[neverendingsigh]

The AGB's resolution is 240x160. The panel used is new-old-stock or reproduction equivalent from the BlackBerry Curve 9380: a 480x360 panel, which allows the AGB adapter to output a 2x integer-scaled 480x240 image.

When playing a DMG or CGB game, the image is still 2x but otherwise the image and behavior comes from the stock AGB hardware: a default scale places a 160x144 image in the center of the display, and pressing the L and R buttons allow you to toggle between that native mode and a horizontally stretched mode (that basically nobody likes).

The tearing existed in the initial version of the adapter ribbon, as the 9380's display driver refreshes the display in portrait rather than the AGB's landscape. The second revision of the adapter, which started shipping only a couple months after the initial, way back in 2019, adds a 1-frame buffer to output the signal in the way that the display driver expects. The AGB's frame rate is a hair under 60Hz, so this does introduce a 16ms delay, but in the vast majority of AGB games this drawback is outweighed by all of the other benefits.