CRTC - Revision history

Longshot at 17:47, 29 May 2025

2025-05-29T17:47:10Z

2025-05-24T18:48:52Z

Updated for infringement of copyrighted material protected

2025-05-22T20:38:28Z

← Older revision		Revision as of 20:38, 22 May 2025
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	* '''This article relies largely on a single source and is suspected of infringing copyright protected under the [https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode CC BY-NC-ND 4.0 license].''' Readers are encouraged to refer directly to the original source material for accurate information.		* '''This article relies largely on a single source and is suspected of infringing copyright protected under the [https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode CC BY-NC-ND 4.0 license].''' Readers are encouraged to refer directly to the original source material for accurate information.
	** ''Original source material under copyright: [https://shaker.logonsystem.eu/ACCC1.8-EN.pdf The Amstrad CPC CRTC Compendium]''		** ''Original source material under copyright: [https://shaker.logonsystem.eu/ACCC1.8-EN.pdf The Amstrad CPC CRTC Compendium]''
	** ''Author: Serge Querné (Longshot)''		** ''Author: Serge Querné ([[Longshot]])''

	<br>		<br>

2025-05-21T18:02:47Z

Added information on citation issues

← Older revision		Revision as of 18:02, 21 May 2025
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	NOTES:		NOTES:
	* This document describes the functionality in terms of the CPC with its separate CRTC and Gate-Array. The Plus has both integrated into the same IC, but could be considered to have two functional blocks, one for CRTC and one for Gate-Array. In this document the term 'Gate-Array' is used, but this also applies to the ASIC.		* This document describes the functionality in terms of the CPC with its separate CRTC and Gate-Array. The Plus has both integrated into the same IC, but could be considered to have two functional blocks, one for CRTC and one for Gate-Array. In this document the term 'Gate-Array' is used, but this also applies to the ASIC.
	* ~~Much~~ information ~~has been drawn from the~~ [https://shaker.logonsystem.eu/ CRTC Compendium] ~~documentation. For more details, timing diagrams, code examples, coding tips, and more, refer to that documentation.~~		* '''This article relies largely on a single source and is suspected of infringing copyright protected under the [https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode CC BY-NC-ND 4.0 license].''' Readers are encouraged to refer directly to the original source material for accurate information.
			** ''Original source material under copyright: [https://shaker.logonsystem.eu/ACCC1.8-EN.pdf The Amstrad CPC CRTC Compendium]''
			** ''Author: Serge Querné (Longshot)''

	<br>		<br>

2025-05-18T22:22:10Z

Links

← Older revision		Revision as of 22:22, 18 May 2025
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	* [http://en.wikipedia.org/wiki/6845 Wikipedia on the CRTC]		* [http://en.wikipedia.org/wiki/6845 Wikipedia on the CRTC]
	* [[Media:ACCC1.8-EN.pdf]] CPC CRTC Compendium - Latest (04/2024!) document containing in-depth info about CRTC programming on CPC.		* [[Media:ACCC1.8-EN.pdf]] CPC CRTC Compendium - Latest (04/2024!) document containing in-depth info about CRTC programming on CPC.
			* [[Media:CRTC Compendium Podcast.mp3]] The CRTC Compendium digested in podcast format
	* [http://www.grimware.org/doku.php/documentations/devices/crtc CRTC documentation from Grimware]		* [http://www.grimware.org/doku.php/documentations/devices/crtc CRTC documentation from Grimware]
	* [http://quasar.cpcscene.net/doku.php?id=assem:crtc Quasar CRTC documentation (in french)]		* [http://quasar.cpcscene.net/doku.php?id=assem:crtc Quasar CRTC documentation (in french)]
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	* [[Media:Dossier CRTC(Ramlaid Mortel).pdf]] Les entrailles du CRTC		* [[Media:Dossier CRTC(Ramlaid Mortel).pdf]] Les entrailles du CRTC
	* [https://thecheshirec.at/tag/crtc6845/ Leçons CRTC (CheshireCat)]		* [https://thecheshirec.at/tag/crtc6845/ Leçons CRTC (CheshireCat)]
	* [[Media:CRTC Compendium Podcast.mp3]] The CRTC Compendium digested in podcast format
	* [https://martin.hinner.info/vga/pal.html PAL video timing specification]		* [https://martin.hinner.info/vga/pal.html PAL video timing specification]

2025-05-18T22:15:24Z

CRTC Type Detection

← Older revision		Revision as of 22:15, 18 May 2025
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	== CRTC Type Detection ==		== CRTC Type Detection ==

			It is possible to detect the CRTC Type using software methods, and this is done to:

			* warn that the software was not designed for the detected 6845 and may function incorrectly
			* to adapt the software so that it will run with the detected 6845
			* In most cases, the type of the detected 6845 is reported

			Detection routine in BASIC:
	<pre>		<pre>
	10 MODE 1:' Reinitialize screen		10 MODE 1:' Reinitialize screen

2025-05-18T22:13:18Z

Overview

← Older revision		Revision as of 22:13, 18 May 2025
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	3. In the Amstrad community each 6845 implementation has been assigned a type number. This type identifies a group of implementations which operate in exactly the same way. The type number system was originally used by demo programmers.		3. In the Amstrad community each 6845 implementation has been assigned a type number. This type identifies a group of implementations which operate in exactly the same way. The type number system was originally used by demo programmers.

	~~It is possible to detect the 6845 present using software methods, and this is done to:~~

	* warn that the software was not designed for the detected 6845 and may function incorrectly
	* to adapt the software so that it will run with the detected 6845
	* In most cases, the type of the detected 6845 is reported

	<br>		<br>

2025-05-18T21:21:27Z

← Older revision		Revision as of 21:21, 18 May 2025
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	[[File:CRTC Type 0.jpg\|thumb\|right\|CRTC Type 0]]		[[File:CRTC Type 0.jpg\|thumb\|right\|CRTC Type 0 (Hitachi)]]
			[[File:CRTC UMC Type 0.png\|thumb\|right\|CRTC Type 0 (UMC)]]
	[[File:CRTC Type 1.png\|thumb\|right\|CRTC Type 1]]		[[File:CRTC Type 1.png\|thumb\|right\|CRTC Type 1]]
	[[File:CRTC6845-Type2.jpg\|thumb\|right\|CRTC Type 2]]		[[File:CRTC6845-Type2.jpg\|thumb\|right\|CRTC Type 2]]

2025-05-18T21:17:01Z

← Older revision		Revision as of 21:17, 18 May 2025
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	[[File:CRTC Type 0.jpg\|thumb\|right\|CRTC Type 0]]		[[File:CRTC Type 0.jpg\|thumb\|right\|CRTC Type 0]]
			[[File:CRTC Type 1.png\|thumb\|right\|CRTC Type 1]]
	[[File:CRTC6845-Type2.jpg\|thumb\|right\|CRTC Type 2]]		[[File:CRTC6845-Type2.jpg\|thumb\|right\|CRTC Type 2]]

2025-05-18T20:53:51Z

← Older revision		Revision as of 20:53, 18 May 2025
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			[[File:CRTC Type 0.jpg\|thumb\|right\|CRTC Type 0]]
	[[File:CRTC6845-Type2.jpg\|thumb\|right\|CRTC Type 2]]		[[File:CRTC6845-Type2.jpg\|thumb\|right\|CRTC Type 2]]

← Older revision		Revision as of 21:21, 18 May 2025
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	[[File:CRTC Type 0.jpg\|thumb\|right\|CRTC Type 0]]		[[File:CRTC Type 0.jpg\|thumb\|right\|CRTC Type 0 (Hitachi)]]
			[[File:CRTC UMC Type 0.png\|thumb\|right\|CRTC Type 0 (UMC)]]
	[[File:CRTC Type 1.png\|thumb\|right\|CRTC Type 1]]		[[File:CRTC Type 1.png\|thumb\|right\|CRTC Type 1]]
	[[File:CRTC6845-Type2.jpg\|thumb\|right\|CRTC Type 2]]		[[File:CRTC6845-Type2.jpg\|thumb\|right\|CRTC Type 2]]

← Older revision		Revision as of 21:17, 18 May 2025
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	[[File:CRTC Type 0.jpg\|thumb\|right\|CRTC Type 0]]		[[File:CRTC Type 0.jpg\|thumb\|right\|CRTC Type 0]]
			[[File:CRTC Type 1.png\|thumb\|right\|CRTC Type 1]]
	[[File:CRTC6845-Type2.jpg\|thumb\|right\|CRTC Type 2]]		[[File:CRTC6845-Type2.jpg\|thumb\|right\|CRTC Type 2]]