[Techtoolslist] Fluke 9010 bus test address tied message confusion

[Pat Danis]

I believe Raymond Jett has replacement cables for Fluke pods if that is indeed what you need. Channelmaniac at yahoo.com
Also www.arcadecomponents.com

Hope this helps

Pat

Sent from my iPhone

> On Jul 21, 2019, at 7:44 PM, David Shoemaker <davids at oz.net> wrote:
> 
> Ok so I got one of my SI boards working. And that let me figure out what was
> going on here.
> 
> The pod (twisted pair cable) would always show this error when doing bus
> test and ram reads / writes were flakey.  Any of my 3 boards.
> 
> I have 3 of the 8080 pods (two flat cable and this one twisted pair).  But
> the flat cable pods have never been able to work reliably with the midway
> 8080 boards for me.  Read 2000 loop would toggle values.  Obvious the
> address drivers were having trouble.
> 
> So I did some substitutions between pods.  Swapped the twisted pair cable
> over to one of the flat cable pods and WONDER of WONDERS.  The pod now will
> do a RUN UUT, and everything is golden, read / writes are fine now.  (Same
> board that is giving the A13 error).
> 
> So I swapped the CPU boards (and noticed something odd, the twisted pair pod
> has a different rom part number than the two flat cable pods).  No change,
> still A13.
> 
> OK so must be in the IO board.  Looked at the schematic and found A13 goes
> through the protection chip (praying that is not bad).  And from there to a
> 245.  Well those go bad, and there is another one on the board so I swapped
> them.
> 
> No more A13 error.  And looking at the schematic that buffer gate isn't used
> in the other location so it is "Fixed" for now.  Will look at getting some
> replacements for these in (not standard LS family).
> 
> I tried the flat cables with the clock resistors jumped and it didn't make
> any difference.  The twisted pair doesn't need them jumped.
> 
> At the end of the day all 3 pods work with the twisted pair cable.  But ONLY
> with that cable.
> 
> So where do I get new twisted pair cables for these?  Anyone?
> 
> David
> 
> -----Original Message-----
> Ok so I got one of my SI boards working. And that let me figure out what was
> going on here.
> 
> The pod (twisted pair cable) would always show this error when doing bus
> test and ram reads / writes were flakey.  Any of my 3 boards.
> 
> I have 3 of the 8080 pods (two flat cable and this one twisted pair).  But
> the flat cable pods have never been able to work reliably with the midway
> 8080 boards for me.  Read 2000 loop would toggle values.  Obvious the
> address drivers were having trouble.
> 
> So I did some substitutions between pods.  Swapped the twisted pair cable
> over to one of the flat cable pods and WONDER of WONDERS.  The pod now will
> do a RUN UUT, and everything is golden, read / writes are fine now.  (Same
> board that is giving the A13 error).
> 
> So I swapped the CPU boards (and noticed something odd, the twisted pair pod
> has a different rom part number than the two flat cable pods).  No change,
> still A13.
> 
> OK so must be in the IO board.  Looked at the schematic and found A13 goes
> through the protection chip (praying that is not bad).  And from there to a
> 245.  Well those go bad, and there is another one on the board so I swapped
> them.
> 
> No more A13 error.  And looking at the schematic that buffer gate isn't used
> in the other location so it is "Fixed" for now.  Will look at getting some
> replacements for these in (not standard LS family).
> 
> I tried the flat cables with the clock resistors jumped and it didn't make
> any difference.  The twisted pair doesn't need them jumped.
> 
> At the end of the day all 3 pods work with the twisted pair cable.  But ONLY
> with that cable.
> 
> So where do I get new twisted pair cables for these?  Anyone?
> 
> David
> 
> -----Original Message-----
> From: Techtoolslist [mailto:techtoolslist-bounces at flippers.com] On Behalf Of
> John Robertson
> Sent: Wednesday, July 10, 2019 6:41 AM
> To: techtoolslist at flippers.com
> Subject: Re: [Techtoolslist] Fluke 9010 bus test address tied message
> confusion
> 
>> On 2019/07/10 12:10 a.m., David Shoemaker wrote:
>> Working on a space invaders board.
>> 
>> 8080 pod, passes self-test.
>> 
>> Put it onto UUT and hit auto.  Getting an error that does make sense.
>> 
>> ADDR bits 13 tied-Loop?
>> 
>> Thought at first that was bits 1 & 3 tied.  But probing around didn't find
>> anything.  So I tried tying them together myself to see what happens.
>> 
>> ADDR Bits 1 and 3 tied - loop?
>> 
>> Uh, ok so they are explicit on the two bits tied.  That's good to know.
> But
>> why is it only telling me one bit?
>> 
>> So I pulled out the manual and from the bus test error messages table
> there
>> should never be a "bits" message without two bits.  But I am only getting
>> one (and no MORE led, and more button does nothing).
>> 
>> The only single bit error should be if bit tied low or high. But that is
> not
>> the message (and it says "bit" not "bits").
>> 
>> I tried exercising bit 13, did a write @ 2000 = 0, probe set on address
> and
>> can see the line being driven high.  And no other bits are being driven
> when
>> I check.
>> 
>> Thoughts?
>> 
>> 
>> 
>> Thanks,
>> 
>> David
>> 
>> 
> When I get these errors (not specific about what it is tied too) I 
> search the entire line and usually find it is shorted to something the 
> CPU has no connection to. For example on the SI board - do you have the 
> sub-board unplugged? Take a look in the socket for junk/bent pin 
> shorting A13 to some other line (if A13 goes to that socket). This error 
> simply means that the Fluke can't exercise A13 easily and it assumes it 
> is stuck to some other line that the pod can't 'see'.
> 
> Have you done a Diode Test to compare A13/Vcc/GND results with A12 or 
> A14? They should be the same with the Fluke pod disconnected.
> 
> John :-#)#
> 
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