Sega Dreamcast with some design differences (other design under GD Drive cover)

• Different name of Extension Port (ExtenTion), sticker on System ROM Chip with "BTR 0.822 9160". R10049 sticker on backside.Mainboard revision 171-7782A.
• Bios loads with no ask to time set with 01.01.1950. It see Japanese retail games but reset game boot after "produced by or under license from sega enterprises ltd" and return to system bios menu.
• The hidden 3D version of the menu is missing from the current BIOS. It can't be activated via Puyo Puyo Fever save game.
• Dreamcast logo in top left corner of bios main menu slightly more to the left.
• The factory stamp on the back of the case indicates the production time as August 1998.
• There is no temperature sensor for the heat pipe and the console starts without it.
• This prototype features an exclusive, more expensive case material — a blend of polycarbonate and ABS plastic. All retail consoles are made of ABS plastic.
• Console refuses to output a picture via the Scart cable, only outputting audio. Most likely, output via this signal type hasn't been implemented yet, as is the case with many prototype games on retail Dreamcasts where image via Scart is missing.
• Prototype with the same design under GD Drive cover as was shown on Windows World Expo Tokyo 98 between the 1st and 4th of July, 1998 At that time, there was no finished hardware inside the case. Source: https://segaretro.org/History_of_the_Sega_Dreamcast/Development
• There are some minor differences on the motherboard from retail like R533 resistor and the pad for it are missing.
• The foam gasket on the side of GD drive is not black, but blue.