Texas Instruments 990 User Manual

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LIST OF ILLUSTRATIONS (Continued)
Figure
Title Page
1-31 Model 911 VDT Controller Block Diagram .................................... .1-49
1-32 Video Line Driver ..................................................... 1-51
1-33 Model 911 VDT Built~In Test Logic ......................................... 1-51
1-34 Model 911 VDT Keyboard Logic ........................................... 1-53
1-35 Keyboard Logic Flowcharts .............................................. .1-54
1-36 CRU Interface Logic .................................................. .1-55
1-37 Refresh Memory Block Diagram ............................................ 1-60
1-38 Refresh Memory Data Path ............................................... 1-63
1-39 Memory Read and Write Control Logic ....................................... 1-65
1-40 Memory Addressing Logic ............................................... .1-67
1-41 Flowchart for Memory Write Operation ...................................... .1-69
1-42 Flowchart for Memory Read Operation ...................................... .1-70
1-43 Display Screen Refresh Cycle Flowchart ..................................... .1-71
1-44 Video Output Logic .................................................... 1-73
1-45 Model 911 VDT Character Matrix Formats .................................... .1-75
1-46 Model 911 VDT Displayed United States Character Set, Including Graphics Symbols ......... 1-7 6
1-47 Model 911 VDT International Displayed Character Set. ........................... .1-78
148 Model 911 VDT Alarm Logic ............................................. . l-79
1-49 Model 911 Video Display Controller Time Base Generator Oscillator and Dot Clock ........ .1-81
1-50 Model 911 VDT Time Base Generator Character Synchronization Logic ................ .1-83
1-51 Model 911 VDT Dot Counter Outputs ....................................... .1-85
1-52 Model 911VDT960-Character Display Character Address Counting Scheme ............. .1-86
1-53 Model 911 VDT 1920-Character Display Character Address Counting Scheme ............ .1-87
1-54 Model 911 VDT Sync Timing Diagram ...................................... .1-91
2-1 Model 990 Computer Hot Mock-Up System for 60-Hertz Model 911 VDT Testing ........... 2-2
2-2 Model 990 Computer Hot Mock-Up System for 50-Hertz Model 911 VDT Testing ........... 2-3
2-3 CD Verb Entry ....................................................... 2-7
2-4 United Kingdom Model 911 VDT Keyboard Matrix Chart ........................... 2-10
2-5 VDT Controller Assembly Configuration ...................................... 2-17
2-6 CRU Interface Waveforms During Exercise by the CD-C Verb ........................ 2-23
2-7 Timer Signal Relationships ............................................... 2-26
2-8 Alarm Signal Timing Diagram ............................................ .2-29
2-9 Model 911 VDT Controller Keyboard Logic Timing Diagram ......................... 2-31
2-10 CRT Monitor Schematic Diagram, Source 1 (M3960-392/-393) ....................... 2-39
2-11 CRT Monitor Schematic Diagram, Source 2 (TV120/-0200133) ....................... 2-41
2-12 CRT Monitor Schematic Diagram, Source 3 (D12 Series) .......................... . 243
Table
1-1
1-2
1-3
1-4
L!ST OF TA.BLES
Title
Page
Model 911 VDT Built-In Test Signals With CRU Output Bit 9 = 1 and
CRU Output Bit F
16
= 0 .............................................. .1-15
Model 911 VDT Built-In Test Keyboard Simulation Data .......................... .1-16
Model 911 VDT Power/Logic PWB-to-CRT Monitor Interface Signal Characteristics ......... .1-22
Contact Matrix Connections and Associated Diodes for United States and European
Model 911 VDT Keyboards ............................................ .1-28
viii
Digital Systems Division

Texas Instruments 990 Specifications

General

Brand	Texas Instruments
Model	990
Category	Desktop
Language	English