Well, you do have the roms in the proper sockets for the most part. The Flipper ROMS take up IC20 and IC17, the game roms taking up IC14 and IC26. The real question is do you have the right ones in the right sockets?
Flipper ROM 1 goes to IC20, Flipper ROM 2 goes to IC17. You have these right.
Your game roms are a different story. You apparently have L-3 Roms, and with out the label indicating which one they are, I'd have to figure out which game rom has D800 checksum. However, I cannot find any L-3 checksums, all I have are checksums for L-4, and Google isn't helping me at all. If I can figure out how to generate some, I can figure out which position has D800 checksum and where it goes. Right now you just have to guess and try; the flipper roms are in the right spot so it'll either work that way, or work after you swap the white roms. I'll keep digging for checksums and let you know what I come up with. Someone may have an old checksum list lying about.
Here are the positions as they are on the board since they're not marked.
IC26 (Game Rom 0) IC20 (Flipper Rom 1)
NOT USED IC17 (Flipper ROM 2)
NOT USED IC14 (Game ROM 1)
The white chips with the glass windows are in fact EPROMS. It was recommended that most of the original PROMS be changed to EPROM, both for game and flipper rom data. The Flipper ROMS tend to survive if they're not pulled out; but the game roms have undergone several revisions. If yours say rev 3, the lastest for Black Knight is L-4. It might be worth looking in to a new set.
Those sockets don't have notch, but there's a little dot near the sockets which shows where pin 1 should go; they also align in the same direction as the PIA and CPU; so they're installed correctly.
I don't seem to recall the dip switches doing much of anything on a System 7 board, I believe that was a throwback to the system 3 software which did not have a computerized adjustment/audit/diagnostic system; you used to have to flip indvidual bits and insert them in the CPU. I will double check on this as soon as I track down a good copy of the System 7 reference manual.
Post edited by dewdude82: tried to blockquote the IC positions