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video board investigations

Wawavoun

Member
Joined
May 17, 2020
Messages
49
Location
Alsace Yo !
Hello there,

I am working on a hi res graphical board based on a Thomson EF9367.

Its a Elektor design published in 10/1985.

They can work into 512 pixels (H) x 256 (V) non interlaced or into 512 x 512 interlaced.

In the first mode no problem at all, the lcd tv used via composite video input works well.
Into 512x512 interlaced mode the top of the display is on the bottom of the screen (see picture).

The board is initialized by a kind of driver that I have only in binary format.

I give a look to the EF9367 datasheet and I dont find any information about video timing control like for a 6845 for example.

What is the best way to improve the situation ?

Thanks, regards.
Philippe
 

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  • 20220523_133637 LR.jpg
    20220523_133637 LR.jpg
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After graphical commands the text display come in the bottom of the page so a vertical scroll is generated automatically... No display problem at all !
 
Interesting... I have also this Graphic card from Elektor at home... and I have the additional (bare) card for colors too. That will be a new topic for in the winter. Do you have that color extension card too ??
 
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