dump them when they're displayed... then write a tool to convert them to a format that is viewable... you'll have to know where they're located (start looking in 0x25C00000) by the way, you'll also have to know what format they're in (4bpp, 8bpp...) you can find out by taking a look at the command table stored in vdp1 vram (it's 34 bytes for every command table)