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Well, I've been trying to interpret the coding to the Pod from the base
unit using a really nice software/hardware tool called SoftLA. Software
Logic Analyzer is what it is, 16 channels! You can get it from
<a href="http://www.bgmicro.com/" eudora="autourl">www.</a>BGMicro<a href="http://www.bgmicro.com/" eudora="autourl">.com</a>
for about $30US. <br><br>
See http://www.bgmicro.com/pdf/page14.pdf for a write-up.<br><br>
Now when I set up the base and pod and have the SoftLA monitor the POD 0 - 7 and MAINSTAT, PODSTAT, RESET, POWERFAIL, and also monitor Chip Select (pin 23) & ENable (pin 25 - normally Phase 2) on the select side of the 6520 PIA I get some curious results.<br><br>
If I tell the Pod to do a BUS test, and I use CS as the trigger point I get a RESET <b><i><u>BEFORE </u></i></b>the 6520 is SELECTED...psychic...it knows it is wanted. Is anyone here more familiar with the programming ins and outs of the 6520? I think FLUKE might have used an undocumented (in my reference book by Rockwell) data call to the PIA that seems to enable PORT A to output data WITHOUT the CS or EN.<br><br>
If the PIA is only communicating when both CS and EN are set, then there aren't that many instructions...if it is when there is some sort of chatter via PORT A that does NOT involve CS or EN then I think some disassembly of the base code is going to be required...Gah!<br><br>
John :-#)#</html>
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Received on Mon Mar 04 22:28:55 2002
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