FluBBa has released a pretty large update to his Sega Master System emulator for the Gameboy Advance. Changes:

Added support for running the GG bios in SMS mode.

Added support for all SMS Bioses.

Added option in builder for”empty”slot at the end of ROMlist. (Loopy).

Added option to lock the 2 toprows in unscaled mode.

Added”Perfect Sprite”option for games like: Global Gladiators. GP Rider (GG). Speedball 2. Xenon 2.

Added emulation of locking the right side of the screen, games: Gauntlet. Golvellius. Griffin (GG). Line of Fire. Megumi Rescue. Rygar.

Fixed IO port 2, Laser Ghost.

Fixed Monaco GP, SG-1000.

Fixed the support for Jang Pung II (KR).

Fixed priority on zoomed sprites in mode 0&2 (Bank Panic, SG-100).

http://hem.passagen.se/flubba/gba.html