MarketYamaha V9938
Company Profile

Yamaha V9938

The Yamaha V9938, also known as MSX-Video or VDP , is a video display processor (VDP) used on the MSX2 home computer, as well as on the Geneve 9640 enhanced TI-99/4A clone, and the Tatung Einstein 256. It was also used in a few MSX1 computers, in a configuration with 16kB VRAM. It was also used in the Zemmix V console.

Specifications
Video RAM: 16–192 KB • Text modes: 80 × 24, 40 × 24 and 32 × 24 • Resolution: 512 × 212 (16 colors from 512), 256 × 212 (16 colors from 512) and 256 × 212 (256 colors) • Sprites: 32, 16 colors, max 8 per horizontal line • Hardware acceleration for copy, line, fill and logical operations available • Interlacing to double vertical resolution • Vertical scroll register Detailed specificationsVideo RAM: 4 possible configurations • 16 KB (modes G4 up to G7 will not be available) • 64 KB (modes G6 and G7 will not be available) • 128 KB: most common configuration • 192 KB, where 64 KB is extended-VRAM (only available as back-buffer for G4 and G5 modes) • Clock: 21 MHz • Video output frequency: 15 kHz • Color encoding: Software switchable between 50 Hz and 60 Hz modes • Sprites: 32, 16 colors (1 per line. 3, 7 or 15 colors/line by using the CC attribute), 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 • Support for connecting a lightpen and a mouseResolution: • Horizontal: 256 or 512 • Vertical: 192p, 212p, 384i or 424i • Color modes: • Paletted RGB: 16 colors out of 512 (9-bit RGB) • Fixed RGB: 256 colors (3-3-2 bit RGB) • Screen modes • Text modes: • T1: 40 × 24 with 2 colors (out of 512) • T2: 80 × 24 with 4 colors (out of 512) • All text modes can have 26.5 rows as well. • Pattern modes • G1: 256 × 192 with 16 paletted colors and 1 table of 8×8 patterns • G2: 256 × 192 with 16 paletted colors and 3 tables of 8×8 patterns • G3: 256 × 192 with 16 paletted colors and 3 tables of 8×8 patterns • MC: 64 × 48 with 16 paletted colors 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 colors • G5: 512 × 212 with 4 paletted colors • G6: 512 × 212 with 16 paletted colors • G7: 256 × 212 with 256 fixed-colors • All modes with 212 lines can have 192 lines as well (similarly 48 → 53 in MC) • All vertical resolutions can be doubled by interlacing ==MSX-specific terminology==
MSX-specific terminology
On MSX, the screen modes are often referred to by their assigned number in MSX-Basic. This mapping is as follows: == References ==
tickerdossier.comtickerdossier.substack.com