Sega 32X Handbuch Seite 15

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15
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.
When Power is on (ADEN = 0)
When using Super 32x (ADEN = 1)
Custom internal ROM
00 0000h
ROM Cartridge
00 0000h
Vector ROM
00 0000h
00h
88 0200h
04h
88 0206h
08h
88 020Ch
0Ch
FCh
100h
accessible
when RV =
1
40 0000h
See MD Manual
40 0000h
See MD Manual
84 0000h
Frame Buffer
86 0000h
Overwrite Image
88 0000h
ROM Cartridge
0000 0000h -
0007 FFFFh
4 bank
90 0000h
ROM Cartridge
00 0000h
(4 Bank Switch)
10 0000h
20 0000h
accessible when RV
= 0
30 0000h
A0 0000h
See MD Manual
40 0000h
A1 30ECh
Super 32X ID
A1 30ECh
Super 32X ID
"MARS
"
A1 30F0h
See MD Manual
A1 30F0h
See MD Manual
A1 5100h
Super 32X SYS REG
A1 5100h
Super 32X SYS REG
A1 5180h
See MD Manual
A1 5180h
VDP REG
A1 5200h
Color Palette
A1 5400h
See MD Manual
100 0000h
100 0000h
Figure 3.1 MEGA Drive Memory Map
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