Forth on Mars 
Author Message
 Forth on Mars

The software that went to Mars was Wind River Systems' VxWorks RTOS.  I just stumbled
across their web site (wrs.com).  A radiation hardened PowerPC runs the lander module,
while an 80C85 controls the rover.

The project's 150,000 lines of code took seven programmers over three years to develop,
using what is probably the best C/C++ based development environment available.

-- Brad Eckert



Fri, 21 Jan 2000 03:00:00 GMT  
 Forth on Mars


Quote:

> The software that went to Mars was Wind River Systems' VxWorks RTOS.  I
just stumbled
> across their web site (wrs.com).  A radiation hardened PowerPC runs the

lander module . . . .

The lander computer is a RAD-6000 microprocessor.  It is based on the IBM
RSC chip that was first built before the IBM-Apple-Motorola team was even
announced.  The RSC chip was the basis of the consortium's first PowerPC,
the 601 chip used in the first generation Macs.  

I believe the Rad-6000 clock rate in Pathfinder is about 20 MHz; about 1/3
the speed of the oldest, slowest, Power PC based Mac.  The Rad-6000 chip
is built at a rad-hard foundry in Manassas, Va.  At the time the design
started, that facility was part of IBM and hence the natural selection of
the IBM RSC design for hardening.  Subsequently, the plant was bought by
L{*filter*}and now its owned by Lockheed-Martin.  Sure wish they'd gotten
enough support to keep their rad-hard processors moving along the as far
as the PowerPC has evolved.

Marty Fraeman
JHU/APL
Johns Hopkins Road
Laurel, Md 20723
voice:  (301) 953-6000, x8360
fax:  (301) 953-6556



Sat, 22 Jan 2000 03:00:00 GMT  
 Forth on Mars

Quote:


> >... while an 80C85 controls the rover.

> You mean the Intel half-brother of the Z80? Sheesh, they DO use "modern"
> technology these days. And us ordinary people being frustrated about our
> PC running on an old 486.

They used it mainly because it had to be rad hard.  BTW, the whole story can be found at
http://www.wrs.com.  There's a lot of radiation beyond the Van Allen belt.  Kind of
makes you wonder why the Apollo astronauts are living to a ripe old age.

-- Brad Eckert



Sun, 23 Jan 2000 03:00:00 GMT  
 
 [ 3 post ] 

 Relevant Pages 

1. Forth on Mars?

2. APL-L Digest - 22 Mar 2001 to 23 Mar 2001 (#2001-63)

3. INFO-ADA Digest - 18 Mar 1997 to 19 Mar 1997 - Special issue

4. comp.lang.forth FAQ: vendors (4 Mar 1996), part 3/6

5. comp.lang.forth FAQ: vendors (4 Mar 1996), part 3/6

6. comp.lang.forth FAQ: books (30 Mar 1996), part 5/6

7. Forth On-line Resource/Technical Help (v1.6, 15-Mar-92)

8. Forth On-line Resource/Technical Help (v1.6, 15-Mar-92)

9. Forth On-line Resource/Technical Help (v1.6, 15-Mar-92)

10. Forth On-line Resource/Technical Help (v1.6, 15-Mar-92)

11. Forth On-line Resource/Technical Help (v1.6, 15-Mar-92)

12. Forth On-line Resource/Technical Help (v1.6, 15-Mar-92)

 

 
Powered by phpBB® Forum Software