Some notes about the memory layout.

• 0x5f00—0x5f10: draw palette
• 0x5f10—0x5f20: screen palette
• 0x5f20—0x5f24: clipping region
• 0x5f24: ?
• 0x5f25: pen color
• 0x5f26: cursor X
• 0x5f27: cursor Y
• 0x5f28—0x5f2c: camera
• 0x5f2c: screen mode
  • 0: ×ばつ128 (standard)
  • 1: ×ばつ128
  • 2: ×ばつ64
  • 3: ×ばつ64
  • 5: mirror X
  • 6: mirror Y
  • 7: mirror X,Y
• 0x5f2d: mouse support
• 0x5f31—0x5f34: fill pattern