Blue Ring Binder Cover: MCS 920B Technical Manual Spine: Vol. 4 Technical Manual Logic & Circuit Diagrams MCB 143 Copy No. A/275 920B COMPUTER Contents list 1-4 Issue 1, 5-6 Issue 2, 7 Issue 1 PART 1: CENTRAL PROCESSOR 322D8025 A1 Interconnection Diagram for MCS 920B System 322B7007 A2 Typical Board layout 920B Computer A-FA 322C7432 A3 MCS 920B Computer Connector and Unit Layout 322C3986 A4 920B Register Structure Block Diagram 322C3986 A5 MCS 920B Computer Block Diagram 322A7191 A6 920B L.S.A. Element Logic Symbols and Circuit Diagrams Issue 6 Sht 1 LSA 01 2 Input NAND Gate Issue 4 Sht 2 LSA 02 3-Input NAND Gate Issue 2 Sht 3 LSA 03 4-Input NAND gate + 2 Inverters Issue 2 Sht 4 LSA 04 Control Matrix Waveform Amplifiers Issue 2 Sht 5 LSA 05 Issue 2 Sht 6 LSA 06 Issue 4 Sht 7 LSA 07, 13, 34 Pulse Generator Issue 3 Sht 8 LSA 08 Voltage Reference Issue 3 Sht 9 LSA 09, 14 Pulse Generator Issue 3 Sht 10 LSA 11 Cable Transmitters Issue 2 Sht 11 LSA 12 Cable Receivers Issue 2 Sht 12 LSA 15 2-input NAND Gate + 2 Inverting Drivers Issue 2 Sht 13 LSA 16 F-Minilog Drivers Issue 3 Sht 14 LSA 17 paper Tape Receiver Issue 3 Sht 15 LSA 18 Single I/P Noise Rejection Inverter Issue 3 Sht 16 LSA 19 Delay Issue 3 Sht 17 LSA 20, 24, 25 Delay Issue 3 Sht 18 LSA 21 Delay Issue 3 Sht 19 LSA 22 Two Input Transmitters Issue 2 Sht 20 LSA 23 Gated Receivers Issue 3 Sht 21 LSA 26 2-Input NAND Gate and Single Lamp Driver Issue 3 Sht 22 LSA 27 Regenerable Monostable Issue 3 Sht 23 LSA 28 2-Input NAND Gates Issue 3 Sht 24 LSA 29 Teleprinter Receiver Issue 3 Sht 25 LSA 30 Teleprinter Line Driver + AND - OR Gate Issue 2 Sht 26 LSA 30 Issue 3 Sht 27 LSA 33 Level Shifter Issue 2 Sht 28 LSA 43 Voltage Rail Sensing Issue 2 Sht 29 LSA 44 2-Input NAND Gate Issue 2 Sht 30 LSA 129 Single Pulse Generator Issue 2 322D8267 A7 920B Register Bits 1-18 322C8607 A8 920B Computer Overflow Logic 322D8268 A9 Logic of Registers Adding and Overflow Units 322D7973 A10 920B Multiply/Divide Shift and Overflow Logic 3 sheets 322D7880 A11 920B Control Sequence Functions 0-9 2 sheets 322D7881 A12 920B Control Sequence Functions 10-15 2 sheets 322D7952 A13 920B Input/Output Overall Logic 2 sheets 322D7972 A14 920B Computer Store Logic and General Flow Diagram 2 sheets 322D8069 A15 920B Computer Manual Controls and Store Heater Logic 322D7907 A16 920B Computer Matrix Address Function Decode and Conditionals 322D7948 A17 920B Computer Initial Instructions 322D8070 A18 920B Computer Control and Interrupt Overall Logic 2 sheets 322D7959 A19 920B Computer Register Module and Control Waveforms 2 sheets 322D7953 A20 920B Computer Matrices for Functions 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 And 11 4 Sheets 322D8606 A21 Main Timing Loop 322D4941 A22 920B Computer Control Unit Circuit Diagram 322D4197 A23 920B Store Control Chain (A-EB3 Unit) 322C4195 A24 920B Computer A-EA3 Unit MSB 2038 A25 Sequence of Accumulator and G-Register when Reading in Tape Function 15 322D7936 A26 Y Selection System for 920B Stores 322D7934 A27 X1-64 Selection System for 920B Stores 322D7930 A28 X65-128 Selection System for 920B Stores 322C4201 A29 920B Store Circuit Diagram A-ED3 322D8266 A30 Basic Circuit of Matrix Drive System 322D7931 A31 920B Process Counter 322C2781 A32 Circuit Diagram for Selection Diodes 920 A-AE Unit 322D4199 A33 Circuit Diagram A-EC3 Unit (920B Master Drivers) Issue 4 MSB 2023 A34 Block Diagram 920B Computer A-GZ Unit Temperature Sensing and Control 322C4885 A35 Circuit Diagram A-GZ Unit Temp Sensing & Control) Issue 6 PART 2: THE ADDITIONAL STORE 322B7452 B1 Sht 1 Extra Store 8192 Word 18 bit without SAC Connector and Unit Layout 322B8231 B1 Sht 2 920B Computer Additional Store 16,384 Word Connector and Unit Layout 322C7393 B2 Sht 1 920B Additional Store (without Access Control) Block Diagram MSD 2310 B2 Sht 2 920B 16384 Words Additional Store System Block Diagram 332A5997 B3 Circuit Diagram for B-S1 Unit 322B8087 B4 920B Computer Interconnection Diagram for Additional 8192 Words Store 322D5416 B5 920B Additional Store (without Access Control) System Logic 322D5483 B6 Board A-JC Diplexing and Inverting 920B Additional Store 322C5740 B7 Board A-JJ Link Board Position 50 322C5469 B8 Board A-HX Link Board Position 51 322D5471 B9 Board A-HT Diplexing and Inverting 920B Additional Store 322D5468 B10 Board A-HY Receivers, Transmitters and Inverters 920B additional Store 322D5467 B11 Board A-HS Output Data Transmitter 920B Additional Store 322D5466 B12 Board A-HR Input Receiver ([NOT] FATA) 920B Additional Store 322D5472 B13 Board A-HK Store Select logic 920B Additional Store 322C5731 B14 Board A-FU Extra Store Transmitters Board Position 27 322C5732 B15 Board A-FV Extra Store Receivers Board Position 26 322B7433 B16 Extra Store 8192 Word 18 bit with SAC Connector and Unit Layout 322D7394 B17 920B Additional Store (with Access Control) Block Diagram 322D5417 B18 920B Additional Store (with Access Control) System Logic 322C5489 B19 Board A-HO Priority Select Logic Board Position 40 322C5488 B20 Board A-HN Channel Select Logic Board Position 41 322C5487 B21 Board A-HQ Select Channel Drivers Board Function [ Position?] 42 322C5486 B22 Board A-HP TR Regenerator Board Position 43 322C5481 B23 Board A-JF Position 45 Output Transmitters Further Store 322C4580 B24 Board A-JD Output Data Transmitters to peripheral Position 46 322C5473 B25 Board A-HU Input Receivers Board Position 56 322C5485 B26 Board A-JH SSI Inputs and J14-16 Inverters Position 50 322C5484 B27 Board A-JG Position 53 Diplexing, Inverters and Transmitters 322C5482 B28 Board A-JB Position 54 Output Data Diplexing Computer Transmitter 322C5490 B29 Board A-JK Store Select Logic Board Position 57 Blue Ring Binder Cover: MCS 920B Technical Manual Spine: Vol. 4 Technical Manual Logic & Circuit Diagrams MCB 143 Copy No. A/219 PART 3: PAPER TAPE SYSTEM MSB 2044 C1 920B Computer paper Tape Controller Connector and Unit layout 322D4917 C2 Logic Diagram paper Tape Control Mk 1 322C3549 C3 Logic Diagram (A-AR3) Reader Control 2 322C5121 C4 Logic Diagram A-AQ3 Unit 322C2481 C5 Logic Diagram A-AP3 Unit Reader Register 322C4611 C6 Paper Tape Controller Board AFX Position 5 322C2482 C7 Logic Diagram A-AO3 Punch Control 2 322C2650 C8 Logic Diagram A-AN3 Punch Control 1 322C2611 C9 Circuit - Logic Diagram A-AM3 Unit Punch Register 322C2805 C10 920B Computer Logic Diagram A-AM3 Punch Drivers 322D8067 C11 920B Computer Logic Diagram Program Loading Unit 322D5942 C12 Program Loading Unit Chassis and panel Assembly MSC 2269 C13 Automode Connections with Program Loading Unit Fitted MSB 2263 C14 Automode Connections at Computer SKT11 when Start Address Plug or Program Loading Unit is connected C15 Paper tape Station MCB 66 Typical Paper Tape Station layout (Rack) 322TD004 C16 Paper tape Station MCB 66 Interconnections (Rack) 322TD005 C17 Paper Tape Station MCB 66 A.C. Distribution 322TD006 C18 Paper Tape Station MCB 66 D.C. Distribution 322C7968 C19 Paper Tape Station MCB 66 Teleprinter and Paper Tape Control Unit (missing) 322TD007 C20 Paper Tape Station MCB 66 Selection and Timing 322TD008 C21 Paper Tape Station MCB 66 Reader Control Logic 322TD009 C22 Paper tape Station MCB 66 Data Output Transfer 322TD010 C23 Paper Tape Station MCB 66 Punch Control Logic 322TD011 C24 Paper Tape Station MCB 66 Logic Board Components 322TD012 C25 paper Tape Station MCB 66 Reader/Punch Driver 322TD013 C26 Paper Tape Station MCB 66 Teleprinter A.C. Distribution 322TD014 C27 Paper Tape Station MCB 66 Teleprinter D.C. Distribution 322TD015 C28 Paper Tape Station MCB 66 Teleprinter Selection and Timing 322TD016 C29 Paper Tape Station MCB 66 Teleprinter Control Logic 322TD017 C30 Paper Tape Station MCB 66 Teleprinter Clock Logic 322TD018 C31 Paper Tape Station MCB 66 Teleprinter Logic Board Components (missing) 322TD019 C32 Paper Tape Station MCB 66 Teleprinter Clock DPS 14 322TD020 C33 Paper Tape Station MCB 66 On Line Adaptor DP4 PART 4: POWER SUPPLIES 322D5400 D1 920B General Schematic 24V Power Supplies 322D4954 D2 920B Computer Power Supply (Military Pack) CCT Diagram C-H Board 322D4983 D3 920B Computer Power Supply (Military pack) CCT Diagram A-HG Board 322D4953 D4 Logic Diagram A-HHI Unit 322D4972 D5 920B Computer Power Supply (Military Pack) CCT Diagram A-HJ Board 322D7819 D6 920B Computer Power Supply mains Input MCB 24 322D8083 D7 920B Computer Power Supply MCB 23 322D8064 D8 920B Computer Power Supply MCB 29 322D8038 D9 920B Computer P.T. Station Power Unit MCB 30 322D7738 D10 Paper Tape Power Supply MCB 32 PART 5: OPERATIONAL/TEST EQUIPMENT 322D4973 E1 Circuit Diagram Display Unit 322C4903 E2 Circuit Diagram Margin Test Unit MSB 2264 E3 Start Address Plug Connections