The above should work, see below for Hang On.
https://forums.arcade-museum.com/threads/smarty-pi-hang-on-dip-switch-settings-how-do-you-change-them.557352/#post-5034943
p
The DEV test writes to RAM and checks it, it’s possible that some area of the RAM is bad, I guess you will need to play a game to check it out. Or, change with a known good one and see if it passes.
Good job on figuring the issues out!
p
This game came out in 88, Konami filed the trademark for MIA in Jan of 89 (I could not find any other regions for this TM). It is possible that that Data East was aware of Konami's MIA game being developed and did not want to get into any fights over the title (especially since Konami was a lot...