Michael Roma
Active member
I picked up a JD recently and it had the L4 ROM. I went to IPDB, downloaded the L7 ROM, burned and installed. The games seems to play somewhat normally (first ball in plays fires two balls and instant replay awarded) but when I go into the diagnostics to run some tests it acts strange.
For instance when I go into the solenoid tests the planet and magnet arm move ever-so-slightly, over and over no matter what solenoid is selected to test and the selected solenoid to test never fires. But when I play a game all solenoids fire when they should.
I know the trough optos are known for shooting out multiple balls but I checked for cold solder joints and it didn't do it on the L4 ROM so I think it is safe to rule that out.
One thing I did notice is that on IPDB there is the 'Game ROM L-7' and then the 'PinMAME RomSet (L-7)' (which has the game ROM and sound ROMs). I downloaded both and noticed that the game ROM alone is 386KB while the PinMAME game ROM is 365KB.
I guess my question is why the discrepancy between the PinMAME and regular game ROM sizes?
- Mike
For instance when I go into the solenoid tests the planet and magnet arm move ever-so-slightly, over and over no matter what solenoid is selected to test and the selected solenoid to test never fires. But when I play a game all solenoids fire when they should.
I know the trough optos are known for shooting out multiple balls but I checked for cold solder joints and it didn't do it on the L4 ROM so I think it is safe to rule that out.
One thing I did notice is that on IPDB there is the 'Game ROM L-7' and then the 'PinMAME RomSet (L-7)' (which has the game ROM and sound ROMs). I downloaded both and noticed that the game ROM alone is 386KB while the PinMAME game ROM is 365KB.
I guess my question is why the discrepancy between the PinMAME and regular game ROM sizes?
- Mike