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 DALLAS clock/battery View next topic
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bear



Joined: 04 Oct 2004
Posts: 194
Location: 57�59'N 15�39'E

PostPosted: Sun Dec 06, 2020 8:51 am Reply with quoteBack to top

I am going to atempt this on a 286 with DrDos ROM, a Facit measuring coputer.

https://www.youtube.com/watch?v=xBvw1TLHyqM
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bear



Joined: 04 Oct 2004
Posts: 194
Location: 57�59'N 15�39'E

PostPosted: Mon Dec 07, 2020 10:21 am Reply with quoteBack to top

Success Smile Got a C: prompt, On the Facit Industrial PC N1200. Some info here under new products: https://books.google.se/books?id=PUMJFIR4RGcC&pg=RA1-PA38&lpg=RA1-PA38&dq=facit+industrial+pc+n1200&source=bl&ots=yXBbrKrATB&sig=ACfU3U2AJJ86YZ68N9jzX-fObQDeWRnxsw&hl=sv&sa=X&ved=2ahUKEwi_z7PzjrrtAhUE_KQKHUo7ARUQ6AEwAHoECAEQAg#v=onepage&q=facit%20industrial%20pc%20n1200&f=false
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bear



Joined: 04 Oct 2004
Posts: 194
Location: 57�59'N 15�39'E

PostPosted: Mon Dec 07, 2020 10:31 am Reply with quoteBack to top

Some pics:https://photos.app.goo.gl/jx5xcwaDdZKDAULZ9

I did the drilling and the soldering without taking the MB out or taking it of Smile because I am lazy and here was space to do it.
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T-R-A



Joined: 02 Oct 2004
Posts: 589
Location: Western NC

PostPosted: Tue Dec 08, 2020 9:54 am Reply with quoteBack to top

Yep, reworking a DS1287 isn't too difficult....the basic idea has been around for years:

http://www.mcamafia.de/mcapage0/dsrework.htm

In some systems, a DS12887 will work, but those are also getting difficult to find.
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bear



Joined: 04 Oct 2004
Posts: 194
Location: 57�59'N 15�39'E

PostPosted: Tue Dec 08, 2020 10:24 am Reply with quoteBack to top

Nice, one can attach ground to pin 12 though and only drill for pin 20.
What would happen if I removed the ROM s with DRDos (U43 and U49) would it work as normal with floppy and hdd ?
Anyway the ST-125A with a 40 pin connector RLL ?) that I have only start sometimes and were to find another one I do not know Sad This old one comes from a Nokia machine 21meg. The one which came with the top model of N1200 were 40 meg.
MFMs I have few but that does not help.
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Skyfrog



Joined: 01 Oct 2006
Posts: 36
Location: USA

PostPosted: Sun Dec 20, 2020 1:07 pm Reply with quoteBack to top

I have a Pentium MMX system with one of those dead Dallas chips, I've been thinking about getting one of those modern replacements that use CR2032 cells but they are a bit expensive just for a battery. Maybe I'll give this a try instead.

Edit: I ended up just buying a modern chip from Glitchworks that uses the coin cells. Installed a socket and dropped it in, works perfectly.
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bear



Joined: 04 Oct 2004
Posts: 194
Location: 57�59'N 15�39'E

PostPosted: Mon Oct 25, 2021 12:07 pm Reply with quoteBack to top

Skyfrog wrote:
I have a Pentium MMX system with one of those dead Dallas chips, I've been thinking about getting one of those modern replacements that use CR2032 cells but they are a bit expensive just for a battery. Maybe I'll give this a try instead.

Edit: I ended up just buying a modern chip from Glitchworks that uses the coin cells. Installed a socket and dropped it in, works perfectly.


Yes, that will work, but on this old one I think it is more functions inthe Dallas chip than just battery ?
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