Memory map

68000 address space

68000 address space overview
Address		Area
`$000000`	`$3FFFFF`	Cartridge slot
`$400000`	`$7FFFFF`	Expansion slot
`$A00000`	`$A0FFFF`	Z80 bus
`$A10000`	`$A10FFF`	I/O, etc.
`$A11000`	`$A11FFF`	Z80 bus control
`$A12000`	`$A120FF`	Expansion slot extra
`$A13000`	`$A130FF`	Cartridge slot extra
`$A14000`	`$A14FFF`	TMSS ports
`$C00000`	`$DFFFFF`	VDP
`$E00000`	`$FFFFFF`	Work RAM

VDP ports

Note: all VDP ports are mirrored every other word, e.g. control port is at both $C00004 and $C00006. This allows them to be accessed by longword (which the VDP will see as two word accesses).

PSG is normally accessed by byte, so you'll generally see $C00011 instead.

List of VDP ports
Address	Description
`$C00000`	VDP data port
`$C00004`	VDP control port
`$C00008`	VDP HV counter
`$C0000C`	VDP HV counter
`$C00010`	PSG port
`$C00014`	PSG port
`$C00018`	VDP debug address port
`$C0001C`	VDP debug data port

Accessing address range $C00020 to $C0003F hangs up.

VDP mirrors every $40 up to $DFFFFF.