[Coco] coco xt-rtc adapter by Burke and Burke(FromTandyCoCoForums)

[Stephen H. Fischer]

Hi,

I see no battery, but two pads (appear to never have had anything connected 
to them) the left one with a "+".

As one appears to be connected to ground, and the other to a pin on the 
smart watch, adding a battery looks good. (IC's made in 1989 for the SW and 
1984 for other two ICs)

I found quickly battery holders for CR2032 and one with tabs.

I see no other parts on the board that may be too old.

SHF

----- Original Message ----- 
From: "Bob Devries" <devries.bob at gmail.com>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Sunday, April 07, 2013 10:03 PM
Subject: Re: [Coco] coco xt-rtc adapter by Burke and 
Burke(FromTandyCoCoForums)


> Stephen,
>
> The Dallas DS1215 used an externally connected battery, usually a CR2032.
>
> Regards, Bob Devries
> Dalby, QLD, Australia
>
> ----- Original Message ----- 
> From: "Stephen H. Fischer" <SFischer1 at Mindspring.com>
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> Sent: Monday, April 08, 2013 2:58 PM
> Subject: Re: [Coco] coco xt-rtc adapter by Burke and Burke 
> (FromTandyCoCoForums)
>
>
>> Hi,
>>
>> The jumper in question appears to hovering over a 74ls32 pin 14 (VCC). 
>> You have to have a clearer head than mine to put the pictures of back and 
>> front together, so I may have messed up.
>>
>> If it was over pin 1 then I would say connect it as it is surely part of 
>> the address decode.
>>
>> But pin 14 (VCC) has stumped me.
>>
>> The other jumper may be connected to ground, but I am not sure. That 
>> might make VCC a better candidate.
>>
>> In any case, my eyes may be seeing a date of 1989 so the battery in the 
>> smart watch must be dead.
>>
>> We can I expect to be able to get more pictures, but telling where the 
>> other ends of the jumpers go, they would not be helpful.
>>
>> Knowing where in the address space the RTC appears might be helpful.
>>
>> SHF
>>
>>
>> ----- Original Message ----- 
>> From: "Bob Devries" <devries.bob at gmail.com>
>> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
>> Sent: Sunday, April 07, 2013 9:30 PM
>> Subject: Re: [Coco] coco xt-rtc adapter by Burke and Burke (From 
>> TandyCoCoForums)
>>
>>
>>> Hi Stephen,
>>>
>>> it would be useful to know which chip those wires connect to, and which 
>>> pins (1 & 2?).
>>>
>>> Regards, Bob Devries
>>> Dalby, QLD, Australia
>>>
>>> ----- Original Message ----- 
>>> From: "Stephen H. Fischer" <SFischer1 at Mindspring.com>
>>> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
>>> Sent: Monday, April 08, 2013 2:02 PM
>>> Subject: [Coco] coco xt-rtc adapter by Burke and Burke (From Tandy 
>>> CoCoForums)
>>>
>>>
>>>>
>>>> http://tandycoco.com/forum/viewtopic.php?p=865#p865
>>>>
>>>> Coco xt-rtc problems
>>>>
>>>> I have a coco xt-rtc adapter by Burke and Burke. This one is supposedly 
>>>> a pre-production model. Comes without a case. Bought it from a local 
>>>> recycler, who obtained it from a collector who claimed everything 
>>>> worked last time used.. Anyway, I can't get it to work, and from basic 
>>>> inspection, I can see what might be a loose jumper. I'm going to post a 
>>>> link to a my Flickr account, a close up of the board, maybe somebody 
>>>> can tell me if this needs to be soldered to one of the near by points.
>>>>
>>>>
>>>> http://www.flickr.com/photos/94829497@N08/8628815773/
>>>>
>>>> I am not sure if it was like this when I got it, or I damaged it on the 
>>>> way home.. Thanks!
>>>>
>>>> -Shane
>>>>
>>>> --------------------------------
>>>> Re: Coco xt-rtc problems
>>>>
>>>> http://www.flickr.com/photos/94829497@N08/8628815983/in/photostream/
>>>>
>>>> Does this help? The top right ic, top 2 pins on the left side..
>>>>
>>>> ------------------------------
>>>>
>>>> Hi,
>>>>
>>>> I do not have this device and cannot tell where this jumper should go 
>>>> from the pictures.
>>>>
>>>> Can anyone else help?
>>>>
>>>> SHF
>>
>>
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>
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