televideo 920 service manual
Contents
1. ero dav ERA ERE A 6 6 47 5 1 cia ated A eee ah aa ates Ba eed ee 6 6 4 1 Conversation Mod sete ea dele eee he ed eed ped eed x 6 6 4 2 Block Mode utor re E iMm 6 6 5 Protect Mode sve mU Lupe RT EA Rau RP Gow Spe 6 6 0 The Cursor 25565 LAGER Vs Wd EM RO RS Re RR X Se 7 6 7 Editing FUnNGHONS oae e xa peg aa date ud d DM eT ay 7 6 8 Formatting Capabilities 7 Operation of 1 912 920 7 7 1 Keyboard 010001005 c oce I SE 7 7 1 1 Control Keys Functional 1 9 7 2 Function NCS osea e oo cw Sem ed dece aea Up 12 7 3 Numeric Key Pad we ENCORE Pu EDDA acp E 13 7 4 ON OFF Switclicun aee ERU Ret m eo A SO Lec te rq e es CE 13 75 912 920 5 13 7 6 0016600066 iia Be eta aoe a a ad ae se 12. ESC oad Cursor di Cea ESC Read Cursor e EI RR oe oe hate ESC Set Block Mode ESC B Set Conversation Mode ESC C PrintPade 2 Dd Gh A ESC P Char Insert oia ke pes ESC Q Char Delete d uc mue da Pe ESC W Larie Insert zc Sd e Ee BES ESC E Line Delete res x sre ro ge a Ae ae ESC R Line Erase to ESC T Page Erase to 5 ESC Y B ck T b a E tl ae eds ESC I Toggle Page Rd S ESC K Start Blink Field a Ao ESC Start Blank Field ESC _ underscore End BlinK Blank dul ESC E WA hsv eh ae ESC i Start Inverse c Ed aa San ees d m A ESC j End Inverse 5s va sob ebrei uud nel ds ESC k Start Underline uvis pu C emu ESC End Underline be m WE WAS ESC m Line 5 10 5 5 52 55 a Eos ERA er RE ESC t Page Erase to ESC y Auto e do Us b REY S ESC v Auto Fip Of suo pd t a ERU dua ESC w Extension Port
3. ed MI ae We hemos AA 3 Interfaces heh ino edd Sud dye AS Se aat E dex 3 3 12 Rates zc X ANC eire sr tt WU eren 3 A pairs UE ox End aiiud A m s 3 214 Weight c a UE p ere rl a D ER SS 3 3 15 Operating Environment uo a ne RR ERROR CR A 3 3 16 Power Requifements 24325 x Ir ncaa cae ne ane GU TRU Ae D Eo 3 interconnection 226 a a a aa aves ere emt e 4 41 Intereonnections Steps veo RR st ave P Wa adv OP AN 4 4 2 Main Interface 4 4 35 Printer Interface ou sre Ibex bank 4 Installation sar oe Wate pe ue qu Sra 5 Local Installation ia crac e AAA PLO ee RE Wa AS 5 52 Remote Installation RU ea EON PE Ie In Y Xo 5 5 3 Terminal TURN ON Procedure 5 Functional Description 912 920 6 61 Keyboard ios Roe Ry uei xus 6 6 2 Contrast Control zado ene e De a HR dee 6 6 2
4. A 3 2 1 0 BIT 7 6 5 B3 B2 0 0 BLANK 1 0 1 NOT ALLOWED 1 0 NORMAL VIDEO 1 1 BLINK B1 START REVERSING VIDEO BO START UNDERLINE If Bit 4 is set then B3 B2 indicate the start of a new intensity field otherwise B3 and B2 have no effect Bits O 1 indicate the start or end of reversing or underline field 1 START O END 7 7 Block Mode Conversation Mode Message Transmission Send Line Unprotected ESC 4 or SEND LINE Cursor moves to the first character position of the line All following unprotected characters ex cept NULLS up through the previous cursor position are transmitted followed by a RETURN code Each protected field is indicated by an FS code Send Line All ESC 6 or SHIFT SEND LINE Cursor moves to the first character position of the line All following characters except NULLS protected or unprotected up through to the previous cursor position are transmitted followed by a RETURN code Protected fields are bracketed by ESC and ESC sequences Send Page Unprotected ESC 5 or SEND PAGE Cursor moves to home position All unprotected characters on the display except NULLS through the previous cursor position are transmitted followed by a RETURN code Protected fields are indicated by an FS code The last character on a line is followed by a US code Send Page All ESC 7 or SHIFT SEND PAGE Cursor moves to home position All characters except NULLS up through the previ
5. TeleVideo Inc OPERATORS REFERENCE HANDBOOK TVI9 912B and 920 TVI9 912C and TVI 920C Copyright Televideo Inc 1979 1979 TeleVideo Inc Specifications and information subject to change without prior notification 1 0 2 0 3 0 4 0 5 0 6 0 7 0 General Features o gato ae Rr ORES Se Se dba Ps OE Ee 1 1 1 Options co he 1 General Description HR 2 Specifications xol EL a eed oa Oe OG ib 2 31 MONITOR 2 556 AA are eta pee AA P UR ed NI eg 2 3 2 Displayed Character 061 iussis gu aco o Bw Se Wb eed da 2 3 3 Character Font iba iL Solan sh 2 3 4 Keyboard Format sn s NUR IRR eaa ee Be ey 2 Editing Features sce peel RN EP ep eta or A Sw e re SUE AERA 2 3 67 Cursor Controls ls den ang E S peg qe a a 2 3 7 Formatting Features er Pee a REA ee qo be ee ERU 3 3 8 CI ATL LPSET 3 3 9 Repeat ETT ueber mex tren aae OR tod alter c AC Re ER e LR 3 3 0 Transmissloti Ree Roe dos
6. 6 6 The Cursor 6 7 6 8 7 0 7 1 The cursor of 1 912 1 920 is a reverse video block rectangular shaped marker on the screen which indicates the entry spot for the following character to be typed When typing the cursor moves from left to right If the cursor is placed over a character already displayed the character is changed into a reverse image inside the cursor The cursor can be moved up down left right or home by pressing a cursor motion key Any desired cursor position can be obtained using an absolute cursor address of Y line and X column combination Editing Functions Clear screen to spaces or nulls Character typeover Clear unprotected positions Character insert and character delete Line insert and line delete Erase to end of line or field with spaces or nulls Erase to end of page with spaces or nulls Formatting Capabilities Tabs When in protect mode the tabs forward and back are set using columns of protected characters The TVI 912 TVI 920 also offers typewriter style tab when not in Protect mode Up to 80 tab positions may be set without loss of character location Field Reverse data be displayed as black characters a white background Field Blinking Blinking fields can be designated over areas of the display and the designated areas blink on and off at a 2 Hertz rate Field Blanking Blank fields can be designated over areas of the display The areas are blanke
7. RETURN CTRL M ENTER SHIFT ALPHA LOCK 912B 920B ALL 920 ALL 920 ALL 920 ALL 920 ALL 912B 920B ALL ALL ALL ALL ALL 912C 920C ALL ALL If in Protect Mode writes vertical column of protected spaces in the column containing the cursor Column begins in row containing the cursor and extends through bottom row If not in Protect Mode a typewriter TAB is set Will not change any protected characters ESC 4 or SEND LINE key causes unprotected characters in the displayed line containing the cursor to be transmitted if in Protect Mode ESC 6 key causes all characters in the displayed line con taining the cursor to be transmitted All characters are trans mitted beginning at the start of the unprotected field or the start of the line up to the position the cursor was in when SEND LINE was requested ESC 5 or SEND PAGE key causes unprotected characters of the displayed page to be transmitted ESC 7 causes all characters in the displayed page to be transmitted All characters are transmitted from the begin ning of the first unprotected field or page up to the cursor position when SEND PAGE was requested Enables output to the hard copy printer which is optional PRINT key pressed causes each line to be transmitted to the printer followed by a CR LF NUL sequence from the be ginning of the page to the cursor position The last character will
8. Connect a jumper between P3 2 and P3 3 Momentarily short the two pins next to the connector on the keyboard The display test pattern will be generated Note that the display will update only after 100 characters have been transmitted this may be a significant delay at slower BAUD rates After all test patterns have been displayed the BELL will sound Verify the test pattern as shown TVI 912 TV 1 920 Test Pattern ni amp 0123456789 lt gt 7 ABCDEF GHI JKLMNOPQRSTUVNXYZ _ abcdefghi 42 and LO 019834567891 7 RESI ABCDEFGH JKLMNOPQRSTUVWXYZ t_ abcdef gh gt BABCIEFGHI JKLMNOPQRSTUVWXYZ0 Jt_ abcdefghi Jb ABCDEF GH JKLMNOPQRSTUVWXYZ t_ abcdefoh 8 0 PROGRAMMING THE REMOTE COMPUTER 912 920 can be fully controlled by the remote computer The remote computer can execute all the control functions that are performed from the keyboard The computer controls the 1 912 1 920 by transferring the appropriate ASCII codes over RS232 or current loop interface 8 1 CTRL Functions When executing a control function at the remote computer the following rule applies comple ment bit 7 of the code for the character which is typed while pressing the CTRL key This gen erates the same code produced by striking the character key while pressing the CTRL key 8 2 ESC Functions To execute an escape sequence function from the remote computer transmit the ASC
9. Dual intensity Blinking fields Secure fields non display Inverse video Underlined fields Character Font 7 x 10 dot matrix with 12 x 10 resolution Key Board Format Editing Features Clear screen to space or null Typeover Character insert and character delete Line insert and delete Absolute cursor addressing Erase to end of page Erase to end of line or field Line edit Cursor Controls gt lt 1 New line Home Tab Back Tab j 3 7 Formatting Features Tab Back tab Column tab set Blinking field Inverse video Underline Dual intensity Protected field 3 8 Parity Even Odd Mark Space or No Parity 3 9 Repeat 15 cps auto repeat 3 10 Transmission Conversation mode Full or half duplex Block mode Formatted information transmitted by line or page protected and unpro tected or unprotected only 3 11 Interfaces Standard 5232 point to point 20ma current loop RS232 to printer port 3 12 Data Rates 9 speeds 75 110 150 300 600 1200 2400 4800 9600 3 13 Dimension Height 13 1 4 33 66 Width 16 1 8 40 96 Depth 20 1 16 50 96 cm 3 14 Weight 30 Ibs 13 95 kg 3 15 Operating Environment Ambient temperature range non condensing O C to 50 C 32 F to 122 F Maximum relative humidity 95 3 16 Power Requirements 115 230 VAC 50 60 Hz 55W 4 0 INTERCONNECTION 4 1 Interconnec
10. 0 44 71 1 45 L 72 g 2 46 M 73 h 3 47 N 74 i 4 48 75 1 49 76 6 50 0 77 7 1 8 78 8 52 5 79 n 9 53 T 80 0 54 U CURRENT PAGE Transmit ESC YX Y 1 24 X 1 80 Protect Mode On Protect Mode Off Write Protect Off Write ProtectOn Clear All to Nulls Clear All 10 5 Set Tab Clear Tab Clear All Tabs 4 Send Line Unprotected al Send Page Unprotected Send Line All 7 Send Page All Clear FG to Nulls Clear FG to Spaces i Load Cursor Read Cursor e gt F G Extention Print Mode Page Print Mode Set Block Mode Set Conv Mode Line Insert Back Tab Toggle Page P Print Page Char Insert Line Delete T Line erase to spaces W Char Delete A Start Blink Start Blank 29 Y Page Erase i to Spaces 2 ESCAPE SEQUENCES Keyboard 2 Unlock Keyboard 3 Lock 1 Tab j Start Reverse Video k End Reverse Video Start Underline m 2 a m Underline 111 7 q End Blink Blank t Line Erase to Nulls Auto Flip On w Auto Flip Off y Page Erase Nulls DEL gt 1 912 920 5 gt Sou je adu OPERATOR S QUICK
11. as Mark parity 8 8 Not used 9 Un Parity Select EVEN Down ODD 10 Steady Cursor Down Blinking Cursor 12 2 S5 UART Terminal Options 1 Open P3 6 Not connected Closed Data set ready DSR received on P3 6 2 Open P3 8 Not connected Closed Data Carrier Detect DCD received on P3 8 3 4 55 3 55 4 Open P3 20 Not connected Open Closed Data Terminal Ready is on when the terminal is Closed Open Data Terminal Ready is connected to Request to Send RTS Closed Closed Not allowed 5 Not used 6 7 55 6 55 7 Not allowed Open Closed 20 ma current loop input Closed Open 5232 input Closed Closed Not allowed 23 OPERATOR CONTROLS Main Port Transmission Baud Rate Options Contrast gt ON OFF Switch Printer Port Main Port n Po 115 220 volt switch 24 HALF DUPLEX PASSIVE Install Jumpers at W 6 W 14 amp 6 FULL DUPLEX PASSIVE JUMPER OPTIONS HALF DUPLEX ACTIVE Current Loop v 912 920 Install Resistor Computer pH 2 5 4 4 o wey A Y A SY lt OY Y B REVD amp E REV FULL DUPLEX ACTIVE XMTR Install 12V Jumpers at W 15 8 W 17 Install Resistor at R 28 Jumper W 13 Terminal 4 8 Ready to Printer 7 12 Terminal P4 6 Ready to Printer 20 Source 20 mA Source W31 Installation of this jumper will enable an automatic l
12. cursor and the end of the line this operation terminates at the end of the line and the last character in the line is lost If a protected field is encountered and Protect Mode is on the operation will terminate at the end of the unprotected field at which the cursor rests and the last character in that field is lost Deletes character in cursor position If no part of the line is protected characters following the cursor are moved to the left If the line has a protected field only the characters from the cursor to the protected field are moved to the left This operation terminates at the end of the line if no protected fields are on the line Inserts a line of nulls between the line above the cursor and the line where the cursor is positioned At this time the line where the cursor was located and all following lines move one line downwards The cursor is positioned at the start of the new line The bottom line of the screen is lost If in Protect mode no operation is performed Deletes completely the line where the cursor is located All following lines move one line upwards Cursor is positioned at the start of the line If in Protect mode no operation is performed Erases all character positions from cursor to the end of the line where the cursor is located and replaces with Space Codes ESC T or Null Codes ESC t if shifted TVI 920 only If in protected mode the operation will end at the first protected location to the
13. of viewing more than 1 set of 24 lines x 80 characters Operation of this second page is described below 11 2 Alternate Page To view an alternate page of data the memory may be swapped by issuance of ESC K from either the keyboard or incoming from the modem port P 3 When this is performed the data currently displayed will be transferred into memory and re placed with all data stored in the alternate page If no data has been previously stored in the alter nate page the screen will be blank with the exception of the cursor The cursor will rest in the same location on the alternate page as it was on the previous page when the action was initiated If the position the cursor is to rest in on the new page 15 protected the cursor will automatically jump to the next unprotected position available If there are no unprotected positions available the cursor will go to the home position and rest there as described in Section 7 1 1 Only one page may be viewed or acted upon at any one time 11 3 Auto Flip ESC v ON ESC w OFF Auto Flip when turned on with an ESC v puts the 1 912 1 920 is a mode whereby when a downward vertical motion is attempted by the cursor from the last enterable line on the current page the Alternate Page will automatically be displayed automatic Page and any will be entered on the new page A clear unprotected to spaces will be performed and the cursor will rest in the first unp
14. printer to make a permanent copy of data displayed on the screen This interface can be used with most RS 232 compatible serial printers currently available in the market including both character by character and buffered printers The interface buffers the data input from the computer to make it available for editing and additions from the terminal prior to printing This interface also permits the printer to be operated at a different baud rate from the computer input rate 10 1 Interface Connector The printer interface is a 25 pin connector J3 located on the rear of the control board accessible from the rear of terminal The J3 signal pin is described as follows Frame Ground Serial DATA RS232 Printer Ready Option Select Terminal Ready Option Select Signal Ground Terminal Ready Option Select Printer Ready 10 2 Transmission Rate The transmission of information to the printer can be at any one of the rates available for TVI 912 TVI 920 to computer communication 10 3 Print Modes Page Format Mode This mode selected by ESC A allows the printer to print data exactly as displayed on the screen A page format transmission is actuated by pressing the PRINT key at the desired print operation stopping place The cursor then moves to home position a CR LF NULL is transmitted followed by the data on the screen Upon transmitting the last character on each line the terminal sends CR LF NULL sequence before moving to
15. the next line When the cursor reaches the previous cursor position stored when the print was initiated the operation is terminated and final CR LF NULL is transmitted The character under the cursor is sent Page Format print operations may be controlled in any one of two ways 1 Internal No Delay Data flow is continuous without any delay between characters or lines 2 External Printer Ready The TVI 912 TV1 920 monitors the state of the Printer Ready line J3 pin 20 or pin 4 to determine availability of the printer to accept data Data is trans mitted continuously as long as the printer is ready This method is normally used with buf fered printers which accept a full line of data before printing Protected Mode all data displayed in reduced intensity will be transferred to the Printer as spaces thereby allowing the use of pre printed forms In Print Mode Nulls will be sent as spaces to facilitate forms entry operation Extention Print Mode This mode selected by ESC will enable data received at the modem port P3 to be output on pin 3 of P4 While in this mode receipt of a print command will interrupt the data from P3 and print the page then reconnect the data from P3 to P4 20 11 0 SECOND PAGE MEMORY OPTION 11 1 This option allows access to one additional 1920 character memory space for usage identical to the Standard Page With this option installed the user has the capacity
16. 3 7 7 Block Mode Message Transmission 15 7 8 Conversation Mode Transmission 15 79 Self Tes A A ds PES AAA gd ea vM as 16 7 9 1 TVI 912 TVI 920 Test 16 TABLE OF CONTENTS TABLE OF CONTENTS cont t Programming for Remote Computers 17 1 CTRL Functions aha A EHE Haein x 17 8 2 ESC hes eel ow Ble bI Sea Rio 17 8 3 Additional Remote 5 17 Word Structure 222220 Leelee a so decanus We Sd nte 18 Serial Printer Interface 19 10 1 Interface Connector so ae a EG Ru Re IEEE eR aN 19 10 2 Transmission Rate i suede Sane hea ete ug 19 10 3 Print Modes anit eS SER aor eese as e Fus OW ers 19 Second Page Memory Option 21 TT T DescriptiOR 21 11 2 Alternate 0806 2 bateau a Aun 21 Auto Flip Re S Sp RC HE DRIN e ins 21 Option Switch Selection 2 i e
17. C outlet Set the ON OFF switch to ON position the beep will sound Cursor will appear at its home position in approximately 20 seconds If the cursor does not appear at the home position press HOME key If the cursor still does not appear check if the brightness control is properly adjusted 6 0 6 1 6 2 6 3 6 4 6 5 FUNCTIONAL DESCRIPTION 1 912 1 920 Keyboard The 11 912 has 84 key keyboard comprised of alphanumeric characters symbols and control keys to perform its full operation The TV1 920B has a 103 key keyboard which adds 11 special function keys six editing keys and two transmission keys The 1 912 has a 82 key keyboard in a standard typewriter style with alphanumeric characters symbols and control keys The TVI 920C has 101 key keyboard a standard typewriter style that adds 11 special func tion keys six editing keys and two transmission keys Contrast Control The brightness of displayed data on the screen can be adjusted by means of a control knob on the rear of the TVI 912 TV I 920 Transmission Rates The TVI 912 TVI 920 meets the standard transmission rates of computer interfaces telephone data lines and modems with 9 speeds 75 110 150 300 600 1200 2400 4800 9600 baud Speed is selected by means of switches on the rear of the terminal Mode Selection The TVI 912B TV I 920B selects Block Mode with CTRL ESC The TVI 912C TV I 920C s
18. II ESC code followed by the character code 8 3 Additional Remote Functions In addition to the keyboard controls described in previous pages the remote computer can per form the following functions ESC st Disable Keyboard Disables all keyboard functions Remote function only ESC Enable Keyboard Restores keyboard control Remote function only ESC LOAD CURSOR The next two characters following the ESC represent the CURRENT PAGE absolute line and column Y and X coordinates which are used to position the cursor For character representation of the co ordinate values refer to the Operator s Quick Reference in the last page of this manual ESC Read Cursor Causes the line and column Y and X coordinates of the cursor followed by a CR code expressed as three ASCII characters to be transmitted to the remote terminal The same codes are used for control of the 1 912 1 920 either from the keyboard or by the remote computer with the exception of ESC ESC WORD STRUCTURE 912 920 uses USASCII This is 7 level code but the TVI 912 TVI 920 carries 8 bits in memory for each character position on the screen that is 7 bits to identify the character and the 8th bit to identify if it is protected Asynchronous transmission means each character is transmitted as a single self contained message with a start bit stop bits and a possible parity bit When the start bit is recei
19. On ESC Page Print On ESC A 31 3o 5234 571 TELEVIDEO INCORPORATED 3190 Coronado Drive Santa Clara California 95051 408 246 5428 TWX 910 3387633
20. REFERENCE 912 920 CONTROL Function Sequence 25 3 04 Sted ate Dew edite mius CTRL cic oru wei exer CTRL H Cursor cond EI E e bu cee CTRL J C rsor Tu eds eo ae CTRL K Edo aa aos rea eux eben L HOME ru os trcs CTRL Tab skip ru nien buena enge EI eee dC CTRL I New Line zas CTRL underscore Protect Mode caue onu nt DOW PW Rs ESC amp Protect Mode Off ESC Start Half ESC End Half Intensity ESC Set Column Tab 5 ia E ee Ed ESC 1 Clear Tab a Rv Aa Ce e Na eee ESC 2 Clear All Tabo dique dee ep a 074480 ESC 3 Send Line ESC 4 Send Page ESC 5 Send Eine All 3 A RSE EU LEER ESC 6 Send 0306 2 o Co Ae ae ESC 7 Clear All to ESC ESC Z Clear All to ESC Clear FG ee ESC Clear FG to CTRL Z ESC Keyboard Enable Esc Keyboard Disable
21. already exist in the char acter locations beyond which the cursor rests all the attributes desired must be started at that point EXAMPLE A Assume a full screen of Reverse Video You wish to have the bottom half of the screen Underlined and Reverse Video Position the cursor at line 11 column 80 Issue to the TVI 912 TVI 920 ESC j then backspace to the same position and issue ESC The bottom half of the screen only is now Reverse Video Underlined 13 To eliminate any single attribute that exists with others the attributes that are to remain must be set again and then the undesirable attribute turned off with the appropriate ESC Sequence EXAMPLE B Assume a full screen of only Reverse Video You want to display a Page Heading of Underline Reverse Video in the center of the second line Position the cursor one space before where the new attribute is to be set Issue ESC j Start Reverse Video then backspace to the same position and issue ESC The screen will now be Reverse Video Underline from that point to the bottom of the page Now position the cursor one space past the desired end of the Reverse Video Underlined Field and issue ESC j backspace and issue ESC m The screen will now be Reverse Video with an underline Reverse Video Field on the second line To display more than one Visual attribute over the same area position the cursor one space prior to the location at which the attributes are to be displayed and issue t
22. be followed by CR LF NUL If in Protect Mode the protected half intensity character will be replaced by spaces used with pre printed forms This key moves cursor to the next lower line If new position is protected cursor skips forward to the first unprotected position Moves cursor to the first character position in the line which it rests or to the first unprotected position of the line if in PROTECT MODE Selects upper character indicated on another key This key is also used to change operation of special keys Locks upper case for alpha characters only Does not affect numeric or special keys 11 SPACE BAR Causes a blank space to appear on the display It also causes ASCII space code 20H to be transmitted in Conversation Mode ESC ALL ESC sets Write Protect half intensity for each character typed thereafter until reset ESC ALL WRITE PROT half intensity is turned off by ESC PROT MODE 912 920B Protected characters set with Write Protect are shown in lower ESC ALL intensity but protection is not effective The characters written with Write Protect on will be treated the same as all other characters by all editing functions SHIFT PROT 912B 9208 Protect Mode 18 set and half intensity characters are protected MODE from over writing or erasure In Protect Mode the cursor can ESC amp ALL not sta
23. d although the characters are still entered into display memory Field Protection Protected fields can also be designated The protected fields appear at a reduc ed instensity and once designated as protected fields cannot be over written unless the TVI 912 TVI 920 is removed from Protect mode OPERATION OF TVI 912 TVI 920 Keyboard Function 912 TVI 920 keyboard contains alphanumeric keys to enter data and function keys control keys for controlling operation For all the definitions of keyboards and control codes please refer to Quick Reference Guide page 31 Control Keys and Functional Description as follows 0 m E 9 M _ 1 t 1 2 3 4 5 6 7 8 9 0 A gt 1 TVI 912C Keyboard 8 CLEAR RETURN 7 1 1 Control Keys Functional Description Control Keys TVI 912 CLEAR SP CHAR INSERT ESC Q CHAR DELETE ESC W LINE INSERT ESCE LINE DELETE ESC LINE ERASE ESC T ESC t PAGE ERASE ESC Y ESC CTRL 920 ALL 920 ALL 920 ALL 920 ALL 920 ALL 920 ALL 920 ALL ALL Functional Description Transmits a CTRL Z which when received by the terminal performs a clear unprotected to spaces Moves character in the cursor position and all succeeding characters to the right by one position If no protected field is encountered between the
24. e cursor does not move Transmits CTRL I PROTECT MODE BACK TAB key moves cursor back wards to the first character position of its field cursor is at the first character position of its field it moves to the first character position of the previous field If cursor moves through home it comes to rest at the last unprotected position on the screen In conversation mode no action is taken Does not transmit code Moves cursor to the first character position of the top line of the display If the home position is protected cursor moves to the first unprotected position following if Protect Mode is set Transmits ASCII RS code IEH Moves the cursor to the first character position of the next line 1f that position is protected cursor moves to the first unprotected position Transmits CTRL _ Displays alternate page Cursor does not move Shift Page Newline does not transmit a code This key moves cursor to he next higher line This key moves cursor to the next lower line This key moves cursor to next position to its left gt This key moves cursor to the next position to its right For al of the above keys the cursor will advance forward to the next unprotected position if the character space to be moved to is protected and Protect Mode is on Transmits corresponding control code SEND LINE ESC 4 SHIFT SEND LINE ESC 6 SEND PAGE ESC 5 SHIFT SEND PAGE ESC 7 LINE FEED CTRL J
25. elects Conversation or Block Mode by operation of the Block Conversation key with Control or Shift 6 4 1 Conversation Mode Half Duplex In Half Duplex mode the 1 912 1 920 sends and receives data in only one direction at a time Characters are displayed on the screen and transmitted to the computer at the same time as they are typed from the keyboard 1 912 1 920 receives and displays data simultaneously Full Duplex In Full Duplex 1 912 1 920 sends and receives data in both direc tions simultaneously Characters are transmitted as they are typed but they are not displayed The typed characters are echoed from the computer back to the terminal 6 4 2 Block Mode Block Mode TVI 912 TVI 920 sends and receives data in complete blocks Data up to a full screen can be entered by operator In this mode characters are stored and dis played but not transmitted until a special code sequence 18 received by the terminal or by the depression of a send key on the TVI 920 The edited data can be transmitted partially or completely This mode is utilized for fast transmission of large blocks of data Protect Mode In Protect mode those character positions designated as protected lower intensity cannot be modified The cursor cannot enter a protected field The cursor will be advanced through the protected field to the next unprotected position The cursor may be back spaced across a pro tected field
26. er character key will cause transmission of the following sequence 1 SOH Control A 2 ASCII Alphanumeric code for character key pressed 3 CR carriage return Numeric Key Pad The numeric key pad has keys to write numerals from 0 through 9 comma period ENTER and These keys are affected by SHIFT just as the normal numeric keys ON OFF Switch This ON OFF switch is located on the rear of the terminal This two position Switch controls AC power to the terminal Setting the switch to ON position resets terminal circuits positions cursor at home and clears display memories to unprotected spaces 1 912 1 920 Controls The ON OFF and other manual controls are located on the rear of the terminal Contrast Control Desired character brightness relative to screen background can be selected by this control Conversation Mode Switch Full or Half Duplex Conversation Mode operation can be selected by this switch and it is located inside the terminal accessable from the rear of the terminal Baud Rate Switch This 10 position switch selects transmission rate at one of nine standard speeds from 75 baud to 9600 baud ONLY ONE SWITCH MAY BE DOWN AT A TIME 6 600 2 9600 7 300 4800 8 150 4 2400 9 75 5 1200 10 110 Attribute Codes Setting or Resetting Visual attribute Blink Blank Reverse or Underline always overrides any previous Visual attributes set Therefore to add an attribute to any that
27. he appropriate ESC sequence for the first attribute to be set To set the second attribute positon the cursor over the same loca tion used to set the first attribute or piggyback and issue the next proper ESC sequence Con tinue this until all desired attributes are set All Visual attributes set except Reduced Intensity see page 11 will be displayed from the loca tion at which they were set to the end of the page or until they encounter another attribute set code This will act as a terminator for the above mentioned attribute s To keep attributes from being erased in Protect mode they should be set in Write Protect EXAMPLE C Assume No attribute on screen and cursor in home position Issue Write Protect On code ESC then attribute set code i e ESC for Reverse Video Then reset Write Protect ESC and set Protect mode EXC 8 or Shift Prot on keyboard Now depress Clear Space key The screen should still be in Reverse Video If screen clears at no attributes at all repeat above procedure If Blink or Blank is on with Reverse Video Underline or both and it is to be turned off Reverse Video Underline or both must be reset at the start of the non blinking non blanking field before ESC q is issued When Video attributes are transmitted to the computer via the Send command or to the printer by print commands the following bit map indicates the codes which will be sent o o 62
28. ie Ead pe 27 LIST OF ILLUSTRATIONS 4 2 Main Interface Connector RS232C Connector Pin Signal List 4 4 3 Printer Interface e oc n een atl sits dog iat se S 4 7 6 Example C Bit 5 15 9 0 Structure of Serial Data Word 18 10 1 Interface Connector J3 Signal Pin 19 Jumper Options Half Duplex Active EBEN vu EE SERRE eet SEEN E C meh 25 Half Duplex Passive iia ver hue A ees lp a e qr 25 Full Duplex Passive Lohr Eae EN E e x ee iim 25 Full Duplex Active 25 Addressable Cursor 22455118 PEN EE re quce ebd tesa MENDA 28 Escape us aeg esee eoo der erdt RR CR d 29 TVI 912 TVI 920 ASCII Chart 30 912 920 SERIES VIDEO DISPLAY COMPUTER TERMINAL OPERATOR S MANUAL 1 0 GENERAL FEATURES Standard 96 ASCII Character set displayable 1920 Character display 24 lines 80 characters 9 transmission rates from 75 to 9600 bps 14 key numeric keypad 6 separate cursor control keys e Local or remote control of conversation block mode Single key edit operati
29. ine feed upon receipt of a carriage return from the remote or keyboard W32 Installation of this jumper will enable transmission of EOT at the end of Send otherwise a CR carriage return is sent W33 Installation of this jumper will disable the automatic CR carriage return line feed in Column 80 W34 Installation of this jumper will select Page Print Mode as the initial condition at power up Extension Mode will be selected otherwise 25 CONTROL BOARD SWITCHES 51 MODEM PORT BAUD RATE 53 PRINTER PORT BAUD RATE 1 110 75 150 300 600 1200 2400 4800 9600 55 Current Loop Select RS232 Select Not Used Select DTR Power ON Select DTR RTS P3 20 Select DCD from P3 8 Select DSR from P3 6 P3 52 Down Closed Blinking Up Open Steady Select Odd Parity No Connection Select No Data Bits Select 1 Stop Bit UP 2 Select Send Parity Select 50 Hz Refresh Up 60 Select Half Duplex UP Full Select Standard Characters Always Up Open IN Its ain AAA 26 TERMINAL INTERIOR PHOTO 27 ADDRESSABLE CURSOR CURSOR POSITIONING POSITION ASCII CODE POSITION ASCII CODE POSITION ASCII CODE Transmitted X or Y Transmitted X or Y Transmitted 1 28 55 V 2 29 56 3 30 57 4 31 gt 58 5 32 59 2 6 33 60 E 7 34 61 X 8 35 B 62 d 9 36 C 63 37 D 64 38 E 65 39 66 40 67 41 H 68 6 42 69 43 4 70
30. ons 1 920 only Page field or line edit Blinking fields Blank fields Dual intensity Reverse video e Underline fields Field tab backtab Typewriter tabs e Storable tabs Protect mode Self test mode Cursor addressing amp cursor read e 15 cps repeat Typamatic keyboard Standard RS232 point to point 20 current loop Non glare etched screen 115 230 VAC 50 60 Hz Refresh e Serial printer port 1 1 Options e Second page memory 1920 characters 2 0 GENERAL DESCRIPTION The TeleVideo TVI 912 TV 1 920 terminals are compact smart terminals They are the result of state of the art design improvements which allow them to offer high level performance at extremely low cost The 1 912 1 920 terminals are compatible with most computers Standard features include editing capability protected field addressable cursor micro processor con trol line and character insert delete upper and lower case characters and tabbing Switchable transmis sion rates ranging from 75 to 9 600 baud are standard Also included as standard is a buffered serial printer port A 1 920 character second page display memory is optional on all models 3 0 SPECIFICATIONS 3 1 Monitor Size 12 inches diagonally measured Phosphor P4 non glare read out Displayed Character Set 96 character ASCII upper and lower case alphabet Number of lines 24 Characters per line 80 Screen capacity 1 920
31. ous posi tion are transmitted followed by a RETURN code Protected fields are bracketed by ESC and ESC sequences The last character on a line is followed by a US code 7 8 Conversation Mode Transmission Half Duplex Conversation Mode rear panel mode switch to HALF position Keyboard input causes graphics and control codes to be transmitted character by character and causes characters to appear on the display Operation of an edit or command key causes specified action to occur on the display but no codes are transmitted pts Full Duplex Conversation Mode rear panel mode switch to FULL position Keyboard input causes graphics and control codes to be transmitted character by character but graphics are dis played only upon receipt from the remote computer Operation of an edit or command key causes specified action to occur on the display but no code is transmitted 15 7 9 Self Test Mode The Self Test Mode may be used to verify proper operation of the video display circuitry the serial interfaces UART and control processor The test consists of the transmission of the com plete displayable character set with all attributes e g inverse underline protect exercised Terminal must be CONFIGURED in RS 232 Levels i e S5 6 Down and 55 7 Up To invoke the test perform the following operation 1 S Ls o 7 9 1 Disconnect any interface connectors to other devices P3 P4 Clear screen of all characters
32. right of the cursor Erases all character positions from cursor through end of dis play and replaces with Space Codes ESC Y or Null Codes ESC y if shifted TVI 920 only If Write Protect is on pro tected spaces or nulls will be written Note that if the entire page is protected in Protect Mode the cursor will stop in the Home position and no further character may be entered until an unprotected area is made available or Protect Mode is turned off Modifies the code transmitted by pressing another key RUBOUT DEL BREAK TAB CTRL I BACKTAB ESCI PAGE NEWLINE CTRL _ SHIFT PAGE NEWLINE ESC K CTRL K y CTRL J CTRL H BACKSPACE gt CTRL L 912B 920B 912C 920C ALL ALL ALL 912B 920B ALL 912B 920B ALL ALL ALL ALL 912C 920C ALL This key generates the standard ASCII ESC IBH Receipt of this code causes the following character to be interpreted as a Function command This key does not repeat This key is effective only in Conversation Mode Computer normally interprets RUBOUT as a character erase code Transmits the TT Y break signal In Protect Mode TAB key moves the cursor forward to the first unprotected character following a protected field If there is no following unprotected character the cursor moves to the home position If not in Protect Mode the cursor is moved to the next column Tab location If no more Tabs are set th
33. rotected location If the terminal is in Scroll Mode when Auto Flip is enabled scrolling is inhibited or over ridden by Auto Flip If the terminal is in Non Scroll or Protect Mode the Auto Flip works as described above To return to normal operational mode issue the 1 912 1 920 an ESC w In no case can more than the displayed page be transmitted by send line or send page nor can any other than the displayed page be printed If the second page option is not installed a clear unprotected to spaces will be performed on the current page 21 12 0 OPTION SWITCH SELECTION Modem Port Baud Rate 51 53 Printer Port Baud Rate NOTE ONLY ONE SWITCH DOWN 22222990015 ooooooiur Q 6 gt WO DIN MTL 110 baud 10 ws W12 P4 W22 23 P3 W14 15 16 17 52 55 51 53 COMPOSITE VIDEO P2 P7 w30 P5 R28 W26 27 28 29 PAGE 2 22 0 LI Os gt wo 44 3 CRT CONTROLLER UART PROGRAM ROM CPU 22 ERU 12 1 52 UART Terminal Options 1 Up Not used Down Not allowed 2 P Alternate Character Set option Down Standard Character Set 3 FULL DUPLEX i Down HALF DUPLEX 4 Qe 60 Hz Refresh Down 50 Hz Refresh 5 i No Parity Down Send Parity 6 Op 2 stop bits may be used with No parity as space parity Down 1 stop bit 7 1 number of Data Bits Down 7 may be used with no parity
34. ster 222 ES ERR EE RE WEE ERG UA 22 12 1 920ART Terminal Options uv pau a pat Reed oe AER RR Res 23 12 2 SB UART Terminal Options 23 Jumper Options Halt D uplexzActive cua is ee Mee ede bre M RACE Aer Oa CREAN DA 25 Half Duplex Passives ii cease as Eu Dace Pus ewe hp S coe RA eu n edad 25 Full Duplex sa essences Yow Oe adobe eu Y ars 25 Full Duplex Active 25 Control Board Switches Lo vu CORO eoe EATER Oe Apa ECT ORT i V sw D n On 26 Addressable Cursor tre eae Ib See ee ay ee REA LU b RN T MEA 28 Escape Sequences 2 38 e g glide me weite vu quee oUm eta eus 29 TVI 912 TVI 920 ASCII Chart llle eh hts 29 Operators Quick Reference Control es 31 LIST OF PHOTOGRAPHS 7 1 Keyboard FUNGUO dudo eam RN a aS RE a AI acl ib usd ee RES 8 TVI 920 Keyboard od se tec co ie SX cops a OE Ad RUE TN 19129 Keyboard 1 3 oeste peo aee b Adve Bde eise 8 7 9 1 TVI 912 TVI 920 Test Pattern S 16 12 0 Option Switch Selection nand a E a U a a E E a 22 12 2 Operator Controls iua A RS Par dd 24 Control Board Switches d Eu dt SERE 26 Terminal Interior 21 12 DLE
35. tion Steps Step 1 Making sure the power switch of the terminal is OFF plug the terminal power cord into grounded outlet Step 2 Connect the cable from the remote computer or modem to the interface connector 4 2 Main Interface Connector RS232C Connector Pin Signal List 1 Frame Ground AA 2 Transmit Data BA 3 Receive Data BB 4 Request to Send CA 5 Clear to Send CB 6 Data Set Ready opt 7 Signal Ground AB 8 Carrier Detect 20 Data Terminal Ready CD 25 Current Loop 13 Current Loop Transmit Current Loop Current Loop Receive gt Internal Strap Options for Active Passive See page 25 Jumper Options 4 3 Printer Interface Signal Name Frame Ground Serial Data RS232 Printer Ready Jumper Select Terminal Ready optional select Signal Ground Data Carrier Detect Printer Ready 5 0 5 1 5 2 5 3 INSTALLATION Local Installation The TVI 912 TV1 920 with a standard communications interface 85232 can be cabled directly to a local computer Remote Installation The TV1 912 920 can communicate with remote computers using a modem connected between the 1 912 920 and the communication lines Terminal TURN ON Procedure Step 1 Step 2 Step 3 Step 4 Step 5 First make sure that ON OFF switch at the rear of the terminal is in OFF position Plug the terminal cord into a grounded 115VA
36. ved a clock is started to clock in the remainder of the word character The word structure can be strapped to transmit and accept either one or two stop bits Generally baud rates of 110 and lower use 2 stop bits and rates of 150 and higher use 1 stop bit TVI 912 TVI 920 automatically transmits 2 stop bits at 110 baud If 8 data bits are selected bit 8 will be zero The parity bit is added to the transmission for error detecting If parity is used it follows the charac ter Normally even parity is used for asynchronous transmission and odd parity for synchronous transmission Even parity adds a O or 1 to the character to make the total number even This is checked by the receiver to see if something was lost in transmission Some computers do not have the ability to check for even or odd parity but do expect that transmission time to be filled with 1 or O This leaves 5 possibilities for parity 1 none 2 even 3 odd 4 zero 5 one sometimes called true The 912 920 does not allow for zero and true parity with an 8 bit word Bit Structure of Serial Data Word Switch Settings of S2 For Common Word Structures 0 UUUUUUCCEC ECUDUUCUO Y 09 00 Y Y Y Y Y adi a U Up D Down X Either Up or Down 10 0 SERIAL PRINTER INTERFACE OPTION TVI 912 TVI 920 Serial Printer Interface controls an auxiliary serial
37. y in a protected character position unless all positions are protected In that case the cursor will appear in the Home position CTRL ESC 912 9208 Sets the Terminal in Block Mode When in Block Mode the SHIFT BLOCK 912 920 typed characters are displayed and stored but not trans CONV mitted until a send function is activated Data may still be ESC B ALL received and displayed in Block Mode CTRL BLOCK 912C 920C Sets the Terminal in Conversation Mode When in Conversa CONV tion Mode characters typed are transmitted either in half ESC ALL or full duplex ESC ALL Causes all characters received at the modem port to be transmitted out the printer port at the same baud rate CRT screen continues to be updated except ESC A Enables page print only Characters received at the modem port will not be transmitted out the printer port 7 2 Function Keys Special function transmission is still possible in Block Mode and does not affect the contents of the display screen Operation of 11 keys F1 to F11 on the 171 920 causes transmission of the following three code sequence 1 SOH Control A 2 One of 11 characters 6 through J Hex 40 through 4 through Hex 60 through 6A if used with SHIFT CR Carriage return Control M 12 7 3 7 4 7 5 7 6 On the TVI 912 TVI 920 operation of the FUNC key with anoth
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