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

[Bob Devries]

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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