U18 & U20 does all 5500 software work on 6000 boards?

[Badbaud]

Working on a 6000 board, Triple Blazing 7's diamond line.

The SMI is 8027.

The board plays fine on the tester for about 3 games then displays a 80 code.

Clear is hard to do and takes 3 or more tries to get the CHC and CLC, otherwise I get fast flashing lamps and no display.

After a clear the game will play for a while and give another 80 code.

I put  the software into another known good board and kept getting the same results.

The software was gotten from our library of 5500 chips.

Is this why I am getting 80 codes?

Can any 5500 chip set be put into a 6000 board or are there certain SMI numbers that are not compatible?

Or are the 8027 chips I used defective?

Unfortunately 8027 was the only set I had to try.

The game will play with 8026 through 8031 SMI's and I was wondering if anyone had another set, within the range 0f 26 through 31,   that I could try?