[Coco] 6309 vs 6809

[Harry Hurst]

> in fact i think i found one difference: the 6309 seems to trap invalid
> instructions even in emulation mode.
>
> just try to boot the hdbdos (with the cart pin connected to the e-clk) it
> makes to run the code from $c000 where there is a DK string there. the
> cart accidentally goes to cold boot on 6809 cpus but hangs on 6309 ones.

The vector at $FFF0-$FFF1 traps Illegal Opcodes and Division by Zero on
the  6309.

HH