Re: Catbox, Catbox Sigs

Kevin Moore wrote:
> Thanks for providing the sig, I was about to run calcsignature to get it.
>
> Anyways, Rom test came back as 0000, and since I know the rom is good
> that can't be right :(
>
> How well do the flukes do the bus test? Since I've not ran into a
> situation where the bus test has failed before.
>
> Ram test are showing faults but that may be due to some other problem.
>
> Haven't had a chance to fully get into this guy yet, but wanted to let
> you guys know what little progress I've made :)
>
> Kevin

The BUS test (Fluke 9010A) is pretty good. It shows when address or data
lines are stuck high, low or shorted together or to ground or Vcc. It
also monitors Reset, NMI and any other CPU controlling inputs.

Rom test of 0000 is interesting as I recall a blank 2K x 8 Eprom is
something like 56xx. 0000 sounds like data lines shorted to ground. Have
you tried reading any of the Eproms addresses? You should see some data
in most of the addresses occupied by the Eprom, certainly the last few
addresses will be occupied as they are the Reset and NMI vectors for the
6502 CPU.

John :-#)#

>
>
> On Tue, Feb 2, 2010 at 2:24 PM, John Robertson <pinball@telus.net
> <mailto:pinball@telus.net>> wrote:
>
> Kevin Moore wrote:
>> Haven't run the Fluke on it, but everything else. I'm assuming
>> it's probably an addressing problem.
>>
>> Thanks,
>>
>> Kevin
>>
> Considering the simplicity of the CatBox running the 9010A with
> the 6502 pod should show the problem up in seconds.
>
> The CatBox Eprom Fluke signature should be "B2DB" for the Checksum
> version of the software - all versions (except my prototype Cat
> Box) as far as I know are Checksum versions.
>
>
> John :-#)#
>>
>> On Tue, Feb 2, 2010 at 11:52 AM, John Robertson
>> <pinball@telus.net <mailto:pinball@telus.net>> wrote:
>>
>> Kevin Moore wrote:
>>> Thanks, I have all that. I was just wondering if they had
>>> done a sig analysis profile. Before I start hitting it with
>>> the logic probe :)
>>>
>>>
>> Ah, no, not to my knowledge. I usually fire up the Fluke 9010
>> about this time with non-working CPU based equipment... If
>> you have a second Cat Box you can use that to troubleshoot
>> the sick one...
>>
>> I would start (after verifying proper voltages) with
>> substituting the RAM, then the CPU and finally the Eprom.
>> This is the order I find failures in most CPU based equipment.
>>
>> If there are PROMs, then they are about as suspicious as RAM,
>> however no PROMs in the Cat Box. ROMs are almost as reliable
>> as Eproms in my experience.
>>
>> John :-#)#
>>
>>>
>>> On Tue, Feb 2, 2010 at 11:06 AM, John Robertson
>>> <pinball@telus.net <mailto:pinball@telus.net>> wrote:
>>>
>>> Kevin Moore wrote:
>>>
>>> Is there a Catbox Sig manual for the Catbox, or for
>>> that matter one using an HP5004a to do sigs on the
>>> catbox?
>>>
>>> I've got another cat box that the logic board isn't
>>> running.
>>>
>>> Thanks,
>>>
>>> Kevin
>>>
>>> Hi Kevin,
>>>
>>> I have a scan of the Atari CAT BOX book, includes
>>> schematic - its up on Tech Tools List FTP site under CAT
>>> BOX...
>>>
>>> FTP site is: ftp://ftp.flippers.com/TTL/TestEquipment
>>>
>>> Mail List Archive site:
>>> http://seven.pairlist.net/pipermail/techtoolslist/
>>>
>>> Hope that helps! ROM images, POD sheets, etc. also found
>>> there...
>>>
>>> John :-#)#
>>>
>>> --
>>> John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada
>>> V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs,
>>> Jukes, VideoGames)
>>> www.flippers.com
>>> <http://www.flippers.com> "Old pinballers never die,
>>> they just flip out"
>>>
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>>>
>>
>>
>> --
>> John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
>> Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
>> www.flippers.com <http://www.flippers.com>
>> "Old pinballers never die, they just flip out"
>>
>>
>>
>
>
> --
> John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
> Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
> www.flippers.com <http://www.flippers.com>
> "Old pinballers never die, they just flip out"
>
>
>

-- 
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
                 www.flippers.com 
"Old pinballers never die, they just flip out"
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