Difference between revisions of "Sega Mega Drive/Memory map"
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| − | {| | + | {|class="prettytable" |
! Start address || End address || Description || 32X SH-2 address | ! Start address || End address || Description || 32X SH-2 address | ||
|- | |- | ||
| Line 27: | Line 27: | ||
| $880000 | | $880000 | ||
| $8FFFFF | | $8FFFFF | ||
| − | | 32X cartridge ROM | + | | 32X cartridge ROM (first 512kB bank only) |
|-style="background:lightyellow" | |-style="background:lightyellow" | ||
| $900000 | | $900000 | ||
| $9FFFFF | | $9FFFFF | ||
| − | | 32X cartridge bankswitched ROM | + | | 32X cartridge bankswitched ROM (any 512kB bank, controlled by 32X registers) |
|- | |- | ||
| $A00000 | | $A00000 | ||
| Line 125: | Line 125: | ||
|- | |- | ||
| $A11202 | | $A11202 | ||
| − | | $ | + | | $A12FFF |
| Reserved | | Reserved | ||
| + | |- | ||
| + | | $A13000 | ||
| + | | $A130FF | ||
| + | | TIME registers; used to send signals to the cartridge | ||
| + | |- | ||
| + | | $A130EC | ||
| + | | $A130EF | ||
| + | | "MARS" when 32X is attached | ||
| + | |- | ||
| + | |colspan=2| $A130F1 | ||
| + | | [[Sega Mega Drive/SRAM|SRAM access register]] | ||
| + | |- | ||
| + | |colspan=2| $A130F3 | ||
| + | | [[Sega Mega Drive/Bank switching|Bank register]] for address $80000-$FFFFF | ||
| + | |- | ||
| + | |colspan=2| $A130F5 | ||
| + | | Bank register for address $100000-$17FFFF | ||
| + | |- | ||
| + | |colspan=2| $A130F7 | ||
| + | | Bank register for address $180000-$1FFFFF | ||
| + | |- | ||
| + | |colspan=2| $A130F9 | ||
| + | | Bank register for address $200000-$27FFFF | ||
| + | |- | ||
| + | |colspan=2| $A130FB | ||
| + | | Bank register for address $280000-$2FFFFF | ||
| + | |- | ||
| + | |colspan=2| $A130FD | ||
| + | | Bank register for address $300000-$37FFFF | ||
| + | |- | ||
| + | |colspan=2| $A130FF | ||
| + | | Bank register for address $380000-$3FFFFF | ||
|- | |- | ||
| $A14000 | | $A14000 | ||
| $A14003 | | $A14003 | ||
| − | | [[TMSS|TMSS | + | | [[TMSS]] "SEGA" |
| + | |- | ||
| + | |colspan="2"| $A14101 | ||
| + | | [[TMSS]]/cartridge register | ||
|- | |- | ||
| − | | $ | + | | $A14102 |
| $BFFFFF | | $BFFFFF | ||
| Reserved | | Reserved | ||
| Line 184: | Line 219: | ||
|} | |} | ||
| − | [[Category: | + | [[Category:Mega Drive technical information|Memory map]] |
| − | |||
Latest revision as of 13:25, 1 August 2021
| 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 | |