Copy
cstore(dest_addr, src_addr, len, [filename]) -- copy bytes from ram to rom [load from filename; works with multi-cart export]
memcpy(dest_addr, src_addr, len) -- copy bytes
memset(dest_addr, val, len) -- set len bytes to val
peek(addr) -- read byte in ram address
poke(addr, val) -- write val in ram address
reload(dest_addr, src_addr, len, [filename]) -- copy bytes from rom to ram [load from filename; works with multi-cart export]

Copy
0x0    - gfx
0x1000 - gfx2/map2 (shared)
0x2000 - map
0x3000 - gfx_props
0x3100 - song
0x3200 - sfx
0x4300 - user data
0x5e00 - persistent cart data (256 bytes)
0x5f00 - draw state
0x5f40 - hardware state
0x5f80 - gpio pins (128 bytes)
0x6000 - screen (8k)