mild householddetergentand a soft cloth to cleanthe cabinetof theVideo Terminal...

Page 33: ...PE RE tD 4 p Ju il to N o o In o N N N F t b iltb I v D rp I v _A 2 btDl b I P l I r 1 rlg ril IH ru _ fr tffi rtrtr r i I I I Jl t n n n nl tffitrFF ltrFFlf1l IFll l l l ll ll IHHF ll se Eo e E o PICTORIAL 3 3 ...

Page 34: ...t input 8 bit output 4 handshakes Interfaces BAUD Rates Seven userselectable 11 0 300 600 L200 2400 4800 and 9600 5 x 7 dot matrix ASCII upper case alphabet num bers and punctuation OperatingTemperature 0oto40oC PowerRequirements 120VAC 50 60Hz 50 watts 24OVAC 5O16O H2 50 watts VoltageRequirements L20VAC 100 135VAC 50 60Hz 240VAC 2oo 27oVAC 50 60Hz Dimensions 15 518 Wx 2o 3l4n D x 12 l2ttH 39 7x 5...

Page 35: ...componentsas sociatedwith the problem In many cases thenameof the circuits involved with the problemarealsogiven this will help you relate a problem to the Schematic and Circuit Description The third section titled Troubleshooting Waveforms provides severalimportant waveforms and their respective testpoints If the CRTscreenis blank alwayscheckthe horizontaland verticalsvnc waveforms The fourth par...

Page 36: ... that are bridged until the excess solder flows down onto the tip of the soldering iron Check each resistor value carefully A resistor that is discolored or cracked or shows any sign of bulging would indicate that it is faulty and should be replaced 4 5 6 7 Besureeachdiodeis installedwith the banded end positionedcorrectly Checkall componentleadsconnectedto the cir cuit boards Makesurethe leadsdo ...

Page 37: ...lct02 2 D101 D104 3 C1 4 s volt reference ground not groundedat P101 6 4 No 12 volts or it measures too highortoo low 1 lf the 26 voltsupplyisbelow 15 volts the 12 voltsupply willalsobe low 2 lf the 26 voltsupplyis OK check1C104 and the 12 volt reference ground 5 No 12volts or it measurestoo highor too low t 2 3 4 5 1c105 R105andR106interchanged or wrong values D109 D1 12 C107installed backward 12...

Page 38: ...4 Videoiblankingchainonthecharacter generator circuitboard 5 Brightness controlR338turnedup 13 lnsufficient brightness or contrast 1 Q308 Q309 2 R342 R343 3 C328 C329 4 Checkgridvoltages 14 A single bright horizontal lineappears onthescreen 1 Verticalamplifier 2 Deflection yoke vertical 3 Q301 0306 4 lC221A V sync on the charactergeneratorcircuitboard 5 1C216 sync frame counter on the character ge...

Page 39: ...putenablealwayson Checkitemslistedunder2 above 4 UARTilDE enablealwayson Checkitemslistedunder2 above 22 Sameline is repeated12 times 1 12 counternot cbuntingup 2 1c519 lC511C rcs158 rC716A rC715C 23 Blocks of charactersare repeatedleft to right 1 2 4 counternot counting 1c513 lc5148 lcs10C 24 Writestwo characters 1 Full Duplexkey set for half duplex released insteadof full duplex pushedin 25 Char...

Page 40: ...1C pulse 1C728 3 Cursormovementlatcheson the keyboard 1C407 1C408 4 Q401 35 Cursormovescontinuouslv 1 Cursormovementlatchesnot beingreset 1C407 1C408 Make sure TPU cycle13J resets all four latches 1C407 1c408 z 36 960cursors 1 lc710c 2 Character generator cursorchain lC201C 1C202 lC208A lc218B 37 Wrongcursormovements from cursorcontrols 1 5701pluggedin backward 2 Wiresin plug 5701 interchanged 38 ...

Page 41: ...ction 1 tc723B tc740A I O PROBLEMS CONDITION POSSIBLE CAUSE 46 No serialinputor output general 1 Serialcableincorrectly wired 2 l O circuitboard not jumper wiredfor the properserialconfig uration 3 Wrongbaudrate 4 No baudrate 1C601 lC6O2 1C607 C6O8A 5 UART1C612 6 UARTpinsNP NBl NB2 or EPSincorrectly wired umpers 7 Off Linekey pushedin 8 Readerstart must be operative Q604 must have the base grounde...

Page 42: ...s 55 No parallelinput 1 2 3 Inputbuffer 1C620 lC608C xBE 1c707A lc713A tc702 56 Noparallel output 1 Output latches 1C621 1C622 2 Loadparallel signalfrom1C702 3 Checkthehandshakes seeitem54above 4 XBE lC707A lC713A XBE is generated fromthe UART TBMT XBE parallel FDTI lXae andreadercontrol Ail threesignals mustbe highforXBE 57 No handshake 1 Check handshakes see item il above 58 Noechobackonfulldupl...

Page 43: ...ase 1C724is OK if eitherthe scroll count up or the scroll erase work 68 The erased line the erased block or the cursor moveto the wrong position after a scroll operation 1 Noscroll countup 1C506 1C522 2 Nocountupscroll 4 scroll 12signal trom1C724 since the samepinot 1C724 controls boththescrollcountupandthe scroll erase 1C724 isOKifeitherthescrollcount uporthescroll erasework 3 The47Oresistor betw...

Page 44: ... page 1 XP flip flop notbeingset lC731C lC731D lC732C lC732D 2 7C oulse 3 No OB2XPloadpulse lC701A lC701B lC704A 1C702 No OB2 pulseinto1C702 4 Countup not happening Duplex key in Full Duplex pushedin insteadof Half Duplex released 1c704 tC725A lC719C fakeDAV 82 Transmitpagewon tstoo 1 lc7259 lC721A 2 Transmitpagewasstartedintheholdscreenmode Pressand release theScrollorBreakkeystoexitthetransmitpa...

Page 45: ...to compare the time related signals to the TPU timing signals Timing Diagrams 7 4 in the Illustration Booklet Pages3 through 6 and the Circuit Description will alsohelp you understandthe timing relationshipsof the Terminal functions s20 2 P302 8 HOR IZONTAL SYNC Time cm l0uSEC l 12 9 USEC 51 6 SEC 6V 4V 2V V Volts cm ...

Page 46: ...Pase44 4 ImSEC I l2 4mSEC i r VERT BLAN s202 13 l ImS c r l 2 J F I4 mSEC ry RT SY c s20 4 L Volts cm Time cm 2mSEC I _l t s70 IO v l s703 1 szoz tt tr Volts cm Time cm 5mSEC ...

Page 47: ... until the trace appearsas shown This puts eachTPU pulse 0 thru 7Jin its own centimeter division pulse 0 in the first division through pulse 7 in the eighth division thenarepeatof pulse0 in theninth division etc This letsyou relateothertiming sequences to the variousTPU cycles Referto the TPU Schematic for the locationof eachTPU pulsetest point ilJ 1 r 2 r t_i_l L 2_r LqJ il l ilr 1j V ...

Page 48: ...ed 3 Removethe anglebracketsfrom the chassis the brackets that support the top of the CRT Do not sendtheseparts 4 Removethe Videocircuit boardandthe I O circuit board from the chassis Carefully wrap these circuit boards to prevent them from being damaged Tape a small piece of cardboard over the speaker to protect the speaker cone Install all remaining panels components and hardware Refer to the Cu...

Page 49: ... and a high vol tage power supply or flyback system which is oper ated from the video circuits The character generator has a master oscillator and dividers that generatethe timing signals for all of the functional modules within the Terminal Basically the character generator takes data from the RAM Random Access MemoryJ and converts it from B bit parallel ASCII information to serial dot informatio...

Page 50: ... to diodebridgerectifierD10bthroughD108 The 36 volt output of the bridge rectifier is filtered by capacitor C2 This 36 voltsupplyis oneoftheoutputs of the power supply POWERSUPPLY VIDEO CIRCUITS IC103 is a 2O voltregulator but its output is pro grammedby resistorsR103 and R104to supply 26 volts ICto3 drawsits input currentfrom the baseof transistor Q101 Q101in turn providesthelargercur rentsrequir...

Page 51: ... C322 continues to increase This action producesa near linear change decrease in current which causesa linear changein the yokefield As the yoke field decreases the electronbeammovesfrom the left toward the center of the CRT screen Beforethe yoke current reacheszero at the centerof the screen transistorQ1 is turned on by the horizon tal oscillator TransistorQ1 alsokeepsC321out of the circuit Curre...

Page 52: ...BBBBBBBBBBBBBBBBBB cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGCGGGGGGGGGGGGGGGGGGGGGGGGGGGGG HHHHHHHHHHHHHHHHHHHHHHHHHHH...

Page 53: ...ix leastsignificant bits of the 7 bitASCIIword areusedto addressthe charac ter generator Sixty four charactersare storedin the charactergeneratorROM eachat its own addressas shown in Pictorial 4 4 For instance the 6 bit ASCII word oOto00addresses the characterH CHARACTER As ADDRESS Ae Ar Ao As Aa o o o o I o I I o I I o o I o I o I I I ooo oo I o I o oll roo rol tto ttl HHffiffiffiffiHffi ffiffiHf...

Page 54: ...ich is stored in the cursor latch is coincident with the address coming from the RAM address counter TECHNICAL DESCRIPTION The masterclock of the entireTerminal is locatedon the charactergeneratorcircuit board and it is com posedof IC210B crystalY2O 1 and transistorQ201 The clockfrequencyis 12 395MHz The true and the complementedoutputsareprovided for the dot clock and the other systemtiming lC s ...

Page 55: ... dots 4 times a second causing the characterto appearto blink on the screen In the plot mode the first 128scanlines areusedto display information that correspondsto the binary valueof a 7 bitASCIIword In this mode the first row of charactersthat would normally be seen on the screenis repeated4 times starting with the 129th scanline in the 9th 10th 11th and 12th character lines In the spacedirectly...

Page 56: ...ve true logic by inverter bufferIC403 to provide positive truelogicfor thebus Thetablein Pictoriala 6 Illust ration Booklet Page9 showsthe 7 bitASCII codes inputs of a 3 inputNAND gate IC222B and anyvideo information 0 s will appear at the output of lC222B as logic 1 s This is the composite video output The vertical blanking information appears as a negative logic signal at pin 3 of IC21 7 A The b...

Page 57: ...278 form an addressde coder that eliminates unused address codes and re dundancies and decodesthe 11 bits down to 10 bits The 1k x B memory is made up of two 1k x 4 memories IC507 and IC516 whose 10 inputs are connected in parallel The chip select inputs eSJ and the write enable inputs WE are also connected in parallel When the write inputs are high and the chip select inputs are low eight bits of...

Page 58: ...tedwith it The 20 module has count up count down load and clear inputs and two inputs that determine whether it cascades into the 4 counter or the 1 2 counter The load input loads the outputs of the 20 counter with the data contained in the 5 bit cursor latch IC501 and IC521D The clear input sets all five bits to logic 0 The 20 4 control connects the carry and borrow outputs of the 20 counter to t...

Page 59: ...ming Diagram 3 illustrateshow the A B and C outputs and FIrgener ate a seriesof non overlappingpulses Thesepulses are labeledOthru Z and eachdefinesa specifictime for a particularTPU operationto occur The 0 1 2 and 7 cyclesaresubdivided evenfurther by ANDing them with the C IC710B IC728 and B IC710A IC718C outputsof the horizontalcharactercounter 1C215 on the charactergeneratorcircuit board In gen...

Page 60: ...rd 5707 pin 7 The 4 EOL input is logic 0 when the count in the 4 counter is 3 The EOL and auto carry signalsdefeatthe C U zo signal whenever the auto carry function is not selected Short Form In short form the cursormovesfrom the left to right through a block of only 20 charactersbefore being returnedto the startposition of the next line When it fills up a block of zqO characters it moves to the t...

Page 61: ... ROWS 0 I 2 3 4 E 6 7 8 9 ll I 0 I 2 3 A 5 6 1 8 g 0l I 4 ADDRESS LOCATIONS BLOCKS OF PICTORIAL 4 8 3 X I2 CHARACTERS 23 BLOCKS OF20XI2 CHARACTTRS I 2 20 20 ADDRFSSLOCAIIONS VIDUAL CHARACTFRS 0l I ADDRTSSLOCATIONS PICTORIAL 4 9 20 ADDRFSSLOCATIONS INDIVIDUAT CHARACTERS 0 I 2 3 4 q 6 7 8 I 2 20 0 I I ADDRISS LOCAIIONS BLOCKS OF PICTORIAL4 10 3 x l2 CHARACTERS ...

Page 62: ...in IC7158 TheoutputofIC7158drivesoneinput pin 5 of NAND gate IC741B The other input pin 4 is driven from the Q output fpin 8 of flip flop IC733C and D which is normally reset Q 1 If the Scroll key is pushedin 5704pin Z logic 0 the output pin 6 oflCT418goeslow to indicateto the restof the TPUthata scrolloperationshouldoccur Ifthe Scroll keyisup released theoutput pin 3 of IC739Agoes low and setsfli...

Page 63: ...rocedure stops While erasing was going on TPU cycle 3 counted up the scroll counter to move the start of page address to the next line or block of characters SeePictorials 4 72and 4 13 Illustration Booklet Page10 for asummaryof the scrolling oper ation ERASING Erasingthe page or erasingto the end of line are accomplishedin basicallythe samemanner as the scrollerase Thewrite S705 8 andcount up S705...

Page 64: ...heD output 5707 2 of the scan row counter counts up the 12 counter 4 C775 pin 8 However when the verticalblanking signalappears Vn fromIC705D pin 13 thecountup is defeated whenthepin 2 input to IC71OA is logic0 for the duration of theverticalretracetime The count up is alsodefeated when the Terminal is in the plot modeandthefirst characterline is the only onethatis displayed IC722D and lC722C cont...

Page 65: ...ded into the UART and the parallel output buffers In the plot mode all characters are written into the RAM In the normal mode the only control character that can be written into the RAM is a carriage retutn but only if there is a spaceat the cursor location Flip flop lC7O4Bchecks for a space indication before the carriage return is written After all input conditions have settled TPU cycle 0B2 enab...

Page 66: ...locks the logic 1 at the D input through IC706B and starts an artificial vertical retrace period through ICTOSD pin 13 This stops the screen refresh cycle and the TPU can service the incoming data within approximately one half millisecond It stops the cycle by stopping the count ups and blanking the screen The 12 count up is defeated by forcing an input pin 2 of lC776A to a logic 0 The screen is b...

Page 67: ...s soonasthe flip flop is cleared the character transmissioncycle can start again for the new line When the cursorreachesthe end of the pageand after it hasbeencountedup to the startof pageposition a scroll possibility exists and a scroll command is generated However sincetheQ output pin 8 of the transmitpageflip flop IC731C and IC731D appears at oneinput pin 2 of IC7a1 A the scroll is inhibited Th...

Page 68: ...finishedreadingthe data a negative going pulse is transmitted to the RTEV6 input I O Input Output The serialinput and output canbe jumper wired for standardTTL EIA orTTY 20mA currentloop input and output signals The two logic statesof a serial input or outputarecalleda mark and a space A mark is defined as a TTL logic 1 an EIA minus voltage or 20 milliamperes flowing in the current loop A spaceis ...

Page 69: ...with IC607Aand IC608A divides the 1200baud rate clock by 11 to generate the 110baud rateclock Oneof thebaudrate clocks 600 9600 can be jumper connectedto the pteset baud out from the I O circuit board This output and the 300baudrateoutput areconnectedto Baudrateswitch SW2 on thebackpanelof the Ter minal This switch selectseither 300 baud or the presetbaud rate IC607B IC607C and ICGO7D in conjuncti...

Page 70: ...rovidesaprog bersand their respectivePart Numbers The compo ram for eachof the four specially programmed in nent numbersarelisted in numerical order The sec tegratedcircuits COMPONENTNUMBER INDEX This index shows the Part number of each semi conductor in the Terminal DIODES ctRcurr COMPONENT NUMBER HEATH PART NUMBER D1 D2 D101 D104 D105 D109 D11t D1 t2 D301 D302 D303 D304 D305 D307 D401 D404 56 56...

Page 71: ...8 443 755 443 81 3 443 46 443 t2 442 620 443 838 443 767 443 754 443 8t 1 443 779 443 728 tc101 1c102 rc103 tc104 rc105 1c201 tc202 1c203 tc204 tc205 tc206 tc207 1c208 tc209 tc210 1c211 1c212 tc213 tc214 1c215 1c216 1c217 tc218 tc219 tc220 tc221 1c222 1c301 1c401 tc402 tc403 tc404 1c405 te06 tc407 1c408 443 741 443 817 443 7 t9 443 728 443 745 443 5 443 764 443 719 443 4 443 800 443 745 443 779 44...

Page 72: ...752 443 779 443 730 443 797 443 791 443 752 443 807 443 779 4 3 780 443 787 443 728 443 730 443 779 443 730 443 797 443 779 443 730 443 780 443 728 CIRCUIT COMPONENT NUMBER HEATH PART NUMBER tc712 tc713 1c714 tc715 tc716 1c717 tc718 tc719 1c720 1c721 1c722 1c723 1c724 tc725 tc726 tc727 1c728 1c729 tc730 1c731 tc732 tc733 1c734 tc735 tc736 tc737 tc738 1c739 rc741 1c742 443 807 443 800 443 780 443 8...

Page 73: ...NUMBER INDEX This index shows a load configuration detail basing diagram of each semiconductor Part Number DIODES NOTE HEATH PART NUMBERS ARE STAMPED ON MOST DIODES OR 4 OR aF OR OR OR 1f SI HOTCARRIER 10mA 5V ...

Page 74: ...Page 72 TRANSISTORS HEATH PARTNUMBER f c 4 s44 NE B fi g 4 417 874 417 875 417 235 417 818 417 819 417 881 ...

Page 75: ...UITS 0ul s VOLT REGULATOR OUT 2O VOLT REGULATOR 442 609 COMMON INPUT CONTROL TOP V ITW OUTPUT GND SYNC IN SAWTOOTH DUTY CYCtE R C PHASE DET OUI I I tt 8 L 2 I 7 I 3 I 6 J 4 I 5 PHASE LOCKED LOOPOSCILLATOR 4 12 VOLT REGULATOR ...

Page 76: ...lntegrated Circuits cont d QUADRUPLE 2 INPUT POSITIVENANDGATE AND GATED J KMASTER SLAVE FLIP FLOP WITHPRESET ANDCLEAR PRESET CLOCK DUALJ K FLIP FLOP WITH CLEAR TRIPLE3 INPUT POSITIVE NAND GATE ...

Page 77: ...ND 443 26 74S00 QUADRUPLE 2 INPUT POSITIVE NAND GATE IA IB 443 46 7402 QUADRUPLE 2 INPUT POSITIVE NOR GATE 443 612 74193 SYNCHRONOUS UP DOWN DUALCLOCKCOUNTER BINARYWITHCLEAR INPUIS INPUTS ji ft kA ouTpuTs fo AD j fiATi f 9AIA ULEAtr vcce66il6iliFfrI cD DATA 0n 0a C0UN1COU I 0c On Gl D B rJ DOWN UP ar INPUT INPUTS vJ INPUTS OUTPUTS CTEAR BORROW CARRYLOAD COUNT COUNT oA DowN uP o6 ...

Page 78: ...IVE NOR GATEWITHOPEN COLLECTOR OUTPUTS OUADRUPLE 2 INPUT POSITIVE NAND GATE 2 GND 443 730 74L574 DUALD TYPE POSITIVE EDGE TRIGGERED FLIP FLOP WITHPRESET ANDCLEAR 2 VCC CLR 2D zCK 2PR 2Q ZO I ID ICK IPR IQ IQ GNO CLR 8 INPUT POSITIVE NAND GATE cc Nc ...

Page 79: ...BINARY COUNTER V66 R6121R C R912y INPUT INPUlT r r r B A QA QD 443 745 741503 OUADRUPLE2 INPUT POSITIVE NAND GATE WITHOPEN COLLECTOR OUTPUT OUAD TYPE FLIP FLOP COMPLEMENTARY OUTPUTS COMMON DIRECT CLEAR CLEAR IQ Io ID 20 2Q 2G GNO 74LS175 74L5240 OCTALBUFFERS LINE DRIVERS LINERECEIVERS INVERTED3 STATEOUTPUTS ...

Page 80: ...5 TMS6O1 1N 1M6402 UNIVERSAL ASYNCHRONOUS RECEIVER TRANSMITTER RDA DA S R NC NO INTERNAL CONNICTION llt40 239 l 38 4 l 5 tt 6 j5 ll 2 19 22 20 z 1 4 8 1 1 tl 10 3i ll 30 12 29 t3 28 l4 27 r t 6 16 25 17 24 4K 1024x4 STATICRAM Al A2 d3 GND U02 103 04 WE ...

Page 81: ...Y8 Y7 Y6 Y5 Y4 Y3 2 YI Yl0 SHIFT DATA SIROEE OUTPUT DATASTROBE CONTROL OUTPUT EMBTE REPTAT KIY BOUNCE i lASK vcc CONTROL SHIFT LOCK I O I 2 3 4 5 6 7 8 9 IO II T2 QUADRUPLE 2 INPUT POSITIVE NOR GATE 4 3 780 QUADRUPLE 2 INPUT POSITIVE AND GATE vcc 48 4 BIT BISTABLELATCH EMBLT ...

Page 82: ...2 II 08 o1 I ooro JINPUTS DATA INPUTS A I1 GN 03 02 0l l t24 223 322 421 20 6 t9 7 18 8 It 9 16 l0 15 I I ra 12 ll 74L5244 OCTALBUFFERSILINE DRIVERS LINERECEIVERS NONINVERTED 3 STATE OUTPUTS 2YI GND TRIPLE S INPUT POSITIVE NAND GATE vcc lc ly 741520 DUAL 4 INPUT POSITIVE NAND GATE ...

Page 83: ... d vcc lc lv 3c 38 3A 3Y 2 GND TRIPLE3 INPUT POSITIVE NOR GATE INPUi5 0 I 2 3 4 5 6 GND OUTPUTS 0 2 3 4 5 6 7 8 9 ANODF CATHODF NC BASE COtL CTOR FMIITIR PHOTOTRANSISTOR OPTO COUPLER QUADRUPLE BUSBUFFER GATE WITH THREE STATE OUTPUTS ...

Page 84: ... NC A9 A8 A7 NC rlt24 2zt 322 421 6 tg t tt 8 ti 9 to Io l5 I I 14 12 13 0rlrR0 2 BD RqlllRqr2 N INPUT VCC Rqll Rcir2 443 814 4 BITSHIFTREGISTER oJ IPtrIs clocK c o KItsHtfl QC QD R SHIFT LOAD SERIAL A B C D t40DE INPIJT _F_ CoNTROL INPUTS QA QB OC QD CKICK SER IALINPIJT A B C D MODE ...

Page 85: ...US UP DOWN DUALCLOCK COUNTER BINARY WITHCLEAR 443 81 5 vcc 48 4A 4Y 38 3A 3Y 2Y CND QUADRUPLE 2 INPUT POSITIVE AND GATE WITHOPEN COLLECTOR OUTPUTS 443 816 SYNCHRONOUS UP DOWN DUALCLOCK COUNTER BCDWITHCLEAR INPUTS INPUTS r oJTp jTs fo D D ftA_i i d UAIA LLLAX vcc r 66iF6fr dTril c D DAIA 0e 0a C0UNTCOUNI 0f 06 6N0 B rJ 00WN Up s v INPUI INPUIS _J INPUIS OUTPUTS coTNTcOUNT 0A DOWN UP 443 817 ...

Page 86: ...ated Circuits cont d HEXINVERTER WITHOPEN COLLECTOR OUTPUTS 4 BITBINARYCOUNTER INPUTR0il RO 2 NC VCC NC NC 444 10 444 11 444 12 256 BtT READ ONLY MEMORIES T AD D AD C AD B AD A DOl DO8 002 D03 D04 D05 D06 DO7 ...

Page 87: ...0 0 0 0 L 0 0 n r o o 0 0 0 7 0 0 L 0 D o 0 T 0 0 0 0 0 0 0 o 0 t 0 7 0 0 u o o 0 o r T 0 o o o 0 0 0 0 1 0 0 0 0 0 o o 0 B o I I u 0 0 7 0 0 L 0 L 1_ 0 0 0 L o L 0 0 t L 0 0 0 I 0 1 1 0 L 1 o o o I L 0 0 0 L 0 0 0 0 I L 0 t 0 I 0 0 o 0 L 1 L 0 0 1 0 0 D 0 L L 1 7 o I o o 0 I 0 o 0 u L 0 0 0 L L 0 0 0 7 I 0 n 0 0 L o 0 L 0 4 o 0 7 1 1 o 0 7 t L 0 0 7 0 7 0 7 0 0 L L 0 0 1 L 0 t 0 L L 0 0 0 L o I t...

Page 88: ... 0 0 1 0 0 0 0 7 I 0 I u 0 0 7 0 0 I 0 7 7 0 I 0 u 7 0 7 0 7 0 0 1 1 0 0 0 1 L 0 7 o 4 T o 7 I 0 o o I 0 t 7 0 0 0 t I 0 I 0 0 0 u 1 T B L 7 u T 0 I 0 0 0 T I T 0 0 L I 0 I t 0 0 0 T 7 I t 7 0 t 0 L L D 0 I 0 o o 0 0 o I 0 I n 0 I n 0 0 7 0 0 I 0 I 0 0 I 7 o t 0 0 U I 0 0 0 0 I 7 0 0 7 I 0 0 L 0 0 0 0 1 0 7 o 0 o o T 0 I 0 0 0 7 0 t 0 1 7 0 7 0 T D 0 7 0 I 7 0 0 0 I 0 I 0 0 B 7 0 I I L L 0 1 0 7 0...

Page 89: ... 7 T 0 0 0 1 L I 0 I L 0 0 0 0 0 0 0 L 0 0 0 I r r 0 1 T 0 0 0 L 0 o 7 0 0 0 t 0 o o o 0 L L 0 o o n n o n n n n n n n n n n o I 0 L n o o o o o o o n n n 0 n o n L 1 1 0 0 O I 1 n n o 0 0 o D o o L o n o o 0 7 0 0 0 0 I 0 0 1 7 I 0 7 L 0 0 o t o o 0 7 7 o I L u 0 o n 0 u T 0 0 n n n n n n t 0 L 0 0 n n 0 0 L I 0 a 0 0 o o o n n n n n n n n n n n n n 7 L o o 0 o 0 0 L L 0 0 t L 0 0 0 7 I 0 7 I 7 u...

Page 90: ...indi cated outputs z z J Fl t 7 FF T Ti c I F c E XP t E CR FF CR E E I I DAVu t T Tl DAVp k E E I DAV OB N ADDRESS T T i i R 1 T 1 I N I trPLUX c 1 T 1 N I X BI P E E x x xP l I z l a J fr l x ll r o XBL T T ia I I T E a iC R c o Re select RAM t l CI Ro q o OBTXP I OAD T E r I OAI PARA I I t a I OAI I ART z d J t C t d C 1 U ...

Page 91: ...TICULARPIN NUMBER FOREXAMPLEI P604 II MEANSPLUGP604 PI N II 5 TNDTCATES A FEMALE C0NNECTOR ptN THENUMBER FOLIOW I NG THECONNECTOR NUMBERI NDI CATESTHE PARTICULARPIN NUMBER 6 ALL RESI STORSARE I 2 WATT IO UNLESSTHEYARE MARKEDOTHERW I SE 7 ALL RESISTORS VALUESARE IN OHMS K IOOO M I OOO OOO 8 ALL CAPACITORVALUESLARGER THANI ARE IN pF UNLESS OTHTRWISF INDICATED CAPACITOR VALUESLESSTHAN I ARE lN uF 9 R...

Page 92: ......

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Page 94: ...2 ATTN PARTSREPLACEMENT Phone Replacement partsonly 616982 3571 U z J o U F F o z a F l o THIS FORMIS FOR U S CUSTOMERS ONLY OVERSEASCUSTOMERS SEE YOUR OISTRIBUTOR DO NOTWRITEIN THISSPACE Theinformation requested inthenexttwolinesis notrequired whenpurchasing nonwarranty replacement pans but it can helpus provideyouwithbetterproducts in the future SEND TO HEATH COMPANY BENTONHARBOR MTcHtGAN 49022 ...

Page 95: ...procedures voltagereadings and any otherinfor mationyou think mightbe helPful Pleasedo not send parts for testing unlessthis is specifi cally requesledby our Consultants Hints Telephonetrafficis lightestat midweek pleasebe sure your Manualand notesare on handwhen you call HeathkitElectronic Centerfacilitiesarealsoavailable fortele phoneor walk in personalassistance REPAIRSERVICE Servicefacilitiesa...

Page 96: ... t I _ H E AT H C O M PA N Y THE WORLD S FINEST MICHIGAI KIT FORM LITHO IN U S A ...