Dreamcast Technical Pages
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Dreamcast Insides
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Here we can see the Power Supply on the right hand side, the GDROM (1.2 GigaByte CD-ROM), the controller ports, and the fan on the top left hand side. Thanks to Gaming-Age for the screenshot. The image is from the Tokyo Game Show, early October, 1998.
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This image is from the Hong Kong gaming magazine, Game Weekly Vol. 2 #43, early November, 1998. This is the first picture to show the Dreamcast motherboard! Notice how clean looking the motherboard is! Very few chips, and a nice layout! Also notice the fan, with its passive heat collectors that sit on top of the PowerVR graphics chip and SH-4 CPU. A very unique and clever design! 
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All the parts that make up the Dreamcast unit.
Source: NoriPhd, Japanese site: PC Watch.
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Another screenshots showing all the parts that make up the Dreamcast.
Source: NoriPhd, Dreamcast Magazine #5
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Top down view, showing the GD-ROM drive, controller ports, fan and power supply.
Source: NoriPhd, Japanese site: PC Watch.
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The fan, which is located on the right hand side of the unit.
Source: NoriPhd, Japanese site: PC Watch.
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The unique heat sink, that absorbs heat from the Hitachi CPU, and the NEC/VideoLogic PowerVR Series2 graphics chip, which then conducts the heat to the fan. 
Source: NoriPhd, Japanese site: PC Watch.
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The motherboard showing the NEC/VideoLogic PowerVR Series2 graphics chip (biggest chip - 10 million transistors), Hitachi CPU (second biggest chip - 3.2 million transistors), Yamaha AICA sound system (two chips: ARM7 CPU ASIC and DSP), memory chips (NEC 100 MHz SDRAM x 2 - 64-bits access, Korean make 125 MHz SDRAM x 4 - 64-bits access, Korean make DRAM x 1) and the ROM device that contains the boot code, and the SEGA operating system. Notice the Katana name on the bottom of the board. Katana was one of the codenames of the Dreamcast, along with Dural, and Blackbelt.
Source: NoriPhd, Dreamcast Magazine #5
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The backside of the motherboard showing a very clean design.
Source: NoriPhd, Japanese site: PC Watch.
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How the motherboard looks sitting in the case. Object on the left hand side is the four controller ports.
Source: NoriPhd, Japanese site: PC Watch.
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The 33.6 Kb modem that comes with the Japanese Dreamcast.
Source: NoriPhd, Dreamcast Magazine #5
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The motherboard of the VMS (VMU) unit showing only a single chip that contains an 8-bit CPU, and 128 KBytes of FLASH memory. The great thing about FLASH memory is that even if the battery goes dead in the VMS unit, the contents of the memory does not get erased!
Source: NoriPhd, Dreamcast Magazine #5