Yamaha V9958: Difference between revisions

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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. The main new features are three graphical YJK^[5]^[6]^[7] modes with up to 19268 colors and horizontal scrolling registers. The V9958 was not as widely adopted as the V9938.

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 colors out of 512) and 256 x 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 x 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

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

References

^ IC Master. United Technical Publications. 2001.
^ Martín Sesma, Sergio (2016-10-03). Arqueología informática: los ordenadores MSX en los inicios de la microinformática doméstica (Proyecto/Trabajo fin de carrera/grado thesis). Universitat Politècnica de València.
^ Redazione (2008-10-20). "MSX - Vari Costruttori- 1983". CyberLudus.com (in Italian). Retrieved 2022-11-13.
^ Alex, Wulms (1995). "Schermen op MSX - De 2+ schermen" (PDF). MSX Computer & Club Magazine (72).
^ MSX Licensing Corporation (2022). "The YJK screen modes". MSX Assembly Page.
^ Niemietz, Ricardo Cancho (2014). Issues on YJK colour model implemented in Yamaha V9958 VDP chip (PDF).
^ "VCFe Vortrag vom 2016.04.30 - Homecomputer und Spielkonsolen - Videoarchitekturen als visuelles Medium". neil.franklin.ch. Retrieved 2022-11-13.

[1] IC Master. United Technical Publications. 2001.

[2] Martín Sesma, Sergio (2016-10-03). Arqueología informática: los ordenadores MSX en los inicios de la microinformática doméstica (Proyecto/Trabajo fin de carrera/grado thesis). Universitat Politècnica de València.

[3] Redazione (2008-10-20). "MSX - Vari Costruttori- 1983". CyberLudus.com (in Italian). Retrieved 2022-11-13.

[4] Alex, Wulms (1995). "Schermen op MSX - De 2+ schermen" (PDF). MSX Computer & Club Magazine (72).

[5] MSX Licensing Corporation (2022). "The YJK screen modes". MSX Assembly Page.

[6] Niemietz, Ricardo Cancho (2014). Issues on YJK colour model implemented in Yamaha V9958 VDP chip (PDF).

[7] "VCFe Vortrag vom 2016.04.30 - Homecomputer und Spielkonsolen - Videoarchitekturen als visuelles Medium". neil.franklin.ch. Retrieved 2022-11-13.

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 [[Image:V9958 02.jpg|thumb|right|300px|Yamaha V9958 in ceramic package]]
-The '''Yamaha V9958'''<ref>{{Cite book |url=https://books.google.com/books?id=8RwSAQAAMAAJ&dq=%22Yamaha+V9958%22+-wikipedia&pg=PA3984 |title=IC Master |date=2001 |publisher=United Technical Publications |language=en}}</ref><ref>{{Cite thesis |title=Arqueología informática: los ordenadores MSX en los inicios de la microinformática doméstica |url=https://riunet.upv.es/handle/10251/70909 |publisher=Universitat Politècnica de València |date=2016-10-03 |degree=Proyecto/Trabajo fin de carrera/grado |first=Sergio |last=Martín Sesma}}</ref><ref>{{Cite web |last=Redazione |date=2008-10-20 |title=MSX - Vari Costruttori- 1983 |url=https://www.cyberludus.com/2008/10/msx-vari-costruttori-1983/ |access-date=2022-11-13 |website=CyberLudus.com |language=it-IT}}</ref> is a [[Video Display Processor]] used in the [[MSX2+]]<ref>{{Cite journal |last=Alex |first=Wulms |date=1995 |title=Schermen op MSX - De 2+ schermen |url=http://www.msxarchive.nl/pub/msx/mirrors/hanso/hwdoityourself/msxplus.pdf |journal=MSX Computer & Club Magazine |issue=72}}</ref> and [[MSX turbo R]] series of home computers and the "TIM" upgrade to the [[TI-99/4A]]. Also known as the MSX-Video chip,<ref>{{Cite book |url=http://map.grauw.nl/resources/video/yamaha_v9958_ocr.pdf |title=V9958 MSX-Video Technical data book |publisher=Yamaha |year=1988}}</ref> it is the successor to the [[Yamaha V9938]]. The main new features are three graphical [[YJK]]<ref>{{Cite web |last=MSX Licensing Corporation |date=2022 |title=The YJK screen modes |url=http://map.grauw.nl/articles/yjk/ |website=MSX Assembly Page}}</ref><ref>{{Cite book |last=Niemietz |first=Ricardo Cancho |url=http://rs.gr8bit.ru/Documentation/Issues-on-YJK-colour-model-implemented-in-Yamaha-V9958-VDP-chip.pdf |title=Issues on YJK colour model implemented in Yamaha V9958 VDP chip |year=2014}}</ref><ref>{{Cite web |title=VCFe Vortrag vom 2016.04.30 - Homecomputer und Spielkonsolen - Videoarchitekturen als visuelles Medium |url=http://neil.franklin.ch/Articles/20160430_VCFe_Video_als_Medium.html |access-date=2022-11-13 |website=neil.franklin.ch}}</ref> modes with up to 19268 colors and horizontal scrolling registers. The V9958 was not as widely adopted as the V9938.
+The '''Yamaha V9958'''<ref>{{Cite book |url=https://books.google.com/books?id=8RwSAQAAMAAJ&dq=%22Yamaha+V9958%22+-wikipedia&pg=PA3984 |title=IC Master |date=2001 |publisher=United Technical Publications |language=en}}</ref><ref>{{Cite thesis |title=Arqueología informática: los ordenadores MSX en los inicios de la microinformática doméstica |url=https://riunet.upv.es/handle/10251/70909 |publisher=Universitat Politècnica de València |date=2016-10-03 |degree=Proyecto/Trabajo fin de carrera/grado |first=Sergio |last=Martín Sesma}}</ref><ref>{{Cite web |last=Redazione |date=2008-10-20 |title=MSX - Vari Costruttori- 1983 |url=https://www.cyberludus.com/2008/10/msx-vari-costruttori-1983/ |access-date=2022-11-13 |website=CyberLudus.com |language=it-IT}}</ref> is a [[Video Display Processor]] used in the [[MSX2+]]<ref>{{Cite journal |last=Alex |first=Wulms |date=1995 |title=Schermen op MSX - De 2+ schermen |url=http://www.msxarchive.nl/pub/msx/mirrors/hanso/hwdoityourself/msxplus.pdf |journal=MSX Computer & Club Magazine |issue=72}}</ref> and [[MSX turbo R]] series of home computers, as the successor to the [[Yamaha V9938]] used in the MSX2. The main new features are three graphical [[YJK]]<ref>{{Cite web |last=MSX Licensing Corporation |date=2022 |title=The YJK screen modes |url=http://map.grauw.nl/articles/yjk/ |website=MSX Assembly Page}}</ref><ref>{{Cite book |last=Niemietz |first=Ricardo Cancho |url=http://rs.gr8bit.ru/Documentation/Issues-on-YJK-colour-model-implemented-in-Yamaha-V9958-VDP-chip.pdf |title=Issues on YJK colour model implemented in Yamaha V9958 VDP chip |year=2014}}</ref><ref>{{Cite web |title=VCFe Vortrag vom 2016.04.30 - Homecomputer und Spielkonsolen - Videoarchitekturen als visuelles Medium |url=http://neil.franklin.ch/Articles/20160430_VCFe_Video_als_Medium.html |access-date=2022-11-13 |website=neil.franklin.ch}}</ref> modes with up to 19268 colors and horizontal scrolling registers. The V9958 was not as widely adopted as the V9938.
 ==Specifications==