[Simh] Other simulations

[Bill Gallagher]

The 2500 series used the 68EC030 and a bunch of fairly standard chips.

Certainly the ethernet, ISDN and serial ports are. There is even a port of uClinux for it. (www.uclinux.org/ports) Browsing the sources for it reveals that it is fairly straight-forward 68K device.

The uClinux port does not make any use of the PROMS as they are not documented. - I did however figure one or two of the rom support traps - IE read the ram size, IO memory locations and a few other things like read the eeprom and see the config file.

I had thought of emulating the 68EC030 processor so as to be able to 'execute' the roms so as to see what they were doing. But I didn't bother. :-(

Bill



-----Original Message-----
From: simh-bounces at trailing-edge.com
[mailto:simh-bounces at trailing-edge.com]On Behalf Of Alexander Schreiber
Sent: 10 February 2005 20:06
To: simh at trailing-edge.com
Subject: Re: [Simh] Other simulations


On Thu, Feb 10, 2005 at 08:27:29AM -0600, Carey Tyler Schug wrote:
> Has anybody ever considered trying to simulate things that are not 
> central processing units?
> 
> I'm thinking of things like Cisco routers.  That would be a little off 
> the original purpose of SIMH.  Yes, a Cisco 2500  series router is a 
> "historically significant computing device", but the impetuous for it 
> would be all of us trying to learn Cisco routing to get certified.  I 
> think the 2500 uses a 68000 cpu chip.  I suspect the interfaces are not 
> published, so that might make it impossible, but I don't know.

Yes, some Cisco routers used Motorola 68k chips. But AFAIR, the 68k chip
only was there as a supervisor and control CPU, while the heavy lifting
(flinging packets all over the place) was done by special purpose chips
which were just told by the 68k what they had do to.
So emulating it is not exactly easy - and then there is the question
with obtaining legal copies of the operating system to run on the
simulated router.

Regards,
      Alex.
-- 
"Opportunity is missed by most people because it is dressed in overalls and
 looks like work."                                      -- Thomas A. Edison
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