Oct 282018
 

Received a pacland board for a repair which was stuck with a  0 2 0 error at boot.

Normally the middle digit means it’s an program rom error and infact the second prg rom @8D had no sticker  and I immediately checked it.

 

Romident showed it was a Pacland midway rom, but the other prg roms belonged to the japanes new version.

After burning the correct 2nd rom from the jap set I was welcomed with this screen which is the service one.

The dipswitches were all set OFF and after verifying they were working correctly I decided to change all the FUJITSU 74LS257 near them which had dead outputs infact.

In the end all the Fujistsu chips has been changed because faulty: @1L, 2L and 2J!

 

With good ones changed the game finally booted but the palette was very tinted and the sprites were corrupted:

 

Verifying the sprites roms 8,9,10 and 11 these were a mess of different revisions, so using a broken pacland I put the matching roms from the new japanese set

Still the sprites were corrupted and eventually I found a bad 74ls86 ( again Fujitsu) @10F

 

With good one installed I got finally good sprites but still the palette was tinted:

 

I proceeded on the colour prom section and found that the chip PL1-2 had some outputs dead

 

Using one from another Pacland board fixed the game 100%