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1.4. Mapping
The 32x hardware can be controlled from both the main CPU SH2 and MEGA Drive
68000. As stated in the last chapter, the layout of each block in the address space of both
CPUs is explained here.
MEGA Drive Memory Map
In using the 32X, the exclusive initial program provided by SEGA is laid out cartridge
ROM of 3FAh or more and jumped by the reset vector. To map the 32X in 68000 address
space, this program sets the ADEN (address enable) bit to 1, initializes the hardware, and
executes the application. The figure below shows the 68000 address space immediately
after the power is turned on and the initial program executed.
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