I think a while ago DamageX, our american MSX-friend, somehow upgraded amount of memory in his S1985-based MSX-2 system. I tried to find the thread with information, but failed. DamageX, can you please help me with info? We can chat via ICQ/GTalk/MSN/IRC or any other means you prefer. I would love to upgrade my revived Sony HB-F1 from 64K to 512K, or even more!
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So no clues there...
Besides S1985 engine it's got a custom IC that I never saw before. I'm just guessing it serves as DRAM address multiplexer, and controller for that autofire / speed control stuff. 'custom IC' isn't a problem, but missing documentation (datasheet / schematic) is.