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Applecorn
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Update README.md

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@ -69,16 +69,20 @@ is set to `&0E0`.
### Video Modes
Two text video modes are currently supported:
- 40x24 `MODE 6` and `MODE 7` (in mode 7, chars $80 to $9F are converted
Two text video modes and one graphics mode are currently supported:
- `MODE 6` and `MODE 7` - 40x24 text (in mode 7, chars $80 to $9F are converted
to spaces)
- 80x24 `MODE 3`
We plan to support HGR graphics eventually.
- `MODE 3` - 80x24 text.
- `MODE 2` - Apple II high resolution mode. The physical resolution is 280x192
pixels. This is mapped onto the normal BBC Micro 1280x1024 virtual resolution,
with the origin at the bottom left of the screen.
_NOTE:_ You can set the startup video mode by holding down the appropriate number
key while Applecorn starting (while it is loading the ROM file.)
Andy McFadden's [FDraw library](https://github.com/fadden/fdraw) is used for
efficient high resolution line and point plotting.
### Escape Key
The BBC Micro uses interrupts extensively and the Escape key is handled