IMG_5503.jpeg - nothing in H3
IMG_5505.jpeg - EPROM + RETRO adapter in H3
The one I linked earlier in the thread: Major Brands 27C512-15 EPROM, 28 Pin, DIP 150 Nanoseconds, 64k x 8, 5Vs. There are some labeled solder pads on the adapter, I’ll check if these are the pins you mentioned when I...