[time-nuts] 5371A problem

[wje]

   I don't think so. Not only is this not documented in the manual, the
   lines aren't complete. There tend to be missing pixels; sometimes there
   are only a few pixels in a line. But, the lines are always horizontal,
   and typically occur every 1/4 to 1/6 or so of the vertical span, but
   don't seem to have any correlation with the actual vertical scale
   divisions.
   I'm wondering if the rams are suffering from pattern sensitivity
   failures. This used to be a reasonably common problem where writing to
   one address would also write to bits in other RAM rows (or columns,
   depending upon the ram design).
Bill Ezell
----------
They said 'Windows or better'
so I used Linux.

   WB6BNQ wrote:

Bill,

Are you sure that they are not suppose to be there ?  In otherwords  like a mino
r axis/division indicator ?

Just a thought.

Bill....WB6BNQ

wje wrote:



The dot are aligned horizontally, only a single scan line per set of
dots. However, this only shows up in graph mode, not in any other
display. The dots are actually in memory. If I plot the graph, they show
up in the plot also.

Bill Ezell
----------
They said 'Windows or better'
so I used Linux.

Mark Sims wrote:


It may be related to video not being blanked properly during the vertical retrac
e on the CRT... particularly if the dots on each row seem to be regularly aligne
d (either vertically or most likely skewed).

If the vertical retrace signal lasts for five horizontal scan line times,  you w
ould see five lines of pseudo video garbage during the vertical retrace.  You mi
ght only see the video garbage if the average amplitude of the video signal exce
eded some threshold (which apparently occurs when the graph exceeds a certain si
ze).

Try displaying one of those wordy help screens or a display with "bold" values e
nabled and see if the problem appears there.

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