The BP1200 might be an old programmer but it is a great programmer. Old 2716, 2532 Eproms needing 25V programming voltage; it is no problem for the noisy BP1200. It even is capable of programming the old bipolar proms for the first Bally sound boards for example. We had a few BP1200 here also at work, they are retired now but still hanging here as a back up.

A few things run into my mind what might went wrong.

-be sure to load the files as a binary. Normally, BPwin will recognize the file as a binary. If you want to be sure rename your files as U2.BIN and U6.BIN
-are you using rebranded China Eproms? Or using "originals"?
-your files are corrupted….try another set from another game or source (IPDB.ORG)
-there is an error in the rejumpering of the board. Be sure you removed E13-E15 and E36 next to U2 for example.

when I use a 2732 for a system 6, it is just for one IC. The other two still remain 2716's (the flipper roms). Are you trying to use a 2732 for all three? A little confused at what you are trying to do.

Tip of the hat for the clever thread title.

Might be worth posting a clear picture of the MPU board so we can double check your jumper settings.
In any case, this is how I do it for 2732 EPROMs - sorry it doesn't mention what jumpers to remove:

BY-35_After.jpg

NEC2732 (uPD2732D) are fine. They need 25V programing voltage indeed. As long as you choose uPD2732 (or D2732) you are fine. Things go wrong when selecting upD2732A as they are suited for a lower programming voltage - you will probably ruin them in this case.

Check your (jumper) work at your board. It is pretty easy to ruin a trace from pads E1, E2, E4, E6 for example when removing the old jumpers. Maybe you missed a jumper that should be removed.

You can also try another set binaries from another game or another source....

What happened with E2 - E6? Is there a short between E2 and the trace in between?

No, E9 is address line A11. I prefer it this way so U2 goes into standby when it's not being accessed. It's also the preferred method on the official PPS site:
http://www.planetarypinball.com/mm5/Williams/tech/bally_read1st.txt

Also, it looks like the through hole at E19 is damaged. Install a wire in the hole and solder the wire on both sides (front and back of the board).

Quench - Interesting on the E12-E9 - I have always just taken it to ground. Noted

I also think it looks neater jumpering E12 to E9. Be sure to use insulated wire though as per my pic in post #7, otherwise using a bare wire jumper comes close to E10.

The initial LED flicker on powerup says the board is seeing U6 (parts of) whose initial boot code tells the CPU to switch the LED off. After that point it is failing the ROM checksum test. Might be time to pull out a logic probe and cast your attention at U2.

As MarAlb mentioned, download the ROM code from IPDB or PPS incase the ones you got are not faithful.

Hard to tell but there's a small blob on E10 that might be touching your E9 connection:

Jumper_E10a.jpg

If the board was working and doesn't have (much) battery corrosion to deal with then there should be no reason it can't be revived.

Pull the ROM chips out and check that you're getting activity on all the address/data/chip enable pins at the U2 and U6 ROM sockets with a logic probe.

You could also consider reverting the jumpers and reinstalling the old original ROMs to see that there isn't some other problem now.

If the OP doesn't mind I have an EPROM question;

I'm looking up the difference between 27CP128 and 27C128.

I found the NSC data sheets and the only really difference I can tell between the two is the 27C has a faster access time and higher power consumption. Max power on the 27C is 360mW vs 55mW for the 27CP

Thoughts? Maybe I just had a bad chip when I tried substitution?

The NMC27CP128 is a strange beast. In fact it is a 27C256 Eprom, and you are programming the last block only - pin 27 is a "block select" which selects the lower or upper half of the array. In a 27C256 pin 27 is the the last a14 addressline.

Important is the programming voltage. The NMC27CP128 is based on CMOS technology and needs a programming voltage of 13volts. When choosing another programming algorithm meant for NMOS Eproms which need 21V a programming voltage you can destroy the chip and maybe your programmer.

Choosing a profile for a ST M27C128 -which needs a 12.75V programming voltage- will probably work fine for the NMC27CP128. You won't destroy anything with that.

Question: The National Semiconductor Corp lists the NMC27CP128 as a 16k x 8 part, is this correct? I can scan in the sheet and e-mail, I don't wish to clutter up the OP thread too much.

I'm looking to replace the factory installed 2.3V code with 2.4V downloaded from IPDB but the factory chip is 27CP128 and I'm looking to substitute. 27C256 should work if I double up the file size yes? Load it in the upper and lower section of the 27C256?

NMC27CP128 is listed as a 16k8 part. You can use a 27C256 also (in Data East games in socket 5A). You can double up the image OR you can load the 16kB image with an offset in a 32kB buffer -> start/loading addres/offset $4000.

Thank you, I will let you know how I make out tonight.

Bad chip I think, worked perfect the second time with a different 27C128.

Thank you for your help again!

No offense, but the soldering is so bad on those jumpers, who knows what's going on.

I created testroms for these boards which also provide you the possibilty to test the accessabiltity to socket U2. It can give you some more insights. Send me a PM with you email address if you would like to try them.

Try reburning those ROMs a couple of times (say about 3 times) without erasing between reburns, i.e. to top up the cell programming.

One of my cheap programmers programs 2716 EPROMs and it verifies them ok, but they don't work when put into use and other programmers show a fail on that verification. When I reprogram 3 times on the cheap programmer without erasing between reprograms, they then work ok. This is an (algorithm?) issue with my cheap programmer not the 2716 chips.