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Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment. |
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13th May 2017, 7:41 am | #1 |
Retired Dormant Member
Join Date: May 2017
Location: Kowloon, Hong Kong
Posts: 2
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Want to fix a vintage computer without a DS1287 Real Time Clock
I want to reanimate an a old vintage computer, the IBM PS/2 55SX.
The dead component is the DS1287 Real Time Clock (in particular, the battery inside). Is it possible to simulate with a BASIC Stamp micro-controller the behavior of a DS1287 so that I can boot my old IBM PS/2 55SX? The DS1287 pin are damaged (I mean current can not flow between the broken DS1287 and its socket) so I can't modify it, to use another battery. Attachment 142514 |
13th May 2017, 10:19 am | #2 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,289
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Re: Want to fix a vintage computer without a DS1287 Real Time Clock
Hello and welcome to the forums.
Did you intend to post a link to an edge connector? Your attachment is invalid.
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
13th May 2017, 12:11 pm | #3 |
Octode
Join Date: Jan 2014
Location: Oban, Scotland, UK.
Posts: 1,129
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Re: Want to fix a vintage computer without a DS1287 Real Time Clock
The device is pin-compatible to the MC146818A which itself is available via Digipart - if you can't get the DIP version you could get the PLCC version and solder it to a suitable converter PCB.
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13th May 2017, 2:20 pm | #4 |
Nonode
Join Date: Oct 2008
Location: Warsaw, Poland and Cambridge, UK
Posts: 2,679
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Re: Want to fix a vintage computer without a DS1287 Real Time Clock
I'm afraid a BASIC Stamp wouldn't be fast enough to work as a substitute for a DS1287. While keeping the time is no problem, the DS1287 and its equivalents have a parallel bus interface which operates too quickly to emulate in software. You could do it with a CPLD, but there's no point when so many equivalents, like the (once) industry standard MC146818 are available. Adding your own battery backup shouldn't be too painful.
Chris
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13th May 2017, 11:02 pm | #5 | |
Tetrode
Join Date: Feb 2007
Location: Liverpool, Merseyside, UK.
Posts: 99
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Re: Want to fix a vintage computer without a DS1287 Real Time Clock
Quote:
http://www.mcamafia.de/mcapage0/dsrework.htm Alternatively, there are some cheap DS1287 RTC modules (presumably clones) listed on eBay - from as little as US $1.86 each, including shipping: http://www.ebay.com/sch/i.html?_from...fLoc=2&_sop=15 |
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