| Start address |
End address |
Description |
32X SH-2 address
|
| $000000
|
$3FFFFF
|
Cartridge ROM/RAM
|
$2000000-$23FFFFF
|
| $400000
|
$7FFFFF
|
Reserved (used by the Mega-CD and 32X)
|
| $800000
|
$9FFFFF
|
Reserved (used by the 32X)
|
| $840000
|
$85FFFF
|
32X frame buffer
|
$4000000-$401FFFF
|
| $860000
|
$87FFFF
|
32X frame buffer overwrite mode
|
$4020000-$403FFFF
|
| $880000
|
$8FFFFF
|
32X cartridge ROM (first 512kB bank only)
|
| $900000
|
$9FFFFF
|
32X cartridge bankswitched ROM (any 512kB bank, controlled by 32X registers)
|
| $A00000
|
$A0FFFF
|
Z80 memory space
|
| $A10000
|
$A10001
|
Version register
|
| $A10002
|
$A10003
|
Controller 1 data
|
| $A10004
|
$A10005
|
Controller 2 data
|
| $A10006
|
$A10007
|
Expansion port data
|
| $A10008
|
$A10009
|
Controller 1 control
|
| $A1000A
|
$A1000B
|
Controller 2 control
|
| $A1000C
|
$A1000D
|
Expansion port control
|
| $A1000E
|
$A1000F
|
Controller 1 serial transmit
|
| $A10010
|
$A10011
|
Controller 1 serial receive
|
| $A10012
|
$A10013
|
Controller 1 serial control
|
| $A10014
|
$A10015
|
Controller 2 serial transmit
|
| $A10016
|
$A10017
|
Controller 2 serial receive
|
| $A10018
|
$A10019
|
Controller 2 serial control
|
| $A1001A
|
$A1001B
|
Expansion port serial transmit
|
| $A1001C
|
$A1001D
|
Expansion port serial receive
|
| $A1001E
|
$A1001F
|
Expansion port serial control
|
| $A10020
|
$A10FFF
|
Reserved
|
| $A11000
|
Memory mode register
|
| $A11002
|
$A110FF
|
Reserved
|
| $A11100
|
$A11101
|
Z80 bus request
|
| $A11102
|
$A111FF
|
Reserved
|
| $A11200
|
$A11201
|
Z80 reset
|
| $A11202
|
$A12FFF
|
Reserved
|
| $A13000
|
$A130FF
|
TIME registers; used to send signals to the cartridge
|
| $A130EC
|
$A130EF
|
"MARS" when 32X is attached
|
| $A130F1
|
SRAM access register
|
| $A130F3
|
Bank register for address $80000-$FFFFF
|
| $A130F5
|
Bank register for address $100000-$17FFFF
|
| $A130F7
|
Bank register for address $180000-$1FFFFF
|
| $A130F9
|
Bank register for address $200000-$27FFFF
|
| $A130FB
|
Bank register for address $280000-$2FFFFF
|
| $A130FD
|
Bank register for address $300000-$37FFFF
|
| $A130FF
|
Bank register for address $380000-$3FFFFF
|
| $A14000
|
$A14003
|
TMSS "SEGA"
|
| $A14101
|
TMSS/cartridge register
|
| $A14102
|
$BFFFFF
|
Reserved
|
| $C00000
|
$C00001
|
VDP data port
|
| $C00002
|
$C00003
|
VDP data port (mirror)
|
| $C00004
|
$C00005
|
VDP control port
|
| $C00006
|
$C00007
|
VDP control port (mirror)
|
| $C00008
|
$C00009
|
VDP H/V counter
|
| $C0000A
|
$C0000F
|
VDP H/V counter (mirror)
|
| $C00011
|
PSG output
|
| $C00013
|
$C00017
|
PSG output (mirror)
|
| $C0001C
|
$C0001D
|
Debug register
|
| $C0001E
|
$C0001F
|
Debug register (mirror)
|
| $C00020
|
$FEFFFF
|
Reserved
|
| $FF0000
|
$FFFFFF
|
68000 RAM
|