- Yamaha V9938
The Yamaha V9938 was a
Video Display Controller (VDC) used in theGeneve 9640 enhanced TI-99/4A clone, as well asMSX 80s home computers (more specifically, theMSX 2 ).The
Yamaha V9938 , also known as MSX-Video, is the successor of theTexas Instruments TMS9918 (used in the MSX1). The V9938 was in turn succeeded by theYamaha V9958 .pecifications
*
Video RAM : 64 KB to 128 KB
* Text modes: 80 x 24, 40 x 24 and 32 x 24
* Resolution: 512 x 212 (4 colours from 512) , 256 x 212 (16 colours from 512) and 256 x 212 (256 colours)
* Sprites: 32, 16 colours, max 8 per horizontal line
*Hardware acceleration for copy, line, fill, etc. Logical operations available.
*Interlacing to double vertical resolution
* Vertical scroll registerDetailed specifications
*
Video RAM : 128 kB
** Optionally 64 kB, in which case screen modes G6 and G7 are not available
** Optionally 192 kB, where 64 kB is extended-VRAM (only available as backbuffer for G4 and G5 modes)
* Clock: 21MHz
* Video output frequency: 15kHz
* Sprites: 32, 16 colours (1 per line), max 8 per horizontal line
*Hardware acceleration , with copy, line, fill etc. With or without logical operations.
* Vertical scroll register
* Capable of superimposition and digitization
* Resolution:
** Horizontal: 256 or 512
** Vertical: 192, 212, 384 (interlaced) or 424 (interlaced)
* Colour modes:
** Paletted RGB: 16 colours out of 512
** Fixed RGB: 256 colours
* Screen modes
** Text modes:
*** T1: 40 × 24 with 2 colours (out of 512)
*** T2: 80 × 24 with 4 colours (out of 512)
*** All text modes can have 26.5 rows as well.
** Pattern modes
*** G1: 256 × 192 with 16 paletted colours and 1 tables of 8×8 patterns
*** G2: 256 × 192 with 16 paletted colours and 3 table of 8×8 patterns
*** G3: 256 × 192 with 16 paletted colours and 3 tables of 8×8 patterns
*** MC: 64 × 48 with 16 paletted colours and 8×2 patterns
*** All modes with 192 lines can have 212 lines as well (similarly 48 → 53 in MC).
** Bitmap modes:
*** G4: 256 × 212 with 16 paletted colours
*** G5: 512 × 212 with 4 paletted colours
*** G6: 512 × 212 with 16 paletted colours
*** G7: 256 × 212 with 256 fixed-colours
*** All modes with 212 lines can have 192 lines as well (similarly 48 → 53 in MC).
*** All vertical resolutions can be doubled byinterlacing 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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