I found in the parts list that U2 and U3 use the 27C040 4meg eproms and I found and down loaded the images from IPDB . Here's my issue the parts list shows 27C040 eproms "masked" for U4 thru U9. I know the masked roms are a one time burn from the factory so were can I get the images for U4 thru U9? Don't see them on IPDB?
Any help is appreciated.