replacing 71b batteries without losing data

[Garth Wilson]

I've never had any memory loss from changing the 71's batteries.  Same with the 41.  I've heard of 41's going as much as 12 or 24 hours without batteries installed and all the memory was kept, but I still always do it as fast as I can without making mistakes.  I had a situation in about 1986 or '7 where a 10uF capacitor kept an 8Kx8 SRAM alive overnight, from closing time at work one day 'til I got back to work the next day.  I did not experiment to find out how much longer it would go.