On 01/22/2017 01:49 PM, Maciej W. Rozycki wrote: > A problem with reworking is there is sometimes very little clearance > available, so any modification has to be made in a clever way or you > risk a short-circuit. For example in DECstation 5000 systems their > DS1287 chip is located in the TURBOchannel option slot area with the > top of the chip almost reaching the solder side of the PCB of any > option plugged in there.
Although there are several illustrations of the DS1287 rework where a coin-cell holder was placed atop the chip, there's absolutely no reason why that has to be so. A couple of wire leads away to an off-board battery holder, holding, say, an ER14250 half-AA.will work just fine and keep the battery away from the PCB--or a couple of alkaline AA cells, which should last a few years. No reason to stick to lithium. You know--"use your wetware". --Chuck
