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<DIV><SPAN class=094303314-09102003><FONT face=Arial color=#0000ff size=2>To
reiterate what Kev has touched on, often in the case of screen ram (and indeed
rom). It is not desinged to be read, only written .</FONT></SPAN></DIV>
<DIV><SPAN class=094303314-09102003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=094303314-09102003><FONT face=Arial color=#0000ff size=2>Take a
Galaxian board.</FONT></SPAN></DIV>
<DIV><SPAN class=094303314-09102003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=094303314-09102003><FONT face=Arial color=#0000ff size=2>The
program only writes to the video ram. A completely independent set of logic
based (not microprocessor controlled) hardware then reads this ram, accesses the
object roms and dumps the contents to the screen. It never reads back what it's
put on the screen. Hence, again to use Galaxian as an example, there are also
two ROMs that you can't test using the Fluke because they are not
within the space addressable by the processor.</FONT></SPAN></DIV>
<DIV><SPAN class=094303314-09102003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=094303314-09102003><FONT face=Arial color=#0000ff size=2>One of
the first mistakes i bumped into a few months ago :O)</FONT></SPAN></DIV>
<DIV><SPAN class=094303314-09102003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=094303314-09102003><FONT face=Arial color=#0000ff
size=2>Martin</FONT></SPAN></DIV>
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<DIV></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT
face=Tahoma size=2>-----Original Message-----<BR><B>From:</B>
owner-techtoolslist@www.flippers.com
[mailto:owner-techtoolslist@www.flippers.com] <B>On Behalf Of </B>James
Bright<BR><B>Sent:</B> 09 October 2003 14:25<BR><B>To:</B>
techtoolslist@www.flippers.com<BR><B>Subject:</B> Re: [techtoolslist] Frogger
testing on Fluke 9010A<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2>Couple quick suggestions (I have not looked at
this board yet):</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>1) Are you able to Run UUT? I always try this to
make sure that my pod works in the board. That is just a safety
check.</FONT></DIV>
<DIV><FONT face=Arial size=2>2) Do you have a probe? With a probe you can
confirm that you've mapped the right address to the right chip. What you can
do is something (manual from the keypad) like: </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2> SYNC ADDRESS</FONT></DIV>
<DIV><FONT face=Arial size=2> WRITE @ <suspected start
address></FONT></DIV>
<DIV><FONT face=Arial size=2> LOOP</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>and then you can probe the 2114 at the chip
enable pin to ensure that the chip you is indeed getting selected. In
your case, I don't think it is. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Also 2114s (for one hi/lo 2114 pair), the test
range will be something like 0000 - 03FF. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>--James Bright<BR><A
href="http://www.QuarterArcade.com">www.QuarterArcade.com</A><BR>Restored
Arcade Games for your Home<BR></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=pc2jamma@terra.com.br
href="mailto:pc2jamma@terra.com.br">pc2jamma</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=techtoolslist@www.flippers.com
href="mailto:techtoolslist@www.flippers.com">techtoolslist</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, October 08, 2003 10:09
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [techtoolslist] Frogger
testing on Fluke 9010A</DIV>
<DIV><BR></DIV>
<DIV>Hi guys !</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>I'm facing one problem that is driving me crazy !</DIV>
<DIV> </DIV>
<DIV>I have one 9010A with Z80QT Pod, I'm testing one known good Frogger
(Sega Gremlin) board. So far so good ! But "the problem is" : I have one
2114 sockted at position 50, and does not matter if I remove this IC or
replace with a damage one, it passes on both short and long RAM Test... I
also did the Quick Test and nope.</DIV>
<DIV> </DIV>
<DIV>I'm testing the following addresses:</DIV>
<DIV> </DIV>
<DIV>8000h-87FFh Passes OK</DIV>
<DIV>A800h-ABFFh Passes OK</DIV>
<DIV>AC00h-AFFFh Passes OK</DIV>
<DIV> </DIV>
<DIV>I think there is something wrong on addresses... but I don't know the
right ones... According to James's website the addresses are Okay, instead
of AC00h-AFFFh that is not listed on the website.</DIV>
<DIV> </DIV>
<DIV>Some of you guys can help me on that please ?</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>Thank you very much !</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>José Luiz Martins</DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>
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Received on Thu Oct 09 09:19:34 2003
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