This is a branch of the X11 terminal emulator
(itself a branch of the
rxvt terminal) with several modifications
to make it more useful for Roguelike development, as well as BBSing.
The RGA evolved from numerous, older revisions of a CGA/EGA/VGA framebuffer
emulator written for the graphical version of
Kareltima III. The acronym is obviously derived from IBM's 80s fetish for
naming graphics cards X Graphics Adapter. In this case, RGA is the
Roguelike Graphics Adapter. Keep your tongue firmly in your cheek as you
It offers a number of features useful in Roguelike development:
- Unicode (using the UTF-8 encoding). With the right fonts (which come free with most X11 installations), you can have thousands of glyphs at your fingertips.
- Enhanced keyboard support. Applications can receive detailed information about key presses, including dead keys and modifier keys (like Shift, Control and Alt).
- Mouse support. Okay, most terminals have this built-in.
- 512 colours instead of the traditional 16 (or, on more modern terminals, 256).
- Used with the right fonts, you can get a 1:2 character cell aspect ratio, which helps in anticipating and reducing spatial distortions in roguelikes (where, typically, one horizontal step is shorter than a vertical or diagonal one, because of the non-square character grid).
The RGA understands the standard X3.64 terminal directives, just like rxvt. In addition, a couple of them have been extended to support more colours, and a couple of non-standard ones were added to control additional behaviour.
To facilitate roguelike development, certain other features that come as standard on terminal emulators (like resizing the window) have been disabled by default.