From: nospam@acme.com   
      
   Am 10.01.2025 um 02:03 schrieb Jan Ernst Voß:   
   > Thanks for your replies!   
   >   
   > To say the truth, i am not really new to this group, but that's been   
   > more than 30 years ago.   
   >   
   > Over the time, i owned 67 pinball games, all of them but the first one,   
   > a Gottlieb's "Super Soccer" had failures. I've searched the "Super   
   > Soccer" about a zillion to find the bad zero switch at the drum units. I   
   > was 15 at this time, now i'm 62 years old.   
   >   
   > I repaired more than 100 machines, EM and SS as well.   
   >   
   > But games build by Playmatic are special: they use CMOS instead of TTL   
   > logic.   
   >   
   > I bought a Big Town in 1987. The price was cheap, 70 DM (around 35$).   
   > Both RAMs, both ROMs, and the CPU were dead.   
   >   
   > And other chips on the MPU were dead. I was able to get another machine   
   > month later. It had good ROMs. This game was cheaper, 50 DM (around   
   > 25$). I build a small circuit, using just 8 IS to do the job of the 1834   
   > ROMs.   
   >   
   > The ROMs were replaced by an EPROM 2716. The game went in attract mode   
   > at once. Both games had a bad 74C42 on the decoder.   
   >   
   > Due to my job, i know most assembly languages of former machines. The   
   > knowledge about these, i've made a "diagnostic board" for the   
   > Playmatics, which was very helpful to find errors in the MPU of the games.   
   >   
   > Now I have 2 bad "Big Town". Both are faulty.   
   >   
   > 1) Does not recognize contacts other than the coins, the credit, the   
   > ball resting, reset, and the test buttons.   
   >   
   > 2) Shows irretating scores. "20" is the high score to date, new games   
   > start with 200.020 points.   
   >   
   > That's it.   
   >   
   > Kind regards,   
   > Jan   
   Just to correct an error: the year was 1997, not 1987.   
      
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