[Techtoolslist] 9010 Z-80 Pod Help needed

[Justin Johnson]

I swapped the Z80 and the 6532.  Here is the interesting part: When I  
swapped the Z80 no change but when I swapped the 6532 pin 28 of U4  
was now high.  I thought that was a good sign so I decided to run the  
self test again and it failed.  I then checked Pin 28 of U4 again and  
it was low again.  What I suspect is that when I purchased the new  
cables for the POD the guy shipped me a 8085  40 pin cable rather  
than the z-80 and pin 20 of the cable grounded. When I ohm out the 40  
pin cable pin 20 is connected to the ground lug that goes to the  
screw on the metal standoff.  The number on the 40 pin cable is  
685495. Can someone verify the cable number is correct?

Thanks

Justin



On Mar 9, 2013, at 10:50 PM, Rodger Boots wrote:


> Probably a better chance of the Z80 being bad (or pin 20 not  

> connected).

>

> On Sun, Mar 10, 2013 at 12:44 AM, Justin Johnson  

> <rugd2go at comcast.net>wrote:

>

>> I have a 6502 pod so I will try swapping the 6532 IC tomorrow and  

>> see what

>> happens.  If nothing else I can eliminate something.

>>

>> Thanks

>>

>> Justin

>>

>>

>>

>>

>> On Mar 9, 2013, at 10:33 PM, Rodger Boots wrote:

>>

>>  Rereading the original complaint it appears bit 3 (not bit 5) was  

>> failing.

>>> Bit 3 is IORQ (pin 20).

>>>

>>>

>>> On Sat, Mar 9, 2013 at 11:12 PM, David Shoemaker <davids at oz.net>  

>>> wrote:

>>>

>>>  Sounds like replacing the 6532 is in order (it's an IO chip).   

>>> Those are

>>>> used in all the pods I think so you could try a swap and see if  

>>>> that

>>>> fixes

>>>> the problem.

>>>>

>>>> -----Original Message-----

>>>> From: techtoolslist-bounces@**flippers.com<techtoolslist- 

>>>> bounces at flippers.com>

>>>> [mailto:techtoolslist-bounces@**flippers.com<techtoolslist- 

>>>> bounces at flippers.com>]

>>>> On Behalf Of Justin Johnson

>>>> Sent: Saturday, March 09, 2013 7:09 PM

>>>> To: Techtoolslist at flippers.com

>>>> Subject: [Techtoolslist] 9010 Z-80 Pod Help needed

>>>>

>>>> Hi Guys,

>>>>

>>>> I'm hoping I can find some help fixing my Z-80 Pod.  Here is the  

>>>> scoop

>>>> and

>>>> I

>>>> will try to make this short.  I purchased a Z-80 pod with the  

>>>> cables cut

>>>> off.  Found a new set of cables and tried a self test.  The self  

>>>> test

>>>> gave

>>>> me the failure code 00.  I then used a 40 pin socket and removed  

>>>> pin 29

>>>> as

>>>> suggested in the manual and placed the socket on the pod pins and

>>>> reinserted

>>>> the 40 pin connector into the pod for a bus test.  I then got a  

>>>> CTL ERR

>>>> 00000000 00001000- LooP.  As I understand it that shows an issue  

>>>> with

>>>> driving bit 5.  Am I correct that this is address and data line  

>>>> 5? I used

>>>> my

>>>> logic probe and probed the data lines of U4 or R6532AP.  I found  

>>>> that pin

>>>> 28

>>>> of

>>>> U4 which is the R6532AP has Data line 5  low while the other  

>>>> data lines

>>>> are

>>>> high.  Where do I go from here?  Any help or suggestions would be

>>>> appreciated.

>>>>

>>>> Thanks

>>>>

>>>> Justin

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