Need help again, hehe, this time in asm

[Piru]

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        SECTION DATA_C,DATA_C
copper: dc.w ...
        dc.w $ffff,$fffe
        dc.w $ffff,$fffe

Or alternatively AllocMem MEMF_CHIP memory and build the copperlist into this memory.

[Piru]

Some comments...

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    move.l dosbase,a0
    move.l -30(a0),oldcop ;I think it was -30


That's wrong. DOSBase - 30 is ptr to jump to _LVOOpen routine, not old copper list. You only find JMP (abs).l instruction there on 2.x+ or 'moveq #x,d0 + bra.w' with 1.x.

This means the code is unable to restore system copper list at exit.

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loadsys:

move olddma,$dff096


You need to disable all DMA before restoring:

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loadsys:

move.w #$7fff,$dff096
move.w olddma,$dff096

Also, the code lacks disabling of interrupts (INTENA(R)) before peeking & poking DMACON(R).

In fact, you probably want to take a look at proper minimal startup code hwstartup.asm.