Sega Genesis

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Hardware Specifications

CPU

Main processor: Motorola 68000 (or equivalent)

  • Runs at 7.61 MHz in PAL consoles, 7.67 MHz in NTSC consoles.
  • This is based on a quotient of one crystal based on the NTSC/PAL color carrier frequency (3.58 MHz for NTSC, 3.55 MHz for PAL). All frequencies in the Sega Genesis are derived from this frequency as it simplified glue logic and allowed the Genesis to make do with a single cheap mass-produced crystal.


Second CPU (Audio Controller)

  • Runs at 3.55 MHz in PAL consoles, 3.58 MHz in NTSC consoles
  • Used as main CPU in Master System compatibility mode.


Memory

  • Boot ROM: 2 KB
  • Main RAM: 64 KBytes
  • Video RAM: 64 KBytes
  • Secondary RAM: 8 KBytes
  • Audio RAM: 8 KBytes

Cartridge memory area:

  • Up to 4 MBytes (32 Megabits)
  • Part of M68000 address space
  • Game cartridges larger than 4 MBytes must use bank switching




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List of submitted modifications

Upgrade the CPU in your Sega Genesis/Mega Drive

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