[rescue] Sun E4K CPU Upgrade

[Peter Stokes]

Hi

Jonathan says it all really, the only other issue was you needed the later
clock boards to get 400 and 440Mhz the part nos are well documented in the
handbook.

The other little 'trick' I found was the E3XXX and the E4XXX I/O power supply
are the same, the only difference was the switch, so with a bit of soldering
you can swap them. This was particularly useful as E3XXX ones tended to be
harder to find. The power cooling modules PSUs were all the same.

Peter




On 27 Jun 2018, at 08:08, Jonathan Katz <jon at jonworld.com> wrote:

> You can mix/match CPUs and it will always clock at the lower CPU frequency
> to maintain compatibility, IIRC.
>
> There were so many 400Mhz P/Ns because of ecache parity issues and
> manufacturing issues. Some came from TI, some came from Sony, etc. Some had
> different cache sizes, IIRC, and some had mirrored cache(!) (later editions
> of the 400 and 440Mhz.)
>
> The difference between xx00 and x500 was the backplane speed, and then the
> CPU and IO boards had different revs to match the backplane. If you have an
> older IO or CPU board, it will dumb-down to the slowest clock speed so the
> system can run.
>
> On Wed, Jun 27, 2018 at 7:51 AM, Richard <ejb at trick-1.net> wrote:
>
>> Thanks Peter
>>
>> So based on the following I think it is safe to say its a 4000. And if I
>> understand what you are saying if I put 400Mhz CPU in then all I am going
>> to get is 336Mhz any way so probably no point in up reving the existing
>> CPU. Probably not supported (probably not an issue for a hobby machine)
>> but can you mix 336Mhz and 400Mhz CPU in the same chasis
>>
>> 8-slot Sun Enterprise 4000/5000, No Keyboard
>> OpenBoot 3.2.29, 9216 MB memory installed, Serial
>>
>> 0,0>    CPU Module Status
>> 0,0>-----------------------------------------------------------------
>> 0,0> MID  OK  Cache  Speed   Version
>> 0,0>-----------------------------------------------------------------
>> 0,0>  0 | y | 4096  |  336  | 00170011.20000507
>> 0,0>  1 | y | 4096  |  336  | 00170011.20000507
>> 0,0>  4 | y | 4096  |  336  | 00170011.20000507
>> 0,0>  5 | y | 4096  |  336  | 00170011.20000507
>> 0,0>  8 | y | 4096  |  336  | 00170011.20000507
>> 0,0>  9 | y | 4096  |  336  | 00170011.20000507
>> 0,0>-----------------------------------------------------------------
>> 0,0>System Frequency (MHz),fcpu=336, fmod=168, fsys=84, fgen=336
>>
>> and also that it is running at 336Mhz according to the System Frequecny
>> and an 83Mhz Gigaplane (is that the fsys number rounded up?)
>>
>> Regards
> _______________________________________________
> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue