Yamaha V9958

Yamaha V9958

Yamaha V9958(ceramic package)

The Yamaha V9958 is a Video Display Processor (VDP) used in MSX 80s home computers. More specifically, the MSX2+, MSX turbo R and the "TIM" upgrade to the TI-99/4A.

The Yamaha V9958, also known as MSX-Video, is the successor of the Yamaha V9938. It was clearly conceived not to be a very major upgrade to its predecessor, which hampered its adoption. The main new features are three graphical YJK modes (with up to 19268 colours) and horizontal scrolling registers.

Specifications

Video RAM: 128 KB + 64 KB of expanded VRAM
Text modes: 80 x 24 and 32 x 24
Resolution: 512 x 212 (4 or 16 colours out of 512) and 256 x 212 (16, 256, 12499 or 19268 colours)
Sprites: 32, 16 colours, max 8 per horizontal line
Hardware acceleration for copy, line, fill, etc.
Interlacing to double vertical resolution
Horizontal and vertical scroll registers

Detailed specifications

For detailed specifications, please refer to the Yamaha V9938 page, with the following additions:

Horizontal scrolling registers
YJK graphics modes (similar to YUV)
- G7 + YJK + YAE: 256 x 212, 12499 colours + 16 colour palette
- G7 + YJK: 256 x 212, 19268 colours
Ability to execute hardware accelerated commands in non-bitmap screen modes
Lightpen and mouse functions from V9938 were removed

MSX-specific terminology

On MSX, the screen modes are often referred to by their assigned number in MSX-Basic. This mapping is as follows:

Basic mode	VDP mode	MSX system
Screen 0 (width 40)	T1	MSX 1
Screen 0 (width 80)	T2	MSX 2
Screen 1	G1	MSX 1
Screen 2	G2	MSX 1
Screen 3	MC	MSX 1
Screen 4	G3	MSX 2
Screen 5	G4	MSX 2
Screen 6	G5	MSX 2
Screen 7	G6	MSX 2
Screen 8	G7	MSX 2
Screen 10	G7 with YJK and YAE	MSX 2+ and tR
Screen 11	G7 with YJK and YAE	MSX 2+ and tR
Screen 12	G7 with YJK	MSX 2+ and tR

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