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DevelopmentSega Master System / Mark III / Game Gear |
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This page gives a fast reference to the memory maps of Sega 8-bit consoles. See other pages for more detailed information.
Region | Maps to |
---|---|
$0000-$bfff | Cartridge (ROM/RAM/etc) (or other attached hardware) |
$c000-$dfff | System RAM |
$e000-$ffff | System RAM (mirror) |
The "Cartridge" region is defined by the currently active cartridge, card or expansion device (where applicable). In nearly all cases, these correspond to ROM or on-cartridge RAM.
Region | Maps to |
---|---|
$0000-$03ff | ROM (unpaged) |
$0400-$3fff | ROM mapper slot 0 |
$4000-$7fff | ROM mapper slot 1 |
$8000-$bfff | ROM/RAM mapper slot 2 |
$c000-$dfff | System RAM |
$e000-$ffff | System RAM (mirror) |
$fff8 | 3D glasses control |
$fff9-$fffb | 3D glasses control (mirrors) |
$fffc | Cartridge RAM mapper control |
$fffd | Mapper slot 0 control |
$fffe | Mapper slot 1 control |
$ffff | Mapper slot 2 control |
Where control registers overlap with mirrored RAM, values written will affect the device and also be written to RAM. Reads simply return the value stored in RAM.
Region | Maps to |
---|---|
$0000-$bfff | Cartridge (ROM/RAM/etc) |
$c000-$c3ff | System RAM |
$c400-$ffff | System RAM (mirrored every 1KB) |
Cartridges may disable the system RAM and thus take over the full 64KB address space.