[rescue] Sun E4K CPU Upgrade

[Mike Spooner]

Hi all,

Just noting that there are no 440 MHz CPU options for the Ex000 range, but
there is a 464 MHz CPU module for them.
As far as mixing goes, the CPUs will match-down to the lowest
backplane-clock-frequency that any of them supports.
I guess the key question is whether the clock-board provides a separate
multiplier ratio setting to each CPU/memory board separately,
or whether there is just a single system-wide ratio it provides. Anybody
know?

Regards,
Mike

On 27 June 2018 at 08:32, Peter Stokes <peter at ashlyn.co.uk> wrote:

> 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
> _______________________________________________
> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue