Asteroids deluxe messed up vectors

omegaman

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Hi Guys

Im working on my Asty deluxe and having problems finding the cause of this problem. In test mode the cross hatch is pretty messed up...pictures can be seen here

http://s32.photobucket.com/albums/d...s deluxe/?action=view&current=29062010047.jpg

In game play the asteroids and other moving objects have lines running off them, like this-

http://s32.photobucket.com/albums/d...s deluxe/?action=view&current=29062010046.jpg

I'm thinking it may be one of the 74191 counters.

Any ideas?

Thanks
 
It's an HP 10529A, that and an ABI digital IC tester like this http://uk.farnell.com/jsp/displayProduct.jsp?sku=1296492&CMP=e-2072-00001000

I couldn't imagine trying to fix a board without these tools now.

Sometimes the comparator will show problems that don't exist depending on the Chip being tested and how its connected in circuit, most of the time though it picks up problems that can't been seen with a logic probe.
 
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