Here's a summary of handheld changes in MAME 0.182 released today at

New games:
- Conic Electronic Basketball [hap, Sean Riddle]
- Conic Multisport/Tandy Sports Arena [hap, Sean Riddle]
- Gakken Galaxy Invader 1000/Tandy Cosmic 1000 Fire Away [hap, Sean Riddle, Kevin Horton]
- Mattel Dalla$ (J.R. handheld) [hap, Sean Riddle]
- Mattel Thoroughbred Horse Race Analyzer [hap, Sean Riddle]
- Tiger 7 in 1 Sports Stadium [hap, Sean Riddle]

Other improvements were Entex Space Invader getting proper internal artwork. And important bugfixes to Comp IV, Electronic Detective, Codename Sector. The latter 2 were never playable at all, blame me for not playtesting them much (they're very complex games).