Money Money by Zaccaria

[Robinholland]

lines are mostly defect ram memory
What ram's are on the pcb ?
To low 5 volt can also give lines in sprites !
Do you have close pictures of the pcb ?
Nice pcb by the way  

[PaulSwan]

The object RAM is 2114 but this PCB does not have sprite location or selection issues that it looks like this RAM is used for. The sprite data is missing a horizontal line. I'd be looking around IC's 2D-2G for dead lines (EV1-8 to the E0-E2 calculation).

If you want to start learning how to repair a PCB jail bars is a great fault to start with because it's usually easy to find

Paul.

[Robinholland]

2148 ram at 7E , 7D , 7K , 7L are the sprites ram ( i think  )
piggyback them and see of the lines are gone
check also
74ls244    7c , 7m
74ls86      7a , 8a , 7p , 8p
74ls374    7b , 7n

[Robinholland]

The object RAM is 2114 but this PCB does not have sprite location or selection issues that it looks like this RAM is used for. The sprite data is missing a horizontal line. I'd be looking around IC's 2D-2G for dead lines (EV1-8 to the E0-E2 calculation).

If you want to start learning how to repair a PCB jail bars is a great fault to start with because it's usually easy to find

Paul.

2114 ram's are mostly not for the moving object if there are 2148(9) rams on the pcb

[Belike]

Huh, so much info for a noob like me, but I will have to learn this.
Btw. what does it mean "piggyback"?

[Robinholland]

 
i make a picture for you  
You put a new ic to a old ic
It work not alway's !

[PaulSwan]

Could be the sprite out post processing as Robin suggested - be easier to investigate with a video probe (that's a probe that's attached to one of the colour inputs of the monitor so you can see the signal in relation to the picture on the screen).

Since a nice collection of inputs and outputs are connected to the 2 82S100's (8C & 8N) you may be able to work out which line is out.

Fingers crossed it's not the 82S100 :|

Paul.

[level42]

Heheh, the first time I read the word "Piggy back" was when we were doing hack-yourself memory upgrades on our Atari 8 bits
But then it was a definite piggy back, with some select pins folded up and wired separately.

Until five seconds ago, I never understood where the term "piggy back" came from, but it turns out that it has nothing to do with pigs:

http://en.wikipedia.org/wiki/Piggy-back_(transportation)

[2-mad]

Hm.. Is a Piggi-Back something like this ?

[2-mad]

And in germany the define piggyback with THIS :#

[Etienne MacGyver]

Heheh, the first time I read the word "Piggy back" was when we were doing hack-yourself memory upgrades on our Atari 8 bits
But then it was a definite piggy back, with some select pins folded up and wired separately.

Until five seconds ago, I never understood where the term "piggy back" came from, but it turns out that it has nothing to do with pigs:

http://en.wikipedia.org/wiki/Piggy-back_(transportation)

Interesting, never knew that term..

i was reading too fast, so i read piggy bank instead of back  

anyway, great way to test it without having to desolder / cut out a possible good IC !

very clever !

[Belike]

2148 ram at 7E , 7D , 7K , 7L are the sprites ram ( i think  )
piggyback them and see of the lines are gone
check also
74ls244    7c , 7m
74ls86      7a , 8a , 7p , 8p
74ls374    7b , 7n

Thanks Robin, seems like the 74... chips are available here for a few forints and I try to find a local source also for the 2148 somehow.

[2-mad]

Thanks Robin, seems like the 74... chips are available here for a few forints and I try to find a local source also for the 2148 somehow.

The easiest way to check the 74xx series is using a logic analyzer.
This kind of "Digi-Tech" is really easy ..

[Robinholland]

For the price of a logic analyzer you have 8 money money pcb's 

[PaulSwan]

Yes, it's a personal preference, but I never use my logic analyser. Almost all 74 series can be worked out as bad with a scope. For counters & shift registers that are suspect it's quicker to just replace them.

I've heard a comparator also works well and is fast for 74 diagnosis.

Finding 8 Money Money PCB's is a bit of a challenge

Paul.