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Topic: Texas Instruments SN76489

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	Texas Instruments SN76489 - Wikipedia, the free encyclopedia
		The SN76489 Programmable Sound Generator (PSG) is a TTL compatible four-channel sound chip from Texas Instruments.
		The frequency of the square waves produced at each channel is derived by two factors: the speed of the external clock and a value provided in a control register for that channel (called N).
		Each channel's frequency is arrived at by dividing the clock by 32 and then dividing the result by N. An SN76489 clone is included 'on-chip' in SEGA's Video Display Processors (VDP) for their Master System, Game Gear, and Mega Drive (Sega Genesis in North America), game consoles.
	en.wikipedia.org /wiki/SN76489 (182 words)

	Cogwheel.Org (Site not responding. Last check: 2007-11-03)
		The original Intellivision used a General Instruments PSG sound chip, the GI AY-3-8914.
		Part of a series of GI chips popular with game makers (including the AY-3-8910, 8912 and 8913, see above: the chips were used in the Sinclair ZX Spectrum, Amstrad CPC, BBC Micro, Atari ST, Sega Master System and many arcade machines), the 8914 had three tone generator channels and one white noise.
		Colecovision used a Texas Instrument SN76489 chip comparable to that of the Intellivision, but the 10-bit frequency divider limited tones to 1024 possible pitches.
	www.dullien-inc.com /collins/games/consoles.html (963 words)

	The SN76489 is a TTL TTL compatible 4 channel Programmable Sound... (Site not responding. Last check: 2007-11-03)
		The SN76489 is a TTL TTL compatible, 4 channel Programmable Sound Generator (PSG) IC from Texas Instruments Texas Instruments.
		The SN76489 is included 'on-chip' in SEGA's Video Display Processors (VDP) for their Master System Master System, Game Gear Game Gear, and Megadrive Megadrive (Sega Genesis Sega Genesis in North America North America), game consoles.
		The SEGA VDP is in fact based on the Texas Instruments TMS9918 TMS9918 VDP.
	www.biodatabase.de /SN76489 (214 words)

	Amstrad CPC - Open Encyclopedia
		The five-pin DIN connector is capable of driving a SCART television with a correctly wired lead.
		The CPC used the General Instruments AY-3-8912 sound chip, providing three channels, each configurable to generate square waves, white noise or both.
		Both use the Motorola 6845 video address generator and the two have very similar sound output chips - the General Instrument AY-3-8912 in the CPC provides three tone channels each optionally with added noise and the Texas Instruments SN76489 in the BBC offers three tone channels and one exclusive noise channel.
	www.openencyclopedia.net /index.php/Amstrad_CPC (3040 words)

	SMS Power! - Forums - View topic - Master System sound hardware details (Site not responding. Last check: 2007-11-03)
		The sound unit is a Texas Instruments SN76489 as seen in the Megadrive, BBC Micro and Colecovision, among others.
		In the case of the SMS, the sound circuit is located on the Texas Instruments TMS9918 Visual Data Processor, although the VDP and sound circuits are operationally separate.
		An instrument bank of 15 melody tones and 5 rhythm tones is available on ROM.
	www.smspower.org /forums/viewtopic.php?p=28588#28588 (1551 words)

	Texas Instruments SN76489: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-11-03)
		The SN76489 Programmable Sound Generator (PSG) is a TTL (Transistor-transistor logic (ttl) is a class of digital circuits built from bipolar junction transistors...)
		Each channel's frequency is arrived at by dividing the clock by 32 and then dividing the result by N. The SN76489 is included 'on-chip' in SEGA (Sega () is a video game software and hardware developer, and a former home computer...)
		The SEGA VDP is in fact based on the Texas Instruments TMS9918[for more, click this link] VDP.
	www.absoluteastronomy.com /ref/texas_instruments_sn764891 (574 words)

	yula.name Help you live. That such texas home equity loan. The complete information on questions texas home equity ... (Site not responding. Last check: 2007-11-03)
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		texas home equity loan - definition of texas home equity loan by the Free Online Dictionary, yula and Encyclopedia.
	yula.name /use/texas+home+equity+loan (63 words)

	General Instrument AY-3-8910 - (Site not responding. Last check: 2007-11-03)
		Image:AY-8912 Chip.jpgThe AY-3-8910 is a Programmable Sound Generator (PSG), 3-voice sound chip designed by General Instrument for 16-bit CP1610 or one of the PIC1650 series of 8-bit microcomputers.
		The 8910 and its variants were popular chips in many arcade games, and was used on, among others, the Intellivision and Vectrex video game consoles and the MSX, Atari ST, Amstrad CPC, Oric 1 and Sinclair ZX Spectrum+ 128 home computers as well as the Mockingboard sound card for the Apple II family.
		It produced very similar results to the Texas Instruments SN76489 and was on the market for a similar period.
	psychcentral.com /psypsych/wiki/AY-3-8912 (979 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		One of the advantages to the Colecovision's design is that all of those chips were quite common and widely used, making information about them a lot easier to come by than the relatively obscure General Instruments components used in the Intellivision.
		The SN76489 sound chip has plenty of signal-drive capability and doesn't need any impedance-matching circuitry, so its output can just go straight to the RCA jack which will be mounted on the back of the console.
		Unlike the Intellivision, it doesn't even need any capacitive coupling to filter out any DC components (though it probably couldn't hurt any if you feel like adding it anyway.) Take some shielded audio cable and solder the ground-shield to pin 8, and the signal lead to pin 7.
	lonestar.texas.net /~solarfox/colecoav_p2.htm (397 words)

	1day.us Help you live. That such texas home loan. The complete information on questions texas home loan... (Site not responding. Last check: 2007-11-03)
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	1day.us /use/texas+home+loan (58 words)

	[No title]
		All versions of the VDP also have a Texas Instruments SN76489 sound chip built in.
		It is identical to the stand-alone version of the same chip, so I won't discuss how it works beyond what VDP ports it is mapped to.
		The Game Gear has a modified PSG, where each of the four channels (three tone and one noise) can be output through the left or right speakers by a stereo control register mapped to Z80 I/O port $06.
	cgfm2.emuviews.com /txt/msvdp.txt (5526 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		The MSX contains a different sound chip that is very similar in capabilities, the General Instruments AY-3-8910.
		The result of this is that the YM2413 can only play one user-defined instrument at a time; the other 15 instrument settings are hard-coded and cannot be altered by the user.
		There were other cost-cutting modifications: the number of waveforms was reduced to...
	www.worldhistory.com /wiki/S/SG-1000.htm (608 words)

	Sega Mega Drive/Sega Genesis - Wikipedia, the free encyclopedia
		Secondary sound chip: Texas Instruments SN76489 compatible device built into VDP.
		In order to achieve backwards compatibility, the original Master System central processor and sound chip (the Z80 and SN76489) are included in the Mega Drive/Genesis and the new Video Display Processor is capable of the Master System VDP's mode 4 (though it cannot run in modes 0, 1, 2, or 3).
		Once an 8-bit game is inserted, the system's bus controller chip (later integrated with the I/O chip into a single multi-purpose ASIC) will put the Z80 in control leaving the 68000 idle.
	en.wikipedia.org /wiki/Sega_Genesis (5561 words)

	Sound generators of the 1980s home computers
		The TI SN76489 Digital Complex Sound Generator has very similar specifications to the GI PSG.
		Because of Sega's backwards compatibility, this meant that there were TI SN76489 cores in later machines from the Mark III and Master System to the Mega Drive, although they were integrated into video chips.
		The envelope settings for the drum sounds are also preset, and some of the controls have fewer bits of precision than the previous chips.
	www.srcf.ucam.org /~rga24/computer/music (2001 words)

	Sound chips
		The AY-3-8910 is a 3-voice sound chip designed by General Instrument.
		The SPC700 chip was very advanced for its time (1991) and may in some ways be said to rival today's wavetable synthesizer sound cards.
		There were other cost-cutting modifications: the number of waveforms was reduced to two, and an adder is not used to mix the channels; instead, the chip's DAC plays each channel one after the other, and the output of this is usually passed through an analog filter.
	www.shortopedia.com /S/O/Sound_chips (1127 words)

	adamdawes.com - Retro Gaming
		The original Spectrum computers as we all know could only produce a simple monotone beep, so these were never going to compete with the aural capabilities of the SID chip.
		The Amstrad computers (and also the later 128K versions of the Spectrum) were fitted with a General Instruments AY-3-8912 sound chip, and the BBC with a Texas Instruments SN76489 chip.
		Both of these chips were capable of producing three channels of sound plus an additional channel of white noise.
	www.adamdawes.com /retrogaming/rg_04_pias.html (4431 words)

	[No title]
		Since only address zero is documented as valid, it could be that the other addresses may return an incorrect result in some situations.
		- The PSG is compatible with the Texas Instruments SN76489.
		It is actually on the same physical chip as the VDP, and it's output comes directly out of the VDP to be mixed with the YM2612.
	cgfm2.emuviews.com /txt/gen-hw.txt (2832 words)

	Facts about sega master system (Site not responding. Last check: 2007-11-03)
		The failure of the SMS meant the success of the Megadrive and Genesis.
		Graphics: Texas Instruments TMS9918 derived VDP (Video Display Processor)
		Sound: Texas Instruments SN76489 4 channel mono sound
	www.supercrawler.com /Facts/sega_master_system.html (830 words)

	a1k0n: ColecoVision A/V jacks
		It's a Texas Instruments SN76489AN located near the center of the motherboard.
		Pin 7 is the audio output, and, conveniently, pin 8 is ground.
		The RCA cable from the audio chip goes right to the RCA jack (the SN76489 will drive up to 10mA).
	www.a1k0n.net /blah/articles/colecovision/index.html (834 words)

	[No title]
		These machines can be viewed as the first steps to the creation of the MSX standard.
		The ColecoVision and Sega SG-1000 consoles have the same CPU and Video Display Processor (VDP) than the MSX1 machines; they use the Texas Instrument SN76489 sound chip, that is very close to the Programmable Sound Generator (PSG) of the MSX1 machines.
		In the SVI318/328 computers, CPU, VDP and PSG are the same than in the MSX1 machines ; the SVI-BASIC is very close to the MSX-BASIC.
	www.msxblue.com /manual/msxsystem_c.htm (220 words)

	1 question will the psp be as powerful as the PS2 - Xbox 360 & Xbox Forums
		Derived from the Texas Instruments TSM9918/9928 line of video display processors.
		Derived from the Texas Instruments SN76489 programmable sound generator.
		The Programmable Sound Generator is discussed in Chapter 6: The Programmable Sound Generator (PSG).
	forum.teamxbox.com /showthread.php?t=241119 (1182 words)

	history
		I'm beta testing Neil Bradley's excellent MZ80 engine which is needed for the sound emulation.
		Once I've added in the changes required to get two CPU emulations running at the same time I can start doing the emulation of the SN76489 which is the primary music chip, then it's onto the sample playback.
		If anyone has a datasheet on the Texas Instruments SN76489 or SN76496, I'd love to have a look at it.
	www.junofirst.freeserve.co.uk /history.htm (758 words)

	ECN - November/December 1987
		The Video Display Processor, a Texas Instruments (TI) 9928, generates all video, control and synchronization signals and controls the storage, retrieval and refresh of display data in dynamic memory, VRAM.
		The 9928 uses a table-driven architecture that allows the programmer to control every pixel in the visual display area, and to define and control 32 "sprites." Sprintes may be placed anywhere on the display and moved at will.
		The R-Y, B-Y, and Y signals from the VDP, along with the 3.58 MHz clock and the audio signal from the SN76489 (6496), are provided to the RF modulator to produce the composite video output.
	www.sacnews.net /adamcomputer/23.html (3750 words)

	New TurboGrafx-16 Site Launches - AtariAge Forums
		The SEGA Genesis video and audio system was an evolution of the SEGA Master System Video Display Processor (VDP) which in turn was based on the Texas Instruments TMS9918 VDP and the SN76489 for audio.
		The Atari ST had a bitmapped based graphics system and a General Instruments AY-3-8910 compatible sound chip.
		I don't know the details of the Atari patent infringement case with SEGA but I've heard it was just about the 2600 'compatible' controllers.
	www.atariage.com /forums/index.php?showtopic=63898 (659 words)

	MAWS - MAME source (Site not responding. Last check: 2007-11-03)
		/************************************************************************* sn76496.c Routines to emulate the Texas Instruments SN76489** / SN76496 programmable tone /noise generator.
		Also known as (or at least compatible with) TMS9919.
		It can be set for either period or white noise; again, the details are unknown.
	www.mameworld.net /maws/mamesrc/src/sound/sn76496.c (459 words)

	[No title]
		Also he helped me to discover problems in my timing routines.
		Maxim created the best document about SN76489 sound generator.
		strange VDP behaviours and all necessary information to complement official TMS9918 Datasheet from Texas Instruments.
	imperiopso.brinkster.net /sayarx/eng/abou.htm (327 words)

	Sega Mega Drive: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-11-03)
		which in turn is derived from the Texas Instruments (Texas instruments, better known in the electronics industry as ti, is a company based in dallas, texas,...)
		Used in Sonic 2[for more facts and a summary of this subject, click this link] for two-player split screen
		Main sound chip: Yamaha YM2612[for more facts and a summary of this subject, click this link] six-channel FM Additional sound chip: Texas Instruments SN76489[for more info, click this link] four-channel PSG (Programmable Sound Generator)
	www.absoluteastronomy.com /ref/sega_mega_drive (5925 words)

	Alive 12 - smsplus
		# Graphics: VDP (Video Display Processor) - Derived from Texas Instruments
		Up to 32 simultaneous colors available (16 for sprites, 16 for background) from a palette of 64 (can also show 64 simultaneous colors using programming tricks.) Screen resolutions 256x192 and 256x224.
		# Sound (PSG): Texas Instruments SN76489 - 4 channel mono sound
	alive.atari.org /alive12/smsplus.php (1274 words)

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