I have an ancient but functional 520 STM. Its got a (fault so removed) 512k Ram upgrade and 6 chip TOS 1.00 but with zero pads for upgrading to 2 chip TOS.
Rather than make life difficult with bending pins and adding OR gates etc.. is there an easy guide I can pass to my friend-with-Eprom-burner to burn me a 6 chip TOS set?
Is TOS 1.04 the best I should fit for an old ST?
My mobo has different labels for the chips to others I can find so I need to know how we split the image into 6 chip images and then which chip goes in which socket, please