Missle Command and Fluke 9010

From: David Shoemaker <davids_at_oz.net>
Date: Sun Nov 10 2002 - 22:54:51 EST

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<DIV><FONT face=Arial size=2>Anyone used these together?&nbsp; There appears to
be some odd bank switching to the ram&nbsp;and I can't quite get a handle on
it.&nbsp; Have a board that watch dogs constantly.</FONT></DIV>
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<DIV><FONT face=Arial size=2>As far as I can see there is something wrong in the
DRAM address selector.&nbsp; Pin 8 of the LS10 @ E3 never changes.&nbsp; I piggy
backed another chip on it with pin 8 pulled up and it also gave the same
result.&nbsp; As far as I can see all the inputs to that area are correct but I
am wondering about ~IRQH which is the hardware interrupt signal.&nbsp; There is
a note on the schematics that this signal will disable the DRAM address
controller from setting the MADSEL.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Tracking ~IRQH back to its source it appears that
16FLIP is triggering which leads me to FLIP which is triggering.&nbsp; Now I
wouldn't expect FLIP to fire unless I had the cocktail strap in.&nbsp; Plus I am
running -01 roms which don't even support FLIP.</FONT></DIV>
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<DIV><FONT face=Arial size=2>As you can probably guess I am going in circles
just a bit.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Ideas?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>David</FONT></DIV>
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Received on Sun Nov 10 22:29:40 2002

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