The Amiga version of Sierra's AGI has extensive mouse support for
menus, ego movement and dialog boxes. Sarien implements mouse support
in a similar way. The MS-DOS version of Sierra's AGI had no mouse
support.
High resolution pictures
Sarien
Sierra AGI
Background pictures in Sierra's AGI are 160 pixels wide. Since these
images are stored in vectorial form, Sarien 0.7 renders the pictures
doubling the X resolution. Classic and hi-res modes can be switched
at runtime from the interpreter console, in case it produces
undesired artifacts.
Amiga-ish palette
Sarien palette
PC EGA palette
Amiga and IIgs versions of the Sierra AGI interpreter use different
colors if compared to the standard PC EGA versions. Notably red and
blue are softer, making these colors more suitable for skin and sky
tones. Sarien uses a mix of the Amiga and EGA palettes, using the
softer blue/red colors but keeping EGA's magenta and cyan.
Aspect ratio correction
Sarien on a square-pixel screen
Sierra AGI on a square-pixel screen
The PC version of Sierra's AGI uses the 320x200 video mode of the EGA
graphics card. When displayed on a square-pixel video mode such as
320x240 or 640x480, AGI pictures may appear "squashed". Sarien fixes
the aspect ratio of the images, preserving the original proportions
as displayed by the EGA controller.