Re: Asteroids X axis problem

>If adjusting the x-axis size changes the results then the problem
>area is around the X-Axis size control and related ICs or later (no
>schematic on hand).
>
>You did say that you tried a later board and no problem on the
>monitor - that lets the monitor and power supplies out.

Indeed. I'll either put up with it (and simply reduce the screen size
a bit) or swap out a few more parts.

Ta for the advice. :-)
Phil

>>>Do you have a picture?
>>
>>Afraid not, not much to see really though, just a vertical line the
>>height of the object as it passes through the edge of the screen
>>(the object is still drawn okay though).
>>
>>
>>Thanks,
>>Phil
>>
>>
>>
>>>
>>>-Mark
>>>
>>>
>>>
>>>Just been fixing up my first Asteroids board for ages - multiple
>>>problems, all now fixed ......... except for one.
>>>
>>>Whenever an object gets to the far left or right edges of the
>>>display it's still drawn okay BUT as the object passes through the
>>>edge it makes a vertical line at that edge where the object is
>>>passing through - the line is same 'height' as the object too.
>>>
>>>Now I've seen something similar before which was caused by a
>>>problem with the UNMDACX12 signal, but in this case that's not the
>>>problem as changing the relevant chips (7404 at H10 and LS191 at
>>>C9) doesn't fix the fault.
>>>
>>>This is an early Rev 2 board.
>>>
>>>Could of course be the AD561 DAC, or the TL081 or TL082 in the X
>>>axis output circuit, but is there anything else that I've missed
>>>before I go swapping out multiple chips? I can't unfortunately see
>>>any faults when I 'scope out the signals.
>>>
>>>
>>>Thanks,
>>>Phil
>>>
>>>
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>
>
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Received on Fri Mar 12 12:36:54 2010