On Mon, 28 May 2018 15:19:02 +0000, Jethro_uk wrote:

On Mon, 28 May 2018 14:25:48 +0000, Bob Eager wrote:

On Mon, 28 May 2018 14:04:05 +0000, Jethro_uk wrote:

On Mon, 28 May 2018 14:06:11 +0100, T i m wrote:

In something 20 years old it could well be a 3.6V Nicad /
rechargeable that would be soldered onto the Mobo.

Some designs had the battery integral to the RTC chip.

Dallas DS12887 as I recall.

That's the badger !

When we needed one (1991, so pre internet) there was no retail outlet in
the UK. My brother had to go to Birmingham to the sales office where
they gave him one (they hadn't the admin to sell one. Ten thousand, yes.
One, no ).

As I said, replacement was hairy - you needed the PC up & running to be
able to send the pulse to start the new chip clock.

I used them on the PS/2 Model 55 - it was obviously better designed! Plug
it in and it worked.



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