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Old 08 August 2019, 17:29   #1
Giants
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MKIII - Action replay :: BreakPoint

Hi !
Since a lot of time and so version of WinUAE, I noticed something with the use of MKIII and WinUAE.
On some Game code, BreakPoint function under the MKIII does not work really.

The breakpoint is well reached BUT, we don't automatically enter to AR.
(the screen remains black, frozen)
We have enter to AR to see the message BreakPoint reased at ...

Strange isn't it ?
Any Idea ?

I don't have this 'problem', with Cycle-Exact(Full) tick.

Last edited by Giants; 08 August 2019 at 17:35.
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Old 16 August 2019, 18:23   #2
Toni Wilen
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Join Date: Aug 2001
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Age: 44
Posts: 22,933
Action Replay is the strange one. You may have noticed breakpoint executes trap instruction which jumps to address $40. It has tiny loop (CIA read and bra). CIA read triggers cartridge to generate NMI (if breakpoint is enabled) in this situation and cartridge code only "accepts" it if stacked PC points to bra. If it points to CIA read, cartridge ignores the NMI (which happens in non-CE mode).

Different timing adjustment is needed for non-CE mode (This probably worked in some older version where AR2/3 emulation was not as accurate as it is now). Other break point modes does something similar.
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