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Purpose of purposefully omitted component on IIsi board?

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Anyone know what this (oscillator?) does-- located at 1B-1C marked Y2 rated/printed 32.768KHz on the IIsi motherboard? in the top (of this image) at the corner of the ROM SIMM and RAM bank?

I'm assuming it's not integral, but I'm curious.


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19 hours ago, cruff said:


Looks like it could be an alternate form factor if Y1 isn't available, Y2 would be populated?





That crystal is used as a timing source for the RTC.


SE/30 boards have those two alternate pads for the sound chip crystal. I have one that had a bad oscillator and replaced it with a SMD part on the normally unused pads instead of the through hole component that’s on there from the factory.

Edited by Bolle

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