Thanks for the mention uofmer , just to add a note about the lamps test: I've been using the lamps test ROM to diagnose the lamps on my black knight (https://pinside.com/pinball/forum/topic/differences-in-hardware-wiring-black-knight-v3-vs-v4#post-4866292). To summarize that, it turns out PIA3 was weak. It would run the lights fine for about 10 seconds after power up and then all but one column of lights would fade out. I replaced IC12, IC13, IC14, and IC19 before replacing IC10 (PIA3), but in the end it was IC10 that was the problem. I do think the other ICs were also part of the problem and may have been the cause of IC10s ultimate demise as they also showed some issues when on the scope.

Anyway, the thing that made it difficult to diagnose was that my lamps test ROM showed all the lamps to work just fine for as long as I desired but when I switched back to the Williams ROM, the problem was still there.

If you think this could be the problem you're having Onevox I would suggest trying out my lamps test ROM (as well as all of the ROMs leading up to it) and see if the lights work there. If the lamps work fine there, then you may have a weak PIA3 chip. If that's the case I recommend changing the above ICs, including IC10.

I'm working on adjusting the lamps ROM to test for a weak PIA but I haven't figured out a way to do it yet. At least I have a weak chip to try it out on

Hope this helps

EDIT: Also, be sure to run the clear-cmos ROM (with coin door open) as it will clear out the 5101 chip and force it to re-initialize it when you then boot the Williams ROM. Make sure the coin door is open the whole time. After you've booted into audit mode you can close the door and power cycle into game mode if you like. This may help with some of the other problems you're experiencing.

Its too bad you don't have a programmer handy. It could save you swapping out good chips for no reason.

The ROM order does matter. ROMs don't usually go bad, but that doesn't mean they don't. With a burner you could also compare the contents with a known good image to see if they still work.

I'm not certain what the 4040 code is, but if you're booting to audit mode then you have the flipper roms in the right order. Are you certain the game rom(s) are in the right sockets?

Are you able to manoever the audit mode with the coin door buttons?

What's a good source for 2716/2816 chips? I bought a bunch years ago when a local store was clearing them out, but other than ebay, I don't know where to source them, and the alternative now seems to be a bigger, newer chip with an adapter board..

Interesting, and where do you get them? digikey and mouser don't appear to have them in through-hole configuration..