• VDP Screen Modes
• V9938 Screen Modes
• Mode 0 (Text 40x24)
• Mode 1 (Text 32x24)
• Mode 2 (Text 32x24, Graphics 256x192)
• Mode 3 (Multicolour, graphics 64x48)
• Mode 1_2 (mangled mode)
• Removing code for unused screen modes
• Raster interrupt
• Firmware implementation