The 1985 PC-8801 adventure Zodiac is now on Switch

D4 Enterprise released the 1985 PC-8801 title Zodiac for the Nintendo Switch today. It joins the EGG Console lineup of retro computer ports and is available now on the Japanese eShop.

Riverhill Soft would later become well known for the J.B. Harold Murder Club detective series. In 1985, the studio was exploring science fiction. Zodiac was part of a wave of early Japanese adventure games that combined static, highly detailed illustrations with text parsing. Players control a protagonist named Boy and his robot partner Amaroid Marie. The pair is searching for Boy's missing father, a space archaeologist named Dr. Dumas.

The story picks up five years after Dr. Dumas vanished. The search relies on tracking a specific blue crystal. This signal eventually pulls Boy and Marie toward a cluster of unmapped planets referred to as the Death Star Slum. The narrative unfolds entirely through text descriptions and static background art.

Typing in space

Before the industry standardized on point-and-click menus, adventure games required players to guess the exact verb and noun combinations the developers programmed. Zodiac uses this exact format. You have to tell the game to look at a crystal or take an item using the parser. To make this work on a console in 2026, D4 Enterprise built a virtual keyboard overlay that pops up over the gameplay window.

Players navigate this digital keyboard with the Switch analog stick or directional pad. Physical USB keyboards are supported when the Switch is docked. The game is compatible with Japanese 106, 108, and 109 key layouts. Typing commands out manually on a real keyboard is the most authentic way to play a PC-8801 game, even if the hardware running it is a modern Nintendo tablet.

The game retains its original 8-bit visual style. Japanese home computers in the 1980s were famous for their high-resolution pixel art. The PC-8801 could display sharp images, though it was restricted in how many colors it could show on screen at once. The artists at Riverhill Soft used careful dithering to create texture and shading on alien landscapes.

The title screen sets the tone immediately with a desolate, rocky surface littered with skeletal remains. Later environments introduce more color. One specific location has a bright swarm of red and yellow butterflies contrasting against a dark background. These static screens are the primary reward for solving the text puzzles.

The EGG Console catalog

D4 Enterprise has been running the Project EGG service on Windows PCs for years. That platform archives and sells emulated versions of vintage Japanese computer games. The EGG Console line is their effort to bring that catalog to the Nintendo Switch. The series focuses heavily on platforms like the PC-8801, PC-9801, and MSX2.

Zodiac is the latest addition to a lineup that now includes dozens of titles. Most of these games never received official English translations back in the 1980s. This Switch release maintains the original Japanese text. Players will need to understand the language to solve the parser puzzles, though the emulator's interface menus are localized in English.

Text parser adventure games can be punishing by modern standards. Playing them on a modern handheld is a strange collision of eras, but it beats tracking down working PC-8801 hardware just to type commands at a blue crystal.