Quoted from frunch:
Congrats on the fix! Could you elaborate a bit on the solution? I've been following this thread for a while, you've done some nice work. Beautiful game, I hope to add one to my collection someday...
I can but ask that no hasty assumptions be made.
1) Arrived home from work, popped in the 4096 chip and the Weebly ram and fired the machine up. Much to my displeasure I was greeted with an 8 in the credit window and 888,888 for high score just as before. Broke out the logic probe which now showed activity on leg 8 and 9 of the 4096 chip and activity on the ram on all legs aside from power and ground. But starting the machine several times, clearing audits made no difference and on-board diag test indicated no ram problems!
2) Took the original unknown condition 5101 ram chip and popped it in and started the machine up- Now I had 0 for credits and a different high score! Most excellent, some progress. I cleared the audits so high score was 0 and added credits to the machine and played a few games. The machine would display the correct high score, indeed it would even retain it if the machine was shut off for a minute (remember, no battery) but credits would zero out after a game. Every time.
3) So I did something I rarely do because sooner or later it causes problems. I went over to my Gold Wings and pulled the Pintech NVRAM out and installed the Weebly ram. The Weebly ram works perfect in the Gold Wings, but did not in Haunted House.
4) Installed the Pintech ram in Haunted House, Haunted House now works perfect. Retains credits and high score proper.
Very, Very odd.