The vram chips are on tricky place to see, but it seems in this machine there are two 41464 dram chips, so 64KB total. So that expansion is for adding that missing 64KB. So V30F has two different hw variants? Was that confirmed that V30F without this expansion slot at the back has really 128KB vram size?
Probably one of the rarest cases on MSX where this optional VRAM was used to store data (this VRAM can't indeed not be accessed directly, only VRAM/RAM and RAM/VRAM transfers are possible).
The vram chips are on tricky place to see, but it seems in this machine there are two 41464 dram chips, so 64KB total. So that expansion is for adding that missing 64KB. So V30F has two different hw variants? Was that confirmed that V30F without this expansion slot at the back has really 128KB vram size?
So it could also mean that the 'standard' V-30F would have only 64kB VRAM, just like the V-25. But 128kb VRAM is announced in front. Very confusing....
