After upgrding to 6.9 version I obtain
Unhandled SIGILL: An illegal instruction occurred in Sage. This probably occurred because a compiled component of Sage has a bug in it and is not properly wrapped with sig_on(), sig_off().
Sage will now terminate.
as response to use of float 1.2 but 12/10. works fine.
iMac (2008) Intel Core 2 Duo.