68k memory map

In Cartridge systems Start End Size DEF Name Description $000000 $0FFFFF 1MiB Vector table, First fixed bank of the 68k program ROM (P ROM) $100000 $10F2FF 64KiB WORKRAM User RAM $10F300 $10FFFF BIOS-reserved RAM $200000 $2FFFFF 1MiB Second bank of the 68k program ROM (used for bankswitching and special chips) $300000 $39FFFF Input ports (See Memory mapped registers) $3A0000 $3BFFFF Ouput ports (See Memory mapped registers) $3C0000 $3FFFFF GPU ports (See Memory mapped registers) $400000 $401FFF 8KiB PALETTERAM Banked palette RAM $800000 $BFFFFF 16 KiB max MEMORYCARD Memory card (8bit, even bytes are always $FF) $C00000 $C1FFFF 128KiB BIOSROM System ROM (BIOS) $D00000 $D0FFFF 64KiB battery-backed RAM (MVS only)

In CD systems Start End Size DEF Name Description $000000 $0FFFFF 2MiB Vector table, 68k program (PRG files), 68k RAM $100000 $10F2FF 64KiB Shared with the 68k code DRAM ? WORKRAM User RAM $10F300 $10FFFF BIOS-reserved RAM $110000 $1FFFFF 68k program ? $300000 $39FFFF Input ports (See Memory mapped registers) $3A0000 $3BFFFF Ouput ports (See Memory mapped registers) $3C0000 $3FFFFF GPU ports (See Memory mapped registers) $400000 $401FFF 8KiB PALETTERAM Banked palette RAM $800000 $803FFF 8 KiB MEMORYCARD Virtual memory card (onboard battery-backed RAM) (8bit, even bytes are always $FF) $C00000 $C7FFFF 512KiB SYSTEMROM System ROM (BIOS) $D00000 $DFFFFF ? $E00000 $EFFFFF 1MiB UPLOAD Upload zone $FF0000 $FF01FF ? CD specific i/o registers