<x-html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2800.1106" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>Anyone used these together? There appears to
be some odd bank switching to the ram and I can't quite get a handle on
it. Have a board that watch dogs constantly.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>As far as I can see there is something wrong in the
DRAM address selector. Pin 8 of the LS10 @ E3 never changes. I piggy
backed another chip on it with pin 8 pulled up and it also gave the same
result. 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. 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> </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. Now I
wouldn't expect FLIP to fire unless I had the cocktail strap in. Plus I am
running -01 roms which don't even support FLIP.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<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> </DIV>
<DIV><FONT face=Arial size=2>Ideas?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>David</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV></BODY></HTML>
</x-html>
Received on Sun Nov 10 22:29:40 2002
This archive was generated by hypermail 2.1.8 : Tue Dec 02 2003 - 17:51:31 EST