The Yamaha V9938 is a Video Display Processor (VDP) used on the MSX 2 home computer, as well as on the Geneve 9640 enhanced TI-99/4A clone.
The Yamaha V9938, also known as MSX-Video or VDP (Video Display Processor), is the successor of the Texas Instruments TMS9918 (used in the MSX1 and various other systems). The V9938 was in turn succeeded by the Yamaha V9958.
Read more about Yamaha V9938: Specifications, MSX-specific Terminology