OMNIBYTE OB688K1A Manuals

Manuals and User Guides for OMNIBYTE OB688K1A. We have 1 OMNIBYTE OB688K1A manual available for free PDF download: User Manual

OMNIBYTE OB688K1A User Manual

OMNIBYTE OB688K1A User Manual (119 pages)

Brand: OMNIBYTE | Category: Motherboard | Size: 6.58 MB

Table of Contents

Table of Contents
3
1 Introduction I Installation

9
2 Overview of the Computer Board

12
- Power Requirements
  12
- Summary of Features
  12
- Bus Arbitration
  14
3 General Description of 0 B6SK1A

14
- Parallel Interface
  14
- Serial Interface
  14
- Timer
  14
- On-Board Dynamic RAM
  15
  - Address Decoding and Memory Mapping
    16
- On-Board Memory
  15
- On-Board Read Only Memory
  15
- External RAM Access Address (SW-4)
  17
- I/O Base Address Selection (SW-2)
  17
- RAM Address Selection (SW-1)
  17
- ROM Address Selection (SW-3)
  17
- Operational Considerations
  18
- Undecoded Addresses
  18
  - Transfer Acknowledge and Bus Errors
    18
  - Function Codes
    19
  - Clocks
    19
- Baud Rate Clock
  20
- Bus Clock and Constant Clock
  20
- Interrupts
  20
- Processor Clock
  20
- The E Clock
  20
- Single-Step Mode
  21
  - Restart Vector Accessing
    21
  - Front Panel Connector
    21
  - Transparent Mode (K10)
    24
  - Baud Rate Selection (K18, K19)
    26
- 4 User Definable Options
  
  22
  - Status Indicators
    21
  - Serial Port Configuration (K25, K26)
    24
  - Manual Baud Rate Selection
    26
  - Software Baud Rate Selection
    27
    
    Bus Error Jumper (K6)
    28
    
    DTACK Select (K20,K21)
    29
    
    Interrupt Priority (K2)
    31
    
    CCLK and BCLK (K14, K4)
    32
    
    Bus Arbitration (K5, K7, K8, K9)
    33
    
    Initialize (K3)
    34
    
    ROM Socket Configuration (K22)
    34
    
    ROM Size Jumper Configuration
    35
    
    Timer (K16, K17)
    38
    
    External RAM Access (K12, K27)
    39
    
    Optional Front Panel (K1)
    40
    
    Watchdog Timer for External RAM Access (K23)
    40
    
    Miscellaneous Jumper Identification
    42
    
    System Configuration
    47
- 5 Connector Pinouts
  
  47
- 6 Memory Decoding
  
  53
  - Memory Maps
    53
  - I/O Address Assignments
    58
  - Motorola MEX68KDM Compatibilty
    60
  - OB68K1/0B68K1A Compatibility/Enhancements
    60
  - 68000 Memory Organization
    61
  - OB68K1A Schematic Diagrams
    63
- 7 Terminal Monitor Programs
  
  70
- 8 Warranty Information
  
  71
10 Appendix (Data SHEETS)

72
9 Ordering Information

72

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