This idea isn't new for Taito. Look at the Wolf System...Pentium 200 MMX with a Voodoo1 in 1998. This was used just before G-NET, which is just a PS1 based system(using PCMCIA cards for game media).
Before that, the last system that was really custom designed by Taito(not counting console mods) was the JC System. http://www.system16.com/taito/hrdw_jc.html
Before that, the last system that was really custom designed by Taito(not counting console mods) was the JC System. http://www.system16.com/taito/hrdw_jc.html