Dimension 68000
Introduction
The Dimension 68000, introduced by Micro Craft Corporation in 1983, represents a noteworthy innovation in the world of microcomputers. Designed to emulate various popular computing environments, including the Apple II, IBM PC, and CP/M-centric systems, this computer sought to provide users with a versatile and powerful platform. Centered around the Motorola 68000 microprocessor, the Dimension 68000’s unique architecture allowed it to function not only as an emulator but also as a standalone machine capable of running native applications. Despite its promising features and relatively advanced design for its time, the computer experienced a mixed reception and a brief market presence, lasting only three years before Micro Craft faced financial difficulties. This article explores the specifications, development, reception, and legacy of the Dimension 68000, providing a comprehensive understanding of its place in computing history.
Specifications and Design
The Dimension 68000 is characterized by its robust physical design and impressive specifications for its era. The main unit measures 18 by 18 by 6 inches (46 by 46 by 15 cm) and weighs between 22 to 27 pounds (10 to 12.2 kg), depending on configuration. Constructed with a steel chassis featuring a cream-painted lid to mitigate RF interference, the early models incorporated Noryl thermoplastic materials for added durability. Micro Craft encouraged user servicing, allowing owners to access and modify their machines without voiding the warranty.
Main Unit Features
At its core, the Dimension 68000 features dual 5.25-inch floppy disk drives and has six expansion slots for additional hardware capabilities. The computer comes equipped with an RS-232 serial port, a Centronics-style parallel port, and composite video output for graphics display. Powering the unit is a 100-watt switched-mode power supply designed to support various configurations and additional hardware that users might wish to install.
Motherboard and Memory
The motherboard of the Dimension 68000 is a four-layer printed circuit board housing the Motorola 68000 microprocessor clocked at 8 MHz. It supports up to 512 KB of RAM natively, expandable via coprocessor cards that could increase total memory capacity up to 16 MB. The system utilizes socketed chips rather than soldered ones for easier upgrades. The stock configuration shipped with only 256 KB of RAM but was designed to accommodate future expansions seamlessly.
Expansion Capabilities
A defining feature of the Dimension 68000 is its expansion bus and coprocessor cards that enable emulation across different computing platforms. These cards allow users to run applications from various systems while retaining a single hardware base. Although users could operate the computer without any emulation cards as a standalone system, most found value in the cross-platform capabilities offered by these expansions.
Coprocessor Cards
Micro Craft initially released three coprocessor cards: an IBM PC emulation card, an Apple II emulation card, and a CP/M card for Zilog Z80-based systems. Each card provided varying degrees of compatibility with its respective platform while running under the control of the Motorola 68000 processor. For example, when using the IBM PC card, users could boot from an “emulation master” disk that facilitated access to specific software environments.
Emulation Modes
The Dimension 68000’s emulation capabilities were considered groundbreaking at the time; however, they did come with certain limitations. While most emulators offered decent performance compared to their native counterparts, they were not without flaws. Users had to carefully configure settings specific to each emulation mode—especially for the Apple II card—where detailed parameters had to be specified for optimal functioning.
Software and Operating Systems
The native operating system for the Dimension 68000 was CP/M 68K—a version of CP/M adapted for the Motorola architecture. Alongside this were other software options such as Mirage OS and SofTech Pascal aimed at multi-user environments. Micro Craft initially promised Unix compatibility but delivered it only two years post-launch due to various development challenges.
Third-Party Software Support
While some third-party developers showed interest in creating software for the Dimension 68000—like CLYDE for VLSI circuit design—support remained limited compared to competitors like IBM and Apple over time. Additionally, users could purchase third-party applications tailored for specific coprocessor setups or native use; however, these were often insufficient in number relative to more established operating systems.
Development Journey
The creation of the Dimension 68000 was driven largely by Mike Carpenter’s vision of interoperability among computing platforms. Carpenter’s background in scientific instrumentation provided him with insights into creating an advanced microcomputer that met emerging user needs for compatibility across several environments. Development began shortly after founding Micro Craft Corporation in Dallas in November 1981.
Launch and Market Performance
The first units were shipped in October 1983, retailing at $3,995 for the base model without any expansion cards—an investment that quickly rose to $6,250 when fully equipped with all available coprocessors. Despite generating considerable initial interest—evidenced by thousands of inquiries following promotional campaigns—the Dimension struggled against established players like IBM and Apple due to both pricing and market positioning challenges.
Reception and Legacy
The reception of the Dimension 68000 was mixed; while some praised its innovative design and emulation capabilities, others criticized it as impractical for most consumers due to high costs and performance issues in native modes when compared to dedicated systems. Reviews highlighted both its strengths—such as hardware reliability—and weaknesses like limited software availability within its ecosystem.
Market Challenges
Micro Craft’s financial struggles culminated in Chapter 11 bankruptcy in early 1985; although they briefly continued operations afterwards under new management, the company eventually ceased production of the Dimension line altogether after failing to secure a foothold against more dominant competitors in the industry.
Conclusion
The Dimension 68000 remains an intriguing chapter in computing history—a bold attempt at creating a multi-platform computer that offered potential flexibility but ultimately fell short of commercial success. While it introduced innovative features aimed at emulating popular systems seamlessly under one roof, various limitations regarding performance and cost led many users back toward traditional platforms better suited for their needs. Despite its short-lived existence, the Dimension laid groundwork that would influence future designs emphasizing compatibility across diverse computing environments.
Artykuł sporządzony na podstawie: Wikipedia (EN).