Hi, I have a II+ rev. 4 with a Swedish 2513 character generator that I want to replace with an English character ROM. I've built a little adapter board so I can use 2716 EPROMs (or actually 28C16 EEPROMs), using this PCB as a template: https://oshpark.com/profiles/Benchoff
Everything works fine except the first column of pixels is always black:
According to the 2513 schematics it's Out 5 that's not working correctly, but I've gone through all the connections several times with the multimeter and can't really find any fault. When I put the 2513 back all characters are display correctly again, so it's definitely something wrong with my adapter board. Or am I missing something here regarding 2716/28C16 usage?