FreeBSD, Junk & Network — a Sharp X68000 hobbyist's notebook

X68K.NET is the personal site of a Japanese Sharp X68000 enthusiast, documenting the Nereid-X expansion board project, X68 power supply repair work, server administration notes, and links to the wider X68000 community.

The Sharp X68000 remains one of the most beloved home computers ever produced in Japan, and this site exists as a living notebook for those who continue to keep the platform alive. While mainstream computing moved on decades ago, a dedicated community of hobbyists, collectors, and engineers still powers up these machines, repairs aging hardware, and discovers new ways to push them beyond their original specifications. The X68000's architecture, with its custom graphics and sound hardware, continues to fascinate those who appreciate what was possible in the late 1980s and early 1990s. This page serves as an entry point into that ongoing journey of preservation and exploration. A new project is available: building a passive cooling fan mount for X68000 expansion cards Building a passive cooling fan mount for X68000 expansion cards to keep your system quiet.

The Nereid-X expansion board project represents one of the more ambitious undertakings documented here, exploring how modern interfaces can be adapted to the X68000's legacy bus architecture. Projects of this nature require careful study of the original hardware schematics, reverse engineering of undocumented timing behavior, and patient iteration through prototyping cycles. For an enthusiast community that values both authenticity and innovation, such expansion efforts open new possibilities for storage, networking, and connectivity that were unthinkable when these machines first shipped. The documentation shared on this site aims to help others who might attempt similar projects, whether they are seasoned hardware hackers or newcomers finding their way into retrocomputing.

Power supply repair is a recurring theme for anyone maintaining aging X68000 hardware, since capacitors age, regulators drift, and connectors corrode over time. The units that shipped with these machines decades ago were built to a certain standard, but time takes its toll on every component. Rebuilding a power supply involves careful capacitor selection, attention to ripple and noise, and verification of all output rails under load. For collectors who want their machines to run reliably for years to come, understanding the basics of power supply restoration is essential. A new article Using a Logic Analyzer to Reverse Engineer the X68000 Video DAC details how a logic analyzer can be used to reverse engineer This site shares practical approaches to diagnosing common failure modes and returning these classic machines to dependable operation.

Beyond the hardware itself, the X68000 community thrives through shared knowledge about software, games, and utilities that defined the platform's library. From system-level programming to the many titles that showcased the machine's graphical capabilities, there is a rich cultural history worth preserving. The site curates links and resources pointing toward the wider ecosystem of forums, archives, and personal pages maintained by enthusiasts around the world. Even as original media degrades and floppy disks fail, the collective effort to archive and document what the X68000 offered ensures that future generations can experience and understand this distinctive chapter in computing history.

Server administration notes on this site reflect a parallel interest in modern infrastructure, connecting the retrocomputing hobby with practical systems management. Running services on contemporary hardware, configuring network stacks, and maintaining reliable uptime are skills that translate across eras of computing. For the X68000 enthusiast who also happens to manage their own servers, there is a natural crossover between preserving old systems and operating new ones. The notes shared here cover the kinds of day-to-day tasks that keep personal infrastructure healthy, from routine maintenance to troubleshooting unexpected behavior, all written from the perspective of someone who appreciates the fundamentals of how computers actually work.

The personal nature of this site is part of its charm, reflecting the voice of an individual who documents their projects, experiments, and discoveries as they happen. This approach stands in contrast to polished institutional archives, offering instead a genuine record of how hobbies evolve over time. Readers can follow along with ongoing work, revisit past successes and failures, and gain insight into the thinking behind technical decisions. For those who share similar interests, this kind of unfiltered documentation is often more valuable than formal manuals, because it captures the real process of learning, troubleshooting, and eventually succeeding with difficult projects.

Community links featured on this site connect visitors to the broader network of X68000 enthusiasts scattered across the internet. Many of these individuals maintain their own pages documenting repairs, software collections, hardware modifications, and personal recollections of using the machine when it was current. The culture of personal homepages has persisted within this niche, with each contributor adding their own perspective and expertise to the collective knowledge base. For newcomers, these links serve as a map of where to find answers, inspiration, and fellow travelers. For veterans, they are a reminder that the community continues to grow and evolve even as the hardware itself ages.

The intersection of retrocomputing with modern technology is a recurring theme throughout this site, whether through USB adapters, network interfaces, or storage solutions that bring contemporary convenience to decades-old hardware. Finding ways to bridge the gap between old and new is part of what keeps these machines usable and enjoyable today. The process of making an X68000 talk to modern peripherals or join a home network is both a technical challenge and a rewarding achievement. This site documents those efforts in the spirit of sharing, hoping that the accumulated experience might save others time and inspire them to attempt their own projects with these remarkable machines.