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Topic: Motorola 6845

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	Motorola 6845 - Wikipedia, the free encyclopedia
		The Motorola 6845 (commonly MC6845) is a video address generator first introduced by Motorola and used in the CGA and EGA video adapters, Amstrad CPC and BBC Micro.
		The 6845 generates the signals necessary to interface with a raster display but does not display any pixels.
		This is useful for light pens and light guns which can function by pulsing the 6845 when the electron beam passes, allowing a running program to read back the location pointed at.
	en.wikipedia.org /wiki/Motorola_6845 (852 words)

	Motorola 6845 (Site not responding. Last check: 2007-10-20)
		The MC6845 was a video address generator first introduced by Motorola and used in the CGA and EGA video adapters, Amstrad CPC and BBC Micro.
		The 6845 generates the signals necessary to interface with a raster display does not actually display any pixels.
		The net effect of this is that the 6845 is not ordinarily able to provide a linear framebuffers.
	www.worldhistory.com /wiki/M/Motorola-6845.htm (655 words)

	Amstrad CPC - Wikipedia, the free encyclopedia
		In particular the CPC lacks the colour clash of the ZX Spectrum and clever programming of the 6845 could produce overscan, different resolutions (although with the same pixel density) and smooth pixel scrolling.
		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.
		Simple reprogramming of the Motorola 6845 CRTC could produce extended graphics modes up to 784×384 pixels through overscan.
	en.wikipedia.org /wiki/Amstrad_CPC_6128 (2621 words)

	Differences of CRTC models (Site not responding. Last check: 2007-10-20)
		Motorola 6845, 6845-1, Hitachi 46505 The status register is not mentioned at all...
		Motorola 6845, Hitachi 46505: Bits 0-3: horizontal sync width in character times.
		The Motorola 6845 (or the Hitachi 46505, but unlikely) was first and defined a basic set of features.
	www.6502.org /users/andre/petindex/crtctest/internals/diffs.html (1063 words)

	MOTOROLA ANNOUNCES SPONSORSHIP OF INDY CAR TEAM FOR 1996 SEASON
		"Motorola is a recognized leader in consumer electronics, while Brix Sports and Comptech have both proven their championship-winning capabilities on the track.
		Motorola's sports marketing portfolio also includes a partner level sponsorship of the 1996 Summer Olympics in Atlanta; title sponsorship of the Western Open golf tournament on the PGA tour; title sponsorship of a professional cycling team racing in Europe and the United States; and sponsorship of running events in Phoenix, Chicago and Austin, Texas.
		Motorola is one of the world's leading providers of wireless communications, semiconductors, and advanced electronic systems and services.
	www.motorola.com /General/Press/PR951106_20950.html (635 words)

	Motorola 6845 - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-10-20)
		The 6845 contained counters that counted down at a speed determined by an external clock; the outputs of these counters were used to generate sync signals for an attached video monitor, and also timing and addressing signals for an attached frame buffer.
		The 6845 also had rudimentary hardware cursor support for text modes, as well as logic to support a light pen.
		Most machines that originally used the 6845 did not stray far from Motorola's original intent; Commodore's CBM series and the original IBM PC used it to display monochrome text on a relatively small screen.
	www.phatnav.com /wiki/index.php?title=Motorola_6845 (262 words)

	Video Graphics Array article - Video Graphics Array computer display standard 1987 EGA graphics adapters MCGA gate - ... (Site not responding. Last check: 2007-10-20)
		MCGA, also produced by IBM, was similar except that it was a simpler version of the VGA hardware.
		VGA is referred to as an "array" instead of an "adapter" because it was implemented from the start as a single chip (a gate array), replacing the Motorola 6845 and a full-length ISA board full of discrete components that the MDA, CGA and EGA used.
		This also allowed it to be placed directly on a PC's motherboard with a minimum of difficulty (it only required video memory, timing crystals and an external RAMDAC), and the first PS/2 models were equipped with VGA on the motherboard.
	www.what-means.com /encyclopedia/VGA (738 words)

	The 6845 Cathode Ray Tube Controller (CRTC) (Site not responding. Last check: 2007-10-20)
		The 6845 Cathode Ray Tube Controller (CRTC) is a programmable IC used to generate video displays.
		In most cases, the type of the detected 6845 is reported.
		The 6845 is selected when bit 14 of the I/O port address is set to "0".
	andercheran.aiind.upv.es /~amstrad/docs/crtcnew.html (475 words)

	VIDEO DISPLAY: Section Video display, Page 7 (Site not responding. Last check: 2007-10-20)
		The heart of display adaptor is the Motorola 6845 CRT controller that provides all the timing and control signals for the video display.
		The onboard screen refresh RAM is a dual-port memory that can be accessed either by the CPU or the 6845 CRT controller.
		6845 produces proper horizontal and vertical synchronisation pulses needed and reads out contents of the refresh memory in between synchronisation pulses to produce synchronised video data on screen.
	webclass.cqu.edu.au /Units/81120_Computer_Hardware_Fundamentals/Study/Modules/Video/sec1p7.html (282 words)

	Amstrad_CPC_6128
		The address generator was clocked at a constant rate so the 4bpp display generates half as many pixels as the 2bpp as a quarter as many as 1bpp.
		Both use the Motorola 6845 video address generator and the two have very similar sound output chips - the AY 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 exclusively noise channel.
		Simple reprogramming of the Motorola 6845 could produce extended graphics modes up to 784*384 pixels through overscan.
	www.tuxedo-shop.com /search.php?title=Amstrad_CPC_6128 (2364 words)

	Variable loadable character generator - Patent 4703322 (Site not responding. Last check: 2007-10-20)
		The character generator translates the character code of a character to be displayed to the dot pattern for that particular character, utilizing a minimum of hardware.
		The loadable character generator of the invention replaces the ROM/PROM by a RAM utilizing 2K and 8 RAM memories, a 4K by 8 memory, 4 MUX chips, and a Motorola 6845 CRT Controller with various registers and is loaded through the attribute buffer.
		Having described the invention so that a person of ordinary skill in the art can make and use it without undue experimentation, those skilled in the art will realize that many variations and modifications can be made to produce the described invention and still be within the spirit and scope of the claimed invention.
	www.freepatentsonline.com /4703322.html (5195 words)

	MOTOROLA TO SPONSOR A.J. FOYT IN PHOENIX 500 STOCK CAR RACE (Site not responding. Last check: 2007-10-20)
		MOTOROLA TO SPONSOR A.J. October 10, 1995 - Motorola, Inc. announced today it will sponsor A.J. Foyt's return to the desert to compete in the Phoenix 500 Winston Cup stock car race October 29.
		Foyt will be driving his Motorola sponsored Ford-Thunderbird as he makes his debut in the fall classic.
		Foyt, a 60-year old driving legend, is planning to augment his Indy car schedule next year by running a limited schedule in the Winston Cup series.
	www.motorola.com /General/Press/PR951016_17417.html (637 words)

	Questions and Answers about the early Video Adapters (Site not responding. Last check: 2007-10-20)
		The video controllers of the CGA and the Speccy use the Motorola 6845 CRT controller chip, which generates the colors.
		I would guess that it is because of the limitations of the Motorola 6845 controller or IBM's implementation of it.
		The Motorola 6845 CRT controller was designed for all types of displays and resolutions.
	www.talkaboutcomputing.com /group/comp.sys.ibm.pc.classic/messages/4894.html (1557 words)

	OLD-COMPUTERS.COM : The Museum
		Hewlett-Packard has been one of the first large manufacturer to adopt the Motorola 68000 microprocessor since 1981.
		The HP9816 was the fourth 68000 based computer of the brand.
		User could select the one that he wanted the computer to load at power-up.
	www.old-computers.com /museum/computer.asp?st=1&c=879 (284 words)

	The Machine Room :: IBM :: PC :: Technical (Site not responding. Last check: 2007-10-20)
		Rumour has it IBM was considering using the Motorola 68000, but Intel had a host of ready support chips for the 8088 CPU (as it was signal-compatible to the 8080).
		The Motorola 6845 CRT controller is used to generate the image.
		The CGA can only do one special attribute, blinking text (inverse and bright may be emulated by using the colours; underline is impossible without direct manipulation of the graphics chip, the Motorola 6845 CRT controller.
	www.machine-room.org /computers/268/technical.html (1479 words)

	Subject: Re: Firetrack (Site not responding. Last check: 2007-10-20)
		Note: Only certain variants of the 6845 have vertical sync width support, I'm led to believe such a variant has been used in the bbc micro, as data logging from BeebEm shows some games attempting to write to the top half of this register.
		(The original Motorola 6845 does NOT have programmable vertical sync width) The Watford Master Advanced Reference manual shows the values programmed to R2 for both horizontal and vertical sync widths for each screen mode.
		Vertical sync width is character lines (scanlinesPerChar+1), and horizontal sync width is in characters.
	www.mdfsnet.f9.co.uk /Archive/BBCMicro/2002/02/06/150409.htm (215 words)

	Subject: Re: Firetrack (Site not responding. Last check: 2007-10-20)
		> Note: Only certain variants of the 6845 have vertical sync width support, > I'm led to believe such a variant has been used in the bbc micro, as data > logging > from BeebEm shows some games attempting to write to the top half of this > register.
		According to my original Motorola 6845 data sheet, it's R3 that holds the width, not R2, and it does hold both widths in all but the first release batch of 6845's.
		All later ones and all 68A45 and 68B45 varients hold both (HSW in the lower 4 bits as you say).
	www.mdfsnet.f9.co.uk /Archive/BBCMicro/2002/02/06/195942.htm (192 words)

	6845 early programmable video controller chip from
		An early programmable video controller chip from Motorola, used in IBM's Monochrome Display Adapter (MDA) and Colour/Graphics Adapter (CGA).
		Because of the extensive use of the 6845, later and more capable video adapters like the EGA contained circuitry to emulate the functions of the 6845.
		A few months ago we were approached by a company wanting us to update their existing website with a fresher look and make it more optimised towards search engines to increase sales.
	www.ssiltd.co.uk /glossary/details.asp?item=1467 (203 words)

	hardware.txt
		----------- 1 = blinking on -------------- unused ^6845 - Port 3D8 (Color) 76543210
		To use the alarm, INT 4A must be a valid interrupt service routine.
		- configuration settings are maintained using the Motorola MC146818 Real Time Clock.
	www.arl.wustl.edu /~lockwood/class/cs306/class-resources/helppc/hardware.txt.html (5499 words)

	Ruud's Commodore Site: EC8032K (Site not responding. Last check: 2007-10-20)
		The video card developed by Elektor is based on the Motorola 6845 and can display 25 lines of 80 characters (80*25).
		The CBM 3032 has a discrete video circuit and can only display 40*25.
		The 4032, at least the version I know, has a 6845 based video circuit but also only displays 40*25.
	www.baltissen.org /htm/ec8032k.htm (531 words)

	Orion (Homebrew)
		The video controller board based on the motorola 6845 chip.
		The video sync rates were tunable from internal registers.
		Later the remainder was added to provide two conventional serial ports to allow this system to use the bellatrix keyboard, and to also perform as a termina connected to a regular external accoustic coupled 300 baud modem, dialed into a mainframe.
	www.vinci.org /rlv/rpcm/orion (518 words)

	EnTech Taiwan :: View topic - Horizontal timing and pixel-perfect resolutions
		A common question among, e.g., plasma owners, is why horizontal timings cannot be specified in terms of individual pixels - i.e., why 848x480 instead of an optimal 852x480, or 1368x768 instead of the native 1366x768?
		The reason is that graphics cards almost invariably do horizontal timing in terms of character clocks of 8 pixels, rather than in terms of individual pixels - a legacy of the original Motorola 6845 CRT controller.
		At the hardware register level, 848x480 is actually programmed as 106 character clocks x 480 lines - 106 characters of 8 pixels each equals 848 total pixels.
	www.entechtaiwan.net /forums/viewtopic.php?t=20 (344 words)

	Who Is Custom IDEAS? < CIdeas < TWiki
		Jon has also been involved with the network modernization effort to partition a campus size LAN into several smaller networks.
		Jon's numerous other accomplishments include the configuration of a board support package for a Motorola 88000 based CPU running under the commercial real-time operating system pSOS
		He also has extensive experience in embedded device driver development, serial communications driver development (from the physical through the network layers of the ISO model), start-up ROM development, and built-in-test routines.
	www.cideas.com (792 words)

	13.1 Integrated Circuits (Site not responding. Last check: 2007-10-20)
		6820 40 1 Peripheral Interface Adapter (PIA) Motorola 6821.
		6850 24 1 Asyncronous Communications Interfce Adptr Motorola 68000.
		1 "Bandit" [422000] Graphics IC Motorola 68328 144 1 "DragonBall" MPU Motorola 68330.
	www.fsref.com /Fatal/FE130100.SHTML (600 words)

	fire8
		3.1.3 endianism of FIRE is based on the Motorola 68k.
		There is an outfit that makes enclosures that fit the modularity aspect of the above, Bud or Budd Enclosures.
		4.2 Hardware Features of the Default (minimum cost) CPU Module 4.2.1 reset and vectored reset buttons 4.2.2 Motorola 68020 or 68020-based 32 bit by 32 bit MPU.
	linux01.gwdg.de /~rhohen/fire8.htm (1071 words)

	How unlock MOTOROLA T830 and A920 3G - GSM-Forum (Site not responding. Last check: 2007-10-20)
		How unlock MOTOROLA T830 and A920 3G - GSM-Forum
		GSM-Forum > Mobile Phones > Motorola > P2k Series
		Only by imei,but as I know stand alone solution is on the way.
	forum.gsmhosting.com /vbb/showthread.php?t=131810 (110 words)

	Video displays: Section Video displays, Page 8 (Site not responding. Last check: 2007-10-20)
		The reasoning is that an 8 x 8 matrix can be produced with simpler digital logic (2
		), the 640 x 200 dots can be stored in 16K of memory which can easily be controlled by the Motorola 6845 CRT controller --and cheap TV sets can be used.
		Last modified: Tue Jun 24 11:19:41 1997 by sharonn
	webclass.cqu.edu.au /Units/81120_FOCT_Hardware/Study_Material/Study_Guide/chap2/sec1p8.html (127 words)

	Photo Properties (Site not responding. Last check: 2007-10-20)
		Motorola's 6845 CRTC - the heart of the CGA, and (amonsgt others) the Amstrad CPC, and BBC Micro.
		File Upload Date: Sat Jan 12 14:18:52 2002
		Item Capture Date: Thu Nov 15 23:06:52 2001
	www.lesser-evil.com /gallery/view_photo_properties.php?set_albumName=InsideXT&index=16&gallery_popup=true (34 words)

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