[comp.sys.amiga] 680x0 vs 68000

jms@tardis.Tymnet.COM (Joe Smith) (08/23/90)

[Note that I have removed alt.sources.amiga from this crossposting.]

In article <15802@s.ms.uky.edu> phoenix@ms.uky.edu (R'ykandar Korra'ti) writes:
>  As for incompatiblity; yes, only as far as the 68020 is also incompatible.
>  Programmes that will run on a 68020 will run on a 68010.
>                                                      - R'ykandar.

This is incorrect.  Programs that were compiled to run on a 68020 will NOT
run on a 68010 or 68000 because the 68020 uses some opcodes that are
illegal on the earlier processors, and the 68020 has new addressing modes
that the 010 and 000 don't even notice.

Programs that were developed on a 68020 will run on a 68000 as long as the
programmer tells the compiler to use 68000 compatible binaries.
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