30 Sep
2002
30 Sep
'02
3:09 p.m.
----- Original Message -----
From: "Jim Kearney" <jim(a)jkearney.com>
It goes beyond that... there is a Silicon-On-Saphire version which is
considerably more rad-hard than a pure silicon process. In fact even more
recent space probes like Galileo (launched 1989) used 1802s.
According to http://www.amsat.org/amsat/sats/phase3d/ihu.html , AO-40 (which
was launched on Nov 16th, 2000) uses an 1802 as its internal housekeeping
unit. Here is a brief quote from the page: "The P3D IHU is based on a
Sandia-processed (rad hard) CDP1802 COSMAC processor and standard
4000-series CMOS logic operating at a nominal power supply of 10-volts. The
memory array is based on donated GEC Plessey MA9287 rad-hard CMOS static
RAMs, giving a total memory size of 64k bytes. "