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Updated slightly as per some questions raised in email...<br><br>
I was tinkering around with a sick Bally MPU board today (a rewired -17
monster for Grand Products 301), and was trying to figure out why the
6810 was not being selected...So I set the probe to <i><u>SYNC to</u></i>
DATA <i><u>(or ADDRESS)</u>,</i> and set a WRITE @ 0000 = 55
<i><u>(LOOPING)</u></i>, and then tried checking with the
<i><u>9010A's</u></i> probe for results. Curiously enough, the
<i><u>Synched</u></i> probe showed nothing at all for A7 - Tri-State as
far as it was concerned. I though maybe the 6800 pod was defective and
pulled out another one, same result. A regular logic probe shows
everything active. <i>Need to dig out the scope next I guess...<br><br>
</i>The 6810 RAM should have been available from 0000h to 007Fh, but it
was invisible. The 6810 is good, as is the socket and wiring...curious...
shall dig around more tomorrow when had more sleep and let you folks know
the results.<br><br>
A FAQ on the 9010A might be in order at some point...<br><br>
Suggestions?<br><br>
John :-#)#<br><br>
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Received on Tue Mar 25 22:06:32 2003
This archive was generated by hypermail 2.1.8 : Tue Dec 02 2003 - 18:40:51 EST