Justin Johnson wrote:
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
According to the Z80 pod manual (up on the TTL archives) the correct flat (not-twisted) cable (W2) is 585141 - the same as the one used for the 6502 and 6802/8. The 6800 uses UUT cable 685479. The 6809 & 8051 uses UUT (twisted) shielded cable 680595 The 8080 uses UUT cable 680603 The Z80QT uses shielded UUT cable 685461 The Z8000 uses shielded UUT cable 650432 The twisted pair UUT cables are NOT interchangeable due to various pins being tied to ground. Not sure if the flat UUT cables have shared grounded pins but I suspect so... John :-#)#
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@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@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@flippers.com>
[mailto:techtoolslist-bounces@**flippers.com<techtoolslist-bounces@flippers.com>]
On Behalf Of Justin Johnson Sent: Saturday, March 09, 2013 7:09 PM To: Techtoolslist@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
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