As far i know an ax370 is build with more conventional chips and the wavy 70 's have
an field prog logic area .
But it is possibel that it 's depending of production date or modifications
Mine has a V9958 and 128KB, I opened a thread some time ago about it: http://www.msx.org/forum/msx-talk/hardware/al-alamiah-ax-370
I've noticed that I forgot to upload some PCB pics. As probably soon I'll need to open it, I'll also try to update the thread.