|Re: [hatari-devel] Re: 040/060 emulation issue with Q2|
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Le 04/03/2015 15:48, Douglas Little a écrit :
OK, so back to the opcode ff70, and looking at 68030 user manual
chapter 10.1.3 with the format of line F instructions, it is stated
that CpID 001 (bit 9 to 11) is used for 68881 and 6882, and 111 is
So, this really looks like an illegal instruction that should not be
used in the 1st place. Is this handmade asm, or the result of a C
This case was the result of the C compiler. However, I also noted that
the PC addresses were incrementing by strange values in the debugger
trace - too big for normal instructions ($00028092 -> $000280ce). So it
may well have just run off into dead space by that point. The whole
thing looks quite strange TBH.
I'll try to get something a bit more concrete later on after work.
Maybe try to get a memory dump to see if it matches the disasm dump and
to see what bytes were between 28092 and 280ce for example.