l18 - 6.111 Lecture # 18 More Video MC6847 Display...

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6.111 Lecture # 18 More Video MC6847 Display Controller Obsolete but useful All Points Addressable Digital System Side 1
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MC6847 with Character ROM Note the hardware hack To get around a bug in way /HS is generated (The first /HS of a frame is AFTER the first row of dots) 2
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Black and White (or Green) Simple way of driving monitor Has composite sync on the video Adjust pot (top) so bottom of sync pulse has V=0 3
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Color Output Need to decode the 'chroma' outputs AM25LS32 has fast comparators Comparators on left decode 'S38 is open collector NANDs Gates on right drive RGB 4
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1 2 3 4 5 6 7 8 Vertical Sync Generation MC6847 generates blanking but not the vertical sync pulse Here is one legitimate use for one-shots RGB Cable Pin Intensity Pin Reg Pin Green Pin Blue Pin GND Pin GND Pin HSYNC Pin VSYNC 5
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LM1882 Sync Generator Programmable, flexible part 6
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Store timing information in registers Example 256 pixels wide 256 lines 5 MHZ clock (probably not typical) 7
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l18 - 6.111 Lecture # 18 More Video MC6847 Display...

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