Gregory's Serversome old DOS utilities had a graphical mouse cursor in text mode! i’ve investigated how they did it. https://mastodon.social/@tubetime/111123817309591559
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 most recently, i reverse engineered a rare Apple II sound card (a sampler) using some blurry photos AND ARTWORK ON A RECORD ALBUM COVER!! https://mastodon.social/@tubetime/111508413193886509  @tubetime It was done dynamically redefining the appearance of a group of characters. This was only possible on VGA (and some older EGA) video cards. Assuming the mouse pointer can move one pixel in any direction, and the mouse pointer occupies the room of only one character, you will need to redefine one, two, or four characters, depending on the pointer location.  @tubetime Oh, that was not that difficult. VGA could display two 256 char fonts at once. You selected thag by a single bit in the color attribute. All you need to do is to render the characters occupied by the mouse-cursor into font2 and put the mouse-cursor image on top of it. Then adjust character and attributes as needed. You could render quite a bit of bitmap graphics that way in text-mode.  |
in October, i spent a bunch of time reverse engineering the power board from the IBM Thinkpad 700. it was a good excuse to switch to KiCAD 7, which allows you to overlay your layout on top of an image–perfect for reverse engineering work! https://mastodon.social/@tubetime/111298635503517686