Subject: Re: NVRAM replacement on sun4c machines
To: Don Koch <aardvark@krl.com>
From: Rob Healey <rhealey@norstar.com>
List: port-sparc
Date: 06/13/2005 10:39:33
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On Jun 12, 2005, at 4:30 PM, Don Koch wrote:

> Andy Wallis said:
>
>> This should help remove the problem that the changes made to the  
>> SGS-Thompson
>> (formerly Mostek) M48T02 chips had on the sun4c machines.
>>
>
>
> rmk@toad.rmkhome.com said:
>
>> Do you know of a vendor that will actually ship a few of these? My  
>> online
>> searches mostly come up with vendors who sell 100+ minimum.
>>
>
> Mouser Electronics has the ST Micorsystems MT48T02 in three speeds:
> 70, 150 and 200 ns access time.  I'm not sure which speed can be used
> for the sun4c.  $16 each.  http://www.mouser.com/
>

The Mouser part won't work properly, you need the Dallas Semi version  
of the chip; the Mouser part reports back the wrong value during the  
boot and causes the PROM to bail. Specifically, it doesn't have the  
high bit hard coded to zero so the dumb PROM test fails...

Anyone know of a place that will sell the Dallas Semi part in onesy/ 
twosy quantity?

-Rob
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