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Finally found some schematics, looks like 78/79 arent is use so maybe some hope after all. Checked continuity on that right side and most are fine, just cant find a spot to test 3 of the pins, so Im assuming it may be alright for now if I am reading this right.

Thanks guys much appreciated, I didnt know if this was a bit old to reply to! First the easy part.... Is this all good to replace the 2 Colour ram ICs with? https://www.ebay.com/itm/FUJITSU-MB8464A-80L-SK-INTEGRATED-CIRCUIT-DIP-28-LOT-OF2-NEW-/253518517057 Secondly I have attached a...

I know its a long shot but thought Id try, I have the same issue as this but am not sure what to replace them with or where to get them, any help would be great!!