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Singer 1501 Service Manual
Intelligent terminal
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Operator instructions manual
(31 pages)
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Table Of Contents
251
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Contents
Table of Contents
Bookmarks
Table of Contents
List of Effective Pages
Contents
Illustrations
Tables
General Description
Models and Options Available
Location of Major Components
Controls and Indicators
Capabilities
Display and Keyboard
Processor
Memory
I/O Controller
Cartridge Tape Units
Weights and Dimensions
Dual Serial Input-Output
Communications Adapters
Power Requirements
Environmental Requirements
Ambient Temperature
Relative Humidity
Functional Description
General
Organization and Use of the Memory
Model 1501 Intelligent Terminal Block Diagram
Exchange of Data with the I/O Controller
Display Generation
Keyboard Inputs
Operation of the Cartridge Tape Units
Operation of the Communications Adapters
Serial Input-Output Channel
Processor Block Diagram
Word Formats
Memory Addresses
Typical Instruction Format
Organization of Memory
Memory Address Format
Instruction Addressing
Sample Address
Contents of Stack Pointer Addresses
Use of the Stack Pointer
Typical Location of Instructions in Memory
Data Addressing
Processor Timing
Instruction Cycles
Machine Cycle Timing Diagram
Cycles Required by each Instruction
Processor Instruction Set
Test Literal and Jump
Test Mask and Jump
Test Literal and Exit
TMX - Test Mask and Exit
BRU - Branch Unconditional
BRE - Branch on Equal
BRH - Branch on High
SBU - Stack and Branch Unconditional
SBE - Stack and Branch on Equal
SBH - Stack and Branch on High
SBL - Stack and Branch on Low
SMS - Set Memory Section
SMC - Set Memory Control
SSC - Set Memory Section and Control
LSW - Load Sense Switches
LPS - Load Processor Status
DPI - Disable Processor Interrupt
EPI - Enable Processor Interrupt
CPI - Clear Processor Interrupt
STA -- Store Accumulator
ADA - Add to Accumulator
ADX - Add to Index Register
SUA - Subtract from Accumulator
SER - Shift and Exclusive or to Accumulator
IRA - Inclusive or to Accumulator
SIR - Shift and Inclusive or to Accumulator
Cpa
Operation of Class 1 Decoder B15
Operation of Class 1 and 15X Decoder B16
Cycle Counters
Initial Conditions
Tape Loader
Tape Loader ROM Program
SIO Channel Loader ROM
SIO Channel Loader ROM Program
Interrupt Controls
Interrupt Controls Timing Diagram
To Summarize the ASB Operation
Branch Controls
Stall and Skip Conditions
Stack Pointer
Use of the U and V Bits
Address Net
Inputs from the Stack Pointer
Output of Memory Address Net
Inputs from the Memory Address Register
External Address Inputs
Selection of an Index Register
Selection of a Data Address
Memory Data Register
Register
Adder
Adder Controls
Output Switch
Memory Input and Output Multiplexers
Program Interlock
Execution of Class 0 Instructions
Execution of Class 1 Instructions
Execution of Class 2 Instructions
Execution of Class 3 Instructions
8,192-Byte Memory
Selection of the Memory Address
Memory Board
Memory Block Diagram
Address Applied to 8,192-Byte Memory
Organization of the 8,192 Byte Memory Array
Memory Timing
16,382-Byte Memory with Parity
Organization of the Memory Array
Data Input
Data Output
Address Multiplexers
Refresh Counter and Decoder
Refresh Control Circuits
Parity Errors
Internal Oscillator
Input-Output Controller
I/O Controller Block Diagram
Accumulator
Keyboard Control Circuits
Shift Control Circuits Timing Diagram
Format of I/O Status Word
CRT Display Control Circuits
Format of Display Area
Format of IWR for CRT Instructions
Command Register
Display Sequence in Normal Mode
Display Sequence in Interleaved Mode
Clock Circuit
Display Timing
2Mhz Clock Timing Diagram
Vertical Sweep Timing Diagram
Memory Addressing
Horizontal Sweep Timing Diagram
Addresses Applied to Memory
Formation of the Character a
Character Synchronization Counter
Character Synchronization Timing Diagram
Tape Control Circuits
Recording Method
Tape Commands
Format of Cartridge Tape Record
Tape Unit Selection
Tape Multiplex Circuits
Write Clock
Writing on the Tape
Write Operation Timing Diagram
Reading from the Tape
Read Operation Timing Diagram
Tape I/O Stall Circuits
Serial I/O Channel
Phase Encoded Signals
SIO Control Circuits Block Diagram
Transmission Techniques
Organization of Data on the SIO Line
Start Byte
Idle Byte
Status Byte
Address Byte
Idle Byte Format
Status Byte Format
Address Byte Format
SIO Channel Instructions
Command Byte Format
Data Byte Format
SIO Channel
Sequence of Operation in the Master Mode
Sequence of Operation in the Slave Mode
Input Data Register
Address Register and Detector
Data Multiplexer
Shift Register
Address Sequence Timing Diagram
Shift Register Control Circuits
Idle Detector
Output Data Register
Output Data Control Circuits
SIO Sprocket and Stall Circuits
I/O Operation Decoder
Synchronization Circuits
Nine-Counter Timing Diagram
Phase Decoder
Phase Decoder Timing Diagram
Phase Encoder
Phase Encoder Timing Diagram
Tape Motion Control Board
Cartridge Tape Unit Block Diagram
Command Decoding
Capstan Drive Amplifiers
Cartridge in and Locked
Clip-In
Supply and Take-Up Motor Drive
Motion Control Timing Diagram
Tape Amplifiers
End of Tape Circuits
Read Preamplifier Simplified Schematic
Record Format
Interrecord Gap
Selection of Tape Channel
Energy Detector and Data-Q Paths
Tape Amplifier Signals
System Reset Board
Reset Section
Input-Output Section
Tape Amplifier Timing Diagram
Power on Clear Timing Diagram
Dual Input-Output Section
Maintenance
Tools, Test Equipment, and Materials Required
Location of Model 1501 Major Components
Preventive Maintenance and Cleaning
Preventive Maintenance Schedule
Test Procedure
Serial I/O Failure Symptoms
Small CRT Failure Symptoms
Power Failure Symptoms
Keyboard Failure Symptoms
Removal and Replacement Procedures
Processor/Memory Board Removal and Replacement
I/O Controller and Communications Boards Removal and Replacement
Keyboard Removal and Replacement
CRT Visual Display Removal and Replacement
System Reset Board Removal and Replacement
Cartridge Tape Drive Removal and Replacement
Cartridge Tape Drive
Tape Amplifier Board Removal and Replacement
Location of Tape Speed Adjustments on the Motion Control Board
Capstan Removal and Replacement
Wired Module Removal and Replacement
Cooling Fan Removal and Replacement
Power Supply Removal and Replacement
S10 Channel Bootstrap Loader Board Removal and Replacement
Adjustment Procedures
CRT Display Adjustments
Crt/Speaker Adjustments
Speaker Volume Adjustment
Tape Speed Adjustment
Power Supply Adjustment
Location of Adjustment Potentiometers
Power Supply Voltage Adjustment
Power Supply Overvoltage Adjustment
Installation
Tools and Equipment Required
Unpacking
Installation Procedure
Systems Verification
Reference Data
Signal Glossary
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