Programming for the Gameboy/Hardware specifications

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Gameboy (Original) Gameboy Color
CPU 8-bit LR35902 @ 4.19MHz 8-bit LR35902 @ 4.19/8.38MHz
CPU Effective speed 1.0485 MHz 1.0485/2.097 MHz
Work RAM 8KiB 32 KiB (Banked, 8KiB immediate)
Video RAM 8KiB 16 KiB
Audio 2 Pulse wave generators, 1 PCM, 1 Noise generator, 1 cartridge audio line
Display colors 2-bit shades of gray 15-bit color
Display resolution 160 × 144 pixels
Inter-system communication Serial link Serial link, Infrared