![]() Although, only bit manipulation instructions are found.įinally, they also added a few new instructions that are not present in either Z80 or 8080. Includes Z80’s extended instruction set.Only 8080’s set of registers are implemented.I’m not certain if that’s just a measure to reduce costs, but one thing for sure is that components will have to be completely memory-mapped. Neither of the Z80’s IX or IY registers nor 8080’s IN or OUT instructions are included: This means that I/O ports are not available.The Z80 is itself a superset of the 8080, so what does the SM83 actually has and has not from those two? Having said that, the main processor is a Sharp SM83 and it’s a mix between the Z80 and the Intel 8080. This type of chip is called ‘System On Chip’ (SoC) and the one found on the Game Boy is referred to as DMG-CPU or Sharp LR35902. ![]() ![]() Instead of placing many off-the-shelf chips on the motherboard, Nintendo opted for a single chip to house (and hide) most of the components, including the CPU. The Game Boy can be imagined as a portable version of the NES with limited power, but you’ll see that it included very interesting new functionality. Motherboard with important parts labelled Diagram Main architecture diagram Note that 'DMG' is the identifier of the original Game Boy model.
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