Motorola 6847: Difference between revisions

Latest revision as of 15:58, 14 April 2026

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-{{Merge|VDG}}
+#REDIRECT [[Video Display Generator]]
-{{Merge|Video Display Generator}}
-The MC6847 is a video display generator chip that is designed for the 6800 family of microprocessors.  It reads data from memory (via the [[SAM]] chip) and displays the contents on screen.   The 6847 is used on Coco 1 and 2's only; this function was replaced by the custom [[GIME]] chip in Coco 3 models.
-The chip provides a 32×16 alphanumeric display, or graphic displays up to 256×192 pixels in resolution.   Additionally, a variety of "semigraphics" modes are provided.
-On the Coco, the familiar dark-green on light-green text is generated as a fundamental function of this chip.
-In Coco 1's and most Coco 2's, the 6847 is not capable of displaying lowercase.  Instead, lower case text appears inverted. Later Coco 2's replaced the 6847 with a 6847T1 that can display proper lower case text.
-==See Also==
-*[[VDG]]
-*[[Video Display Generator]]
-*Wikipedia article on the [http://en.wikipedia.org/wiki/Motorola_6847 Motorola 6847]
-*Datasheet http://instruct1.cit.cornell.edu/courses/ee476/ideas/mc6847.pdf
-[[Category:Hardware]]