Legend of Hero Tonma, running on the Irem M72 boardset (the same hardware that powers the legendary game R-Type), is what is known in the trade as a seriously cool game. Keep your Mortal Yawnbat and Street Fighter MCMLXX, Legend of Hero Tonma beats them on interest level, graphics, sound and gameplay. LOHT, from Irem, is a three-board set based on an NEC V30 (enhanced Intel 8086 clone) and an NEC 780-1 (Zilog Z-80A clone), with some fairly complex graphics ASICs fron Nanao. The game is a 4-way swords'n'sorcery "rescue the legendary princess" scrolling platformer with two- or three-level parallax scrolling, lovely Japanese graphics and soft, tinkly music, plus some of the coolest demonic level bosses you will ever see.
Level 2 boss is my favorite so far; it's a huge evil tree. Twisting, deadly roots hang from the ceiling, and acorns materialize overhead and fall in dangerous clusters. Periodically, little tree-demons come out of the big tree's mouth. Shoot one, and it splits into three tiny treelets which you then have to kill QUICKLY! You need a weapon with a wide arc of fire to kill the monster, as you can't jump because of the roots dangling from the ceiling, and you therefore can't get a clear shot at the mouth, the only vulnerable part of the beast.
Legend of Hero Tonma uses a horizontal low-res monitor, one or two 4-switch joysticks with two buttons, and it has a standard JAMMA pinout. The board does not require a -5V rail. DIP switch settings are as below:
DIP Switch Bank 1
DIP Switch Bank 2