68k memory map

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Revision as of 15:27, 26 June 2011 by Furrtek (talk | contribs) (9 revisions: Import from wikkii)
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In Cartridge systems

Start address End address Size DEF Name Description
$000000 $0FFFFF 1MiB Vector table, First fixed bank of the 68k binary (P1 ROM)
$100000 $10F2FF 64KiB WORKRAM User RAM
$10F300 $10FFFF BIOS-reserved RAM
$200000 $2FFFFF 1MiB Second bank of the 68k binary (bankswitch possible on some carts, $2FFFE0 ?)
$300000 $3FFFFF Memory mapped registers
$400000 $401FFF 8KiB PALETTERAM Banked palette RAM
$800000 $801FFF 4 KiB MEMORYCARD Memory card (8bit, even bytes are always $FF)
$C00000 $C1FFFF 128KiB BIOSROM System's BIOS
$D00000 $D0FFFF 64KiB battery-backed RAM (MVS only)

In CD systems

Start address End address Size DEF Name Description
$000000 $1FFFFF 2MiB Vector table, 68k binaries (PRG files), 68k RAM
$100000 $10F2FF 64KiB
Shared with the 68k code DRAM ?
WORKRAM User RAM
$10F300 $10FFFF BIOS-reserved RAM
$200000 $2FFFFF ?
$300000 $3FFFFF 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 BIOSROM System's BIOS
$D00000 $DFFFFF ?
$E00000 $EFFFFF 1MiB UPLOAD Upload zone
$FF0000 $FF01FF ? CD system registers