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Manuals
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OMNIBYTE Manuals
Motherboard
OB688K1A
User manual
OMNIBYTE OB688K1A User Manual
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Contents
Table of Contents
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Table of Contents
Table of Contents
1 Introduction I Installation
Compatibility with Multibus Products
Inspection
Introduction
Unpacking Instructions
Factory Standard Configuration
2 Overview of the Computer Board
Power Requirements
Summary of Features
Bus Arbitration
3 General Description of 0 B6SK1A
Parallel Interface
Serial Interface
Timer
On-Board Dynamic RAM
Address Decoding and Memory Mapping
On-Board Memory
On-Board Read Only Memory
External RAM Access Address (SW-4)
I/O Base Address Selection (SW-2)
RAM Address Selection (SW-1)
ROM Address Selection (SW-3)
Operational Considerations
Undecoded Addresses
Transfer Acknowledge and Bus Errors
Function Codes
Clocks
Baud Rate Clock
Bus Clock and Constant Clock
Interrupts
Processor Clock
The E Clock
Single-Step Mode
Restart Vector Accessing
Front Panel Connector
Transparent Mode (K10)
Baud Rate Selection (K18, K19)
4 User Definable Options
Status Indicators
Serial Port Configuration (K25, K26)
Manual Baud Rate Selection
Software Baud Rate Selection
Bus Error Jumper (K6)
DTACK Select (K20,K21)
Interrupt Priority (K2)
CCLK and BCLK (K14, K4)
Bus Arbitration (K5, K7, K8, K9)
Initialize (K3)
ROM Socket Configuration (K22)
ROM Size Jumper Configuration
Timer (K16, K17)
External RAM Access (K12, K27)
Optional Front Panel (K1)
Watchdog Timer for External RAM Access (K23)
Miscellaneous Jumper Identification
System Configuration
5 Connector Pinouts
Multibus P1 and P2 Connectors
PIA and ACIA Connectors
Compatible Cable End Connectors
6 Memory Decoding
Memory Maps
I/O Address Assignments
Motorola MEX68KDM Compatibilty
OB68K1/0B68K1A Compatibility/Enhancements
68000 Memory Organization
OB68K1A Schematic Diagrams
7 Terminal Monitor Programs
8 Warranty Information
10 Appendix (Data SHEETS)
9 Ordering Information
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MC68000"SI
NG LE BOARD -COM
PUTE'R,
USER'S MANUAL .
01·
OMNISvTE .
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