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Forums > C64 Coding > Exmoizser and Mem trash RAM?
2016-11-30 11:47
oziphantom

Registered: Oct 2014
Posts: 490
Exmoizser and Mem trash RAM?

I'm using the mem option, and the depack routine provided in the src of exomizer.

The data is from BB28-DF40 I set the load address to 1000 like so
exomizer mem -l $1000 -o drop64BitmapMem.prg  dropzonebitmap.prg

However it seems the Exomizer then wants to clear all RAM between 1000-BB28 when it depacks, which trashes the depacker. How do I stop it?
 
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2016-11-30 19:43
chatGPZ

Registered: Dec 2001
Posts: 11386
mein luftkissenboot ist voller Aale
2016-12-01 04:57
oziphantom

Registered: Oct 2014
Posts: 490
Solved the loader issue, seems a
lda dd00
and #252
sta dd00
doesn't count as a non-arbitrary dd00 write in the Krill loader's eyes and I needed to add the idle bus lock feature.

So Exomizer
Running iAN's test prg worked ( I'm using ICU=64 Vice 2.3 so I can see what the depacker is doing more easily, but 2.3 anything can and will happen, so it was a needed test of my setup )

Putting iAN's know working exo file into my d64 and it still trashes RAM... Thus my code is to be at fault... ( I "ported" the decrunch to Tass64 ), nope it is fine....

Something was trashing a byte in the "decrunch_table" which is what caused it to at the end of the decrunch to just march through RAM...

Thanks for the test cast iAN, made it a lot easier to track down.

Oddly Groepaz it's the inverse case, in that you're the euros and I'm not XD
2016-12-01 09:08
JackAsser

Registered: Jun 2002
Posts: 2014
When working with fast loaders, never ever read, mask, write dd00/02 to set vic-bank. Always do direct writes following the recommended protocol of the loader.
2016-12-01 10:59
oziphantom

Registered: Oct 2014
Posts: 490
Do you know where Krill define what you can/should write to DD00?
2016-12-01 13:35
chatGPZ

Registered: Dec 2001
Posts: 11386
dont touch dd02, write 0-3 to dd00
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