Installing a 32k DS1386 into an SGI Indy that expects an 8k DS1386

 The TL;DR is - you can't just plug a 32k DS1386 into an SGI Indy and have it work, as a bunch of stuff is wrong.

 The longer version!

Here's a picture from the datasheet:

Now, at the outset it looks like A13 and A14 on the 32k module need to at least be grounded - if they're floated or high then the RAM will be selected when you don't want it to be, and you'll just fail to see the RTC.

 However, if you just do that your Indy won't boot because it turns out that pin 3 on the 8k module is an undocumented (in this datasheet) auxiliary Vcc input - the 5v auxiliary / always-on rail is actually there. Shorting it to ground will just make the Indy super sad. Don't do that.

So, in lieu of making up a PCB (which I think I'm going to do anyway just to be "clean" - I used some pin headers to raise the DS1386 above the Indy PCB.

 Note that pin 3 on and pin 28 don't have pins (and I'm going to put some tape over the pins just to be super clear nothing shorts out).

Then, I did a quick bodge wire job on the underside of the DS1386-32K module:

 Where pin 3 and pin 28 are tied to pin 16.

 Then, well, plug it in, align it right, and it should just work! It did for me!