the cutting room mirror

Sega CD

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This page details one or more prototype versions of Sega CD.

This prototype is documented on Hidden Palace.

SegaCD Hoshino BIOS.png

A developer version of the Sega CD BIOS was released by Hidden Palace on September 19, 2026. It is based on BIOS version 1.11 and its timestamp is 04/02-1992 20:30. As a result, it uses intro type 1 and UI type 1. It was created specifically for the BIOS dev team's sole artist (and future Sonic Team creative director!) Kazuyuki Hoshino utilizing a test image he had created for the purpose of developing the rotation and scaling animation effects.

(Source: Kazuyuki Hoshino on Twitter)

Differences#

  • The Mega CD graphic has been replaced with a modified version of the Sonic the Hedgehog title screen graphic, with "THE HEDGEHOG" byline redrawn to read "HOSHINO'S MEGA CD" instead.
    • The palette used on the background has been altered to be slightly darker due to using the extensive palette used for the Sonic graphic.
  • The version number is not present on the copyright string in the top right.

Mega CD v1.00

Mega CD Hoshino

SegaCD Hoshino BIOS.png
  • The Memory Management Menu does not load.