Analysing the board layout led me to believe the board was probably powered by 3.3V, as there were regulators for 2.5V and 5V but not 3.3V as needed by the GBA zone. There were test points for the various voltage lines, including the line for the interface zone and lines for the GBA zone. The first thing I tackled was the power zone. The second is to take GBS-DOL out of the loop as well and hook up control, audio and video circuitry directly to the GBA CPU. The first is to emulate the Gamecube through the interface port with some kind of microcontroller.
There are two ways to achieving this that sprang to mind. Options for taking the Gamecube out of the loop In theory GBS-DOL emulates the screen, button and speaker circuitry, passing control inputs from the Gamecube and returning audio/visual data to be processed by the Gamecube.įinally the power zone regulates power to the interface and GBA zones. This area is dominated by the GBS-DOL chip which on one side connects to the Gamecube port and on the other to the pins of the GBA CPU. The interface takes up the job of communicating between the Gamecube and the GBA CPU. There also isn't a clock crystal directly connected to the CPU - more on this later. The board naturally lacks other normal GBA components such as the screen, buttons and speaker. There's a supporting SRAM chip, link port and of course the game slot. The CPU (marked CPU AGB A) on the bottom of the board is the same as the CPU in the original Gameboy Advance. At the back is the Gamecube connector/interface, at front right are various voltage regulators and lastly at front left is the CPU and ancillary components.
There are three main areas of interest on the board. They may not work if repeated on other board revisions. I've seen photos of boards marked DOL-GBS-01 and DOL-GBS-10 which are slightly different for this project I'll only be describing information and modifications for the DOL-GBS-20. Opening up the case revealed a single PCB, shielded with metal casing. It connected via the accessory port and a boot disc provided the software to allow the Gamecube to interface with it, providing control, video and audio output.įor my project I'm working with a European (UK) version. The Gameboy Player accessory allowed Gamecube owners to play Gameboy Advance, Gameboy Color and Gameboy games via their console.
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