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Table of Contents

1.0 Introduction
1.1 System Features
1.2 Case Design
     1.2.1 Front View
     1.2.2 Rear View
     1.2.3 Left Side View
     1.2.4 Right Side View
     1.2.5 Bottom View
2.0 Basic Hardware Architecture
2.1 Main System
     2.1.1 MC68030 Microprocessor
     2.1.2 Optional MC68882 Coprocessor
     2.1.3 ROM
     2.1.4 System RAM
          2.1.4.1 SystemRAM Connector Pin List
               2.1.4.1.1 50-Pin Connectpr J17
               2.1.4.1.2 30-Pin Connector J6
     2.1.5 COMBO IC
          2.1.5.1 Memory Control Unit (MCU)
          2.1.5.2 Interrupt Mask and Status Control
               2.1.5.2.1 Interrupt Priority Level Signal Definition
          2.1.5.3 Bus Circuitry and Illegal Condition Detect
          2.1.5.4 Clock Dividers
          2.1.5.5 Chip Selects
          2.1.5.6 Paddle Circuitry
          2.1.5.7 Light Gun Circuitry
          2.1.5.8 Joystick Circuitry
          2.1.5.9 Blitter
     2.1.6 DMA Support
     2.1.7 Real-Time Clock
     2.1.8 System Timing and Bus Control
          2.1.8.1 68000 Bus Decode PAL U68
          2.1.8.2 68000 Bus Decode PAL U63
          2.1.8.3 68000 Bus Decode PAL U62
          2.1.8.4 68000 Bus Decode PAL U67
          2.1.8.5 68000 Bus Decode GAL U44
2.2 Audio/Video Subsystem
     2.2.1 Video System Overview
          2.2.1.1 Video RAM
          2.2.1.2 Interrupt and Data Load Control (COMBO)
          2.2.1.3 Video Shifter (VIDEL)
          2.2.1.4 Video Digital to Analog Converter (DAC)
          2.2.1.5 NTSC/PAL Encoder (1377)
          2.2.1.6 Monitor Connector Pin List
     2.2.2 Audio Subsystem
          2.2.2.1 Programmable Sound Generator
          2.2.2.2 DMA Sound
          2.2.2.3 Codec IC
2.3 I/O Subsystems
     2.3.1 SCSI II Interface
          2.3.1.1 External SCSI Connector Pin List

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     2.3.2 Floppy Disk (FDD)
          2.3.2.1 Internal Floppy Connector Pin List
     2.3.3 68901 MFP
          2.3.3.1 Interrupt Control
     2.3.4 8530 Serial Communications Controller (SCC)
          2.3.4.1 8530 Serial Port Pin and Signal List
          2.3.4.2 SCC LAN Connector Pinout
     2.3.5 Parallel Printer Port
          2.3.5.1 Parallel Port Connector Pin List
     2.3.6 Keyboard Interface
     2.3.7 Mouse and Joystick Interface
          2.3.7.1 Mouse and Joystick Interface Connector Pin List
     2.3.8 Game Controller Ports
          2.3.8.1 Game Controller Pinout
     2.3.9 ROM Cartridge
          2.3.9.1 ROM Cartridge Connector Pin List
     2.3.10 Musical Instrument Digital Interface (MIDI)
          2.3.10.1 MIDI Connector Pin List
     2.3.11 Digital Signal Processor (DSP)
          2.3.11.1 DSP Connector Pin List
     2.3.12 IDE Interface
          2.3.12.1 IDE Connector Pin List
     2.3.13 Expansion Connector
          2.3.13.1 Expansion Connector Pin List
               2.3.13.1.1 50-Pin Connector J19
               2.3.13.1.2 30-Pin Connector J20
2.4 Overall Block Diagram

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