Hardware wise, was it just a TG16 with a JAMMA frame and connectors, or something more?
According to the many arcade game database sites:
Main CPU : 68000 (@ 16 Mhz)
Sound Chips : (2x) OKI6295 (@ 12 Khz)
Screen orientation : Horizontal
Video resolution : 320 x 240 pixels
Aspect Ratio : 4/3
Screen refresh : 60.00 Hz
Palette Colors : 32768
So, it was a bit more. =) It also apparently featured a female freind for Bonk as a playable Character (and I don't mean Princess Za).
-bt