I am at a loss with this Mpu board, this is my spare board which I work on from time to time.
Here is my problems:
Booking is not being saved, when I go through the tests it don’t show the quarters in shoot 1 nor shoot 2
I’ll set replay at 210,000 280,000 and 350,000 and high score at 400,000
When I run through the test 7-10 it saves 10,001 for 1st replay 0 for 2nd replay 10,001 for 3rdand 10,001 for high score.
Another odditiy is when I shut it off and turn it back on the credits show 33 and match 70 which isn’t bad but it will only accept 1 credit more no matter how many quarters I put in. The chimes work as though I’m adding credits but only 1 credit is added. Here is the chips I had changed out thus far:
Z22, Z5 Z2 C22 C27 Q5 and Q6
I should note I have a battery pack (3 AA) with diode on positive with band towards the board.
Please any advice (besides tossing out the board) will be appreciated