SE/30 Clocks

[robin-fo]

The SE/30 has a 31.3344MHz Oscillator and a 16.9344 Quartz on its Logic Board. Is it possible to swap these to 32.000MHz and 16 MHz parts or will the system become unstable?

 

[djc6]

Not the same computer, but I came across this thread yesterday about someone substituting 31.3344Mhz crystal with 32Mhz on a Mac LC:

LC Crystal Oscillator - UK/Europe

Hello! I recently picked up an LC, and unfortunately, there is serious corrosion on the board becasue of a leaking battery. I have cleaned this up as best I can, but some components are in need of replacement. Aside from the caps, I specifically need to replace the 31.3344 Mhz crystal. This...

68kmla.org

BTW, there are plenty of new old stock 31.3344Mhz crystals on ebay. This listing is unfortunately for qty 25, but I happened to notice it even has an Apple part number on the box: https://www.ebay.com/itm/254877901917

 

[robin-fo]

I guess I simply have to try it.. The thing is, I really like the look of the FOX oscillators, but I can‘t find 31.3344 ones from them on eBay…

32MHz 4 Pin Crystal Oscillator Clock F1100E Fox 20.3x12.7mm | eBay

32MHz 4 Pin Crystal Oscillator Clock F1100E Fox 20.3x12.7mm | Business & Industrial, Electrical Equipment & Supplies, Electronic Components & Semiconductors | eBay!

www.ebay.ch

 

[croissantking]

I guess I simply have to try it.. The thing is, I really like the look of the FOX oscillators, but I can‘t find 31.3344 ones from them on eBay…

How funny - I don’t like the look of the Fox ones (but the little fox icon is cute). My favourite is the Saronix with black print.

 

[djc6]

I'm not Superman, so I can't see inside my SE/30 with my X-Ray vision

Then again, I picked yellow polymer tantalum caps because I thought they blended in with the other yellow ICs on the board. So I get wanting to find just the right components.

 

[zigzagjoe]

Afaik, 32mhz is fine per @Bolle. No idea on the quartz.

 

[codevonlux]

16.9344 quartz is for the audio, if you change it then the sample rate like 11.025KHz/22.05KHz will change and will sound off.

 

[Arbee]

If you move the 31.3344 MHz crystal to 32 MHz everything should still work, except I'd be very wary of floppy I/O under those circumstances. It will probably work (particularly if you use only disks that were formatted with the faster crystal), but writing in particular could potentially fall off the timing window and wreck the disk.