[rescue] OBP version questions

[Lionel Peterson]

Dumb question - are the PROM versions digit specific or value specific?

Is 2.7 older than 2.25R or is 2.25R older than 2.7?

Put another way, which is the most recent of the two?

Thanks,

Ken

> On May 5, 2023, at 12:54, vom513 via rescue <rescue at sunhelp.org> wrote:
> 
> Hello all,
> 
> Was going to try to buy a newer PROM for one of my boxes (ss10).  I see two on eBay that I’m looking at - one is 2.7 and the other 2.25R
> 
> - Am I correct in thinking the “R” PROM(s) are for supporting Ross CPUs ?  And that you MUST have an “R” PROM to use a Ross CPU ?
> 
> - Assuming this is correct - do the “R” proms also support Sun branded CPUs (Supersparc, TMS, SMXY, etc) ?
> 
> - The 2.7 I assume was from Sun - and doesn’t support Ross ?
> 
> - Was there any coordination / correlation between Ross vs. Sun PROM versions ?  I.e. is 2.7 indeed newer than 2.25 - or are the versions apples vs. oranges ?
> 
> Thanks.
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