- Yamaha V9958
The Yamaha V9958 is a
Video Display Controller (VDC) used inMSX 80s home computers. More specifically, the "TIM" upgrade to theTI-99/4A , MSX 2+ andMSX turbo R .The Yamaha V9958, also known as MSX-Video, is the successor of the
Yamaha V9938 (used in the MyarcGeneve 9640 upgrade for theTI-99/4A and theMSX2 ). It was generally 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.pecifications
*
Video RAM : 128 KB + 64 KB of expanded VRAM
* Text modes: 80 x 24 and 32 x 24
* Resolution: 512 x 212 (16 colours out of 512) and 256 x 212 (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 registersDetailed specifications
For detailed specifications, please refer to the
Yamaha V9938 page, with the following additions:* Horizontal scrolling registers
*YJK graphics modes (similar toYUV )
** 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
* Mouse andtrackball functions from V9938 were removedMSX-specific terminology
On MSX, the screen modes are often referred to by their assigned number in MSX-Basic. This mapping is as follows:
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