A rare piece of Sega history has been preserved: a custom Mega CD (Sega CD) BIOS made specifically for Sonic Team Creative Director Kazuyuki Hoshino.
The discovery was highlighted by preservation group Hidden Palace and uploaded by a contributor known as gageiro, revealing a Sonic-themed BIOS image that replaces the standard Mega CD logo with the text 'Hoshino's Mega CD.'
Kazuyuki Hoshino, who joined Sega in 1991 and later rose to prominence guiding the Sonic the Hedgehog franchise as Sonic Team's Creative Director, worked on the Mega CD add-on during the early years of his career.
The Mega CD (released as the Sega CD in some regions) is an add-on for Sega's Mega Drive (marketed as the Genesis in North America) and required firmware—commonly called a BIOS—to boot and run its hardware.
According to Hoshino's account of the item, he was a newly hired member of the Mega CD development team and served as the sole artist on that project.
He noted that the team managed to implement hardware-based rotation and scaling on Sega hardware—features often associated with the Super Nintendo—and that he produced test graphics used during development.
Hoshino recalled that, because he was the youngest staffer on the team, his coworkers created a personalized BIOS image for him; seeing the preserved file now brings back strong memories and gratitude for those early collaborators.
Hidden Palace is an established archive focused on video game preservation; the group has previously published prototypes, firmware, and development materials for retro systems.
The resurfacing of Hoshino's custom BIOS offers a tangible glimpse into how Sega supported internal developers and artists during the Mega Drive/Genesis era.
Hoshino later became known for his role at Sonic Team on multiple Sonic releases.
The Sonic franchise continues to appear on modern platforms, including releases on the Nintendo Switch and the Switch eShop—most notably Sonic Mania, which launched in 2017 and brought a retro-focused title to current-generation hardware.
This preservation entry reinforces the importance of archival work by communities like Hidden Palace and demonstrates how development-era artifacts illuminate the careers of prominent figures such as Kazuyuki Hoshino and the technical history of Sega hardware like the Mega CD/Sega CD and Mega Drive/Genesis.
The discovery was highlighted by preservation group Hidden Palace and uploaded by a contributor known as gageiro, revealing a Sonic-themed BIOS image that replaces the standard Mega CD logo with the text 'Hoshino's Mega CD.'
Kazuyuki Hoshino, who joined Sega in 1991 and later rose to prominence guiding the Sonic the Hedgehog franchise as Sonic Team's Creative Director, worked on the Mega CD add-on during the early years of his career.
The Mega CD (released as the Sega CD in some regions) is an add-on for Sega's Mega Drive (marketed as the Genesis in North America) and required firmware—commonly called a BIOS—to boot and run its hardware.
According to Hoshino's account of the item, he was a newly hired member of the Mega CD development team and served as the sole artist on that project.
He noted that the team managed to implement hardware-based rotation and scaling on Sega hardware—features often associated with the Super Nintendo—and that he produced test graphics used during development.
Hoshino recalled that, because he was the youngest staffer on the team, his coworkers created a personalized BIOS image for him; seeing the preserved file now brings back strong memories and gratitude for those early collaborators.
Hidden Palace is an established archive focused on video game preservation; the group has previously published prototypes, firmware, and development materials for retro systems.
The resurfacing of Hoshino's custom BIOS offers a tangible glimpse into how Sega supported internal developers and artists during the Mega Drive/Genesis era.
Hoshino later became known for his role at Sonic Team on multiple Sonic releases.
The Sonic franchise continues to appear on modern platforms, including releases on the Nintendo Switch and the Switch eShop—most notably Sonic Mania, which launched in 2017 and brought a retro-focused title to current-generation hardware.
This preservation entry reinforces the importance of archival work by communities like Hidden Palace and demonstrates how development-era artifacts illuminate the careers of prominent figures such as Kazuyuki Hoshino and the technical history of Sega hardware like the Mega CD/Sega CD and Mega Drive/Genesis.
