My first Bally 6803 game/project is this MotorDome.
Installed a new 6803 MPU board pretested w/ MotorDome EPROMS and NVRAM (Nice work Fred Swemmer!)
Game will boot up and thank goodness the displays all work!
However I get two errors before game will full boot into attract mode.
RIGHT BUMPER and TOP LANE P.
I'm guessing there are switch errors on those two for now but when the game boots and the DISPLAYS start spelli8ng out 1-4 Players Can Play. Insert Quarters.etc.

I toggle the coin door credit switch and get no response..from either switch.

Haven't educated myself on the NUMPAD ALPHA interface pad..how to use it.

Should the game at least start with the two switch errors or do they need to be resolved for it to start a game?

Thanks!

I've got some reading to do for sure..Not sure how to install Factory Defaults yet bu I'm sure it's in the manual.
The coin door tiny little micro button works to end the switch test.

Once the game is "booted" with the two closed switches, how would I set it to free play or can I?

Sorry for such a basic question. The digital pad is working when I tried it the other day. Not sure what to do with it yet.
Newbie on this 6803 still.

Worked with this pin tonight.

As I mentioned earlier in the thread, I installed a new Swemmer 6803 MPU/DRIVER board with NVRAM.

Game boots up, stalls at the two closed switch error on displays for a bit, then goes on to attract mode.

When I press the test switch inside the coindoor (next to volume control) , switch test will start again and display the two problem switches. The displays tell me to press TEST again to end the test. I press the button but the test will not exit.
I know the switch was pressed as the display will jump to switch test on the displays as thou I started it but the only way to exit is to power down.

Acebathound, you mention to press TEST on the keypad in the compatibility link (NVRAM) but there is no TEST button on it.

When I try the coin slot drop switches to try to add credits, the switch test will show the right and left coin chute/slot closed when I hold it down. But no credits will add. I'm not even sure if there is a way to set FreePlay on this model (I am a dinosaur on this model) so far.

Not sure if the issue is the NVRAM not able to let me factory reset the game or if there is some other issue. Suggestions are welcomed!

Acebathound,
Thanks for the info. I read up on it in the manual from your link. I also downloaded a copy for reference.
I guess I will take care of those two switches that are stuck closed first.
I am not sure if that is the issue why I cannot exit SWITCH TEST without powering down.
I mean SWITCH TEST sees the ball in the OUTHOLE so that's supposed to be there before a game would start.
Not sure the keypad I have is 100% either. After powering up pin and it's in ATTRACT MODE, if I press the upper left button on the keypad, it toggles the hole eject solenoid in the far upper right of the playfield. Not sure if that's normal..

Update: spent a few hours today trying to figure out why I get message that the Top Lane "P" is CLOSED and the RIGHT POP BUMPER is CLOSED. Inspection shows they are not CLOSED.
Also cannot exit Switch Test either. I have to turn pin off/then on.
Please watch this video if you choose and see if you have any revelations that I need to know. I am 6803 SYSTEM uneducated at this point.

I am so sorry I had phone sideways but I am not near the pin to redo the video.

Thank you!!!

Will try it and let you know what I get. Does it make a difference that this board has NVRAM vs BATTERY in trying to reset it?
The board was tested in a Special Forces w/ NVRAM before it came to me. Could that be why I can't get into the FACTORY RESET?

Can't help the way the board came. I like the fact it has the NVRAM but feel it's causing my issue resetting the factory defaults.
I can easily pull off the NVRAM but I don't have the original RAM chip to put back in it's place.
I also would have to solder on a battery coin cell holder or external battery (Board has connectors).
I am speculating here but I think the NVRAM still has settings programmed in it for Special Forces. Why would the upper right
solenoid fire when I press GAME on the keypad? What should the game do when that is pressed?

I haven't had a chance to try your earlier suggestion on pulling J4 connector but I will tonight. The game is not at my place but 4 miles up the street.

https://ksarcade.net/swemmer-6803mpu.html

Update:
---------
I made some progress tonight.
I pulled Connector J4 off the MPU board like cfh suggested and powered up so I could get into the settings. PAD responded and I reset game to factory defaults w/ CODE 65 in Basic Settings.
I was able to do it finally!

So game is running now. I don't have errors on those two switches anymore so it was have been a CATCH-22 where I couldn't reset the NVRAM unless I pulled the J4 temporarily to accomplish.

Game is rough..it needs some love but in pretty good shape.
I have NO SOUND though. Should the LED on the SOUND BOARD stay ON or just blink 3 times at power up?