On Fri, 22 Jan 2021 17:17:02 +0100, =?UTF-8?Q?Bj=c3=b6rn_Lundin?=
 wrote:

>I was at a fascinating talk in Madrid in 2015 by a guy at ESA
>and he said (I can't remember which - or both) that either Rosetta or
>Philae was coded i Forth, with design/coding started in 1994 and
>launched 10 years later.

Philae used 10 RTX2010 CPUs, an ADSP21020 and two 80C3X devices.

Forth on an RTX2010 was far and away the best choice for performance
and ease of test - the CPU was designed for Forth. An RTX2010 is
a rad-hard 16 bit dual stack machine made by Harris/Intersil. It
clocked at 8 MHz (probably rather less for flight use) and could
address 1 Mb of memory.

These days rad-hard development focuses on processors in FPGAs.

Stephen

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Stephen Pelc, stephen@vfxforth.com <<< NEW
MicroProcessor Engineering Ltd - More Real, Less Time
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