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Yamaha V9958
From Wikipedia, the free encyclopedia
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The Yamaha V9958[1][2][3] is a Video Display Processor used in the MSX2+[4] and MSX turbo R series of home computers, as the successor to the Yamaha V9938 used in the MSX2, as well as the ‘TI Image Maker’ video expansion for the TI-99/4A home computer[5]. The main new features are three graphical YJK[6][7][8] modes with up to 19268 colors and horizontal scrolling registers. The V9958 was not as widely adopted as the V9938.
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Specifications
- Video RAM: 128 KB + 64 KB of expanded VRAM
- Text modes: 80 × 24 and 32 × 24
- Resolution: 512 × 212 (4 or 16 colors out of 512) and 256 × 212 (16, 256, 12499 or 19268 colors)
- Sprites: 32, 16 colors, max 8 per horizontal line
- Hardware acceleration for copy, line, fill, etc.
- Interlacing to double vertical resolution
- Horizontal and vertical scroll registers
Feature changes from the V9938
The following features were added to or removed from the Yamaha V9938 specifications:
- Added horizontal scrolling registers
- Added YJK graphics modes (similar to YUV):
- G7 + YJK + YAE: 256 x 212, 12499 colors + 16 color palette
- G7 + YJK: 256 × 212, 19268 colors
- Added the ability to execute hardware accelerated commands in non-bitmap screen modes
- Removed lightpen and mouse functions
- Removed composite video output function
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MSX-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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References
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