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Showing posts from February, 2011

GameBoy (Classic) Work In Progress Part 4

I finally dug the GameBoy back out of the project box and started making some more progress on it. I'm still working with an ATMega32, but now I've cranked it up to the full 16Mhz it can handle... I also took some new data from the GameBoy LCD control signals with the Logic Sniffer. This time I wasn't clocking the GameBoy with my micro-controller. Instead I used the GBs original crystal, so the data is from the actual signals with actual timing that the GameBoy uses. I was able to break down the timings of the signals and essentially emulate them with the ATMega32. The logic I use to determine what pixel data to push out was simply if(x = y) then the pixel was turned on. I figure a diagonal line is a good test that doesn't look like the crazy vertical and horizontal screen artifacts you sometimes get with the GB. This picture is very deceiving, the contrast is a lot better in the picture than on the actual screen. The ATMega32 can't quite outpu