HP-41 and video interface 82163a / 92198a

[Gilles]

(05-19-2015 01:21 PM)Vincent Weber Wrote:  Tranks a lot, very informative !
Do you know about this othello program ? Did it make use of cursor control to redraw only the updated part, or if it was reporting everything like a printer ?
Also it talks about being able to scroll up and down form a virtual window of 31 lines compared to the screen 16 lines. Any idea how this was done on a 41 ? Were the bst/sst keys used for that ?

There is no source in the article.

But you can find information in the 82163 owner's manual

There are ESC sequences to move the cursor in the 4 directions and to move cursor to a display address (row column) ( 27 37 column row ). So it seems easy to rewrite only a part of the screen with the ACCHR command. You can also "roll up" (27 83) "roll down" (27 84) the screen etc...