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Old 13 January 2020, 13:35   #4
sparhawk
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Join Date: Sep 2019
Location: Essen/Germany
Age: 51
Posts: 321
The problem is this line!
Code:
ADD.W	#15,A3
On 68000 (10/20 as well?) the data needs to be on an even address for word or longword access, so this will cause a guru. On higher CPUs this will work, but causes a speed penality.

Another thing that I find strange is that you do
Code:
LEA	BITPLANE,A3
This means that your "bitplane" is defined in your source, right? But the bitplane must be located in chipmem, so if this is just a buffer, this is fine. If this is really a bitplane to be displayed, you must make sure that it is in chipmem.

Last edited by sparhawk; 13 January 2020 at 13:42.
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