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Re: modeling a simple cpu

Gavin Kistner

10/26/2006 8:28:00 PM

From: Ara.T.Howard [mailto:ara.t.howard@noaa.gov]
> i need to model the on board cpu of a satellite in order to
> mock running uploaded commands. basically i need to model
> the internal state and all incoming commands so i can
> determine register states at a given point in time.

Not to distract the thread from your very real question, but you do
realize that you have one of the coolest jobs around, right? :)
6 Answers

James Gray

10/26/2006 8:35:00 PM

0

On Oct 26, 2006, at 3:28 PM, Gavin Kistner wrote:

> From: Ara.T.Howard [mailto:ara.t.howard@noaa.gov]
>> i need to model the on board cpu of a satellite in order to
>> mock running uploaded commands. basically i need to model
>> the internal state and all incoming commands so i can
>> determine register states at a given point in time.
>
> Not to distract the thread from your very real question, but you do
> realize that you have one of the coolest jobs around, right? :)

I agree. ;)

James Edward Gray II

Paul Lutus

10/26/2006 8:45:00 PM

0

Gavin Kistner wrote:

> From: Ara.T.Howard [mailto:ara.t.howard@noaa.gov]
>> i need to model the on board cpu of a satellite in order to
>> mock running uploaded commands. basically i need to model
>> the internal state and all incoming commands so i can
>> determine register states at a given point in time.
>
> Not to distract the thread from your very real question, but you do
> realize that you have one of the coolest jobs around, right? :)

The last processor I successfully modeled was the old 6502 (Apple II), since
then processor behavior has become too difficult to sort out in any
reliable way (IMHO).

It would be interesting for the OP to reveal what kind of processor is
involved, and how complex. I am going to assume it doesn't support
interrupts or threads, otherwise there is little chance to mimic its
behavior.

--
Paul Lutus
http://www.ara...

Ara.T.Howard

10/26/2006 10:26:00 PM

0

Ara.T.Howard

10/26/2006 10:34:00 PM

0

M. Edward (Ed) Borasky

10/26/2006 11:01:00 PM

0

ara.t.howard@noaa.gov wrote:
> On Fri, 27 Oct 2006, Paul Lutus wrote:
>
>> Gavin Kistner wrote:
>>
>>> From: Ara.T.Howard [mailto:ara.t.howard@noaa.gov]
>>>> i need to model the on board cpu of a satellite in order to
>>>> mock running uploaded commands. basically i need to model
>>>> the internal state and all incoming commands so i can
>>>> determine register states at a given point in time.
>>>
>>> Not to distract the thread from your very real question, but you do
>>> realize that you have one of the coolest jobs around, right? :)
>>
>> The last processor I successfully modeled was the old 6502 (Apple II),
>> since
>> then processor behavior has become too difficult to sort out in any
>> reliable way (IMHO).
>>
>> It would be interesting for the OP to reveal what kind of processor is
>> involved, and how complex. I am going to assume it doesn't support
>> interrupts or threads, otherwise there is little chance to mimic its
>> behavior.
>
>
> it's for these guys
>
> http://heasarc.nasa.gov/docs/heasarc/missions...
> http://www.ngdc.noaa...
>
> at this point i only need to model a limited subset of the processor (i
> don't
> know the type yet). basically i'll be executing something long these lines
>
>
> !=================================================================
> !***** GAIN ORBIT MEMORY FOR OPS45 26 JAN 04 - 01 FEB 04 *****
> !=================================================================
> !
> 0.000 CMD OAXSPG 0x00 ; 807E# (PAGE=0)
> 0.000 CMD OGNASG LIN ; 0010# ASGC LIN
> !
> 0.076 CMD OAXLOD 0xA2 ; 511E# (112dB) (SED)
> 0.076 CMD OAXSTR 0x44 ; A22E# (BC MAX)
> !
> 0.316 CMD OAXLOD 0x03 ; 819E# (.08) (VED-1/00)
> 0.316 CMD OAXSTR 0x48 ; A42E# (BRDF X2)
> !
> 0.324 CMD OAXLOD 0x06 ; 831E# (.25) (VED-00/12)
> 0.324 CMD OAXSTR 0x46 ; 232E# (BRDF HRD)
> 0.324 CMD OAXLOD 0x9E ; 4F1E# (136dB)
> 0.324 CMD OAXSTR 0x44 ; A22E# (BC MAX)
> !
> 0.326 CMD OAXLOD 0x8E ; C71E# (118dB) (VES)
> 0.326 CMD OAXSTR 0x44 ; A22E# (BC MAX)
> !
> 0.650 CMD OAXLOD 0x29 ; 149E# (.02)
> 0.650 CMD OAXSTR 0x48 ; A42E# (BRDF X2)
>
> ....
> ....
> ....
>
> as you can tell these are load/store/add instuctions. there are no
> parameters, all the values are burned on board before flight - so there are
> only certain values you can do ops with. as you can tell it's ultra
> simple -
> basically i'll just have to model rom, ram, registes, and ops.
>
>
> hey - a smell a ruby quiz! ;-)
>
>
> -a

Isn't there an open-source "universal old architecture emulator" package
of some kind? I remember seeing it in Debian when I was running Debian
-- it could play most of the old Atari games, etc.

I can certainly see if it's in Gentoo, if I can figure out what it was
called.

M. Edward (Ed) Borasky

10/26/2006 11:25:00 PM

0

M. Edward (Ed) Borasky wrote:
> Isn't there an open-source "universal old architecture emulator" package
> of some kind? I remember seeing it in Debian when I was running Debian
> -- it could play most of the old Atari games, etc.
>
> I can certainly see if it's in Gentoo, if I can figure out what it was
> called.
>
>

I think I found it ... simh

http://simh.trailing...

Of course, I'm probably the only one on this list that's actually
*touched* some of those gizmos :)

Sheesh -- a computer museum on your hard drive :)