So i found this document that talks sbout the different IC's needed to convert a 12v apple III system bosrd to the 5v system : https://www.apple3.org/Documents/Technotes/TA31049.html
I have an apple III system board i repaired by using a 12v memory board from another working system. I do have a spare working 256kb 5v ram board so i have to convert the system board over to use the 5v 256kb rsm. Where can i find these roms? Has anyone done this change before? Need info on this. Thanks guys.