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The Unlicense
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ATK - test chip ram banks as seen by custom chips ? #15

Open penfold42 opened 4 years ago

penfold42 commented 4 years ago

Another great piece of software from you - have you ever released anything crap ?!!

I’ve been working on resurrecting an old trapdoor expansion with a failed (unpublished) GAL.

I’ve obviously been making heavy use of ATK as part of this.

What I can’t 100% test is the chip ram banks as seen from the Agnus Denise and Paula.

Could you add video tests in each of the chip ram banks based on what’s detected ? Ie, an image at $00xxxx, $08xxxx, $10xxxx, $18xxxx

For bonus points borrow DiagROM scroll to test the blotter.

keirf commented 4 years ago

Do you suspect that the ram behaves differently when accessed by custom chips then? All accesses are mediated via Gary right?

penfold42 commented 4 years ago

Yep - this design uses CAS bank switching switching and there are a couple of jumpers for mapping options.

It’s first bank can live at $08xxxx and would become the second half of chip ram on the old 500.

If I screw up my logic, bad stuff could happen from Agnus side while looking good from the CPU