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6R6
Registered: Feb 2002
Posts: 244 |
Disabling AR freeze button
Is it possible to disable the Action
Replay freeze function 100% ?
In that case, please enlighten me... :)
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yago
Registered: May 2002
Posts: 332 |
The Action Replay (and almost any other Freezer) works via IRQ or NMI, then the AR-ROM is switched in.
If you disable all IRQs (e.g. SEI), and disable all NMIs (forcing a NMI and never acknowledging it), the freezer button should not work anymore.
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chatGPZ
Registered: Dec 2001
Posts: 11114 |
thats true.... however it can be pain in the ass to write a non trivial program with both nmi and irq disabled ... :=P |
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MagerValp
Registered: Dec 2001
Posts: 1055 |
Freezers don't use IRQs, or they wouldn't be able to freeze anything with an SEI in it. Final Cartridge and Action Replay trigger an NMI together with a kernal replacement.
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6R6
Registered: Feb 2002
Posts: 244 |
It has come to my knowledge that it is possible by
setting the Ultimax mode for zeropage $01.
I havent tested it yet, ehm..
I'll let you know....
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chancer
Registered: Apr 2003
Posts: 342 |
I have a few things which have AR freeze stopping.. an intro someone coded in TA. years ago.. it only works after the button has been pressed and u try to do a restart
i can dig out the code if ya that interested.
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Stryyker
Registered: Dec 2001
Posts: 465 |
I noticed a number of NMI routines mess with it bad. |
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chatGPZ
Registered: Dec 2001
Posts: 11114 |
anything based on cia timers that is not resynced to the rasterbeam each frame will fuck up after freeze+restart. check mathematica 4x4 parts for example, or any other demo with timer-based raster-routines. |
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Krill
Registered: Apr 2002
Posts: 2839 |
ar also freezes with irq+nmi disabled, it only fails if you enable the ultimax mode. then, however, your code must run from $0000-$0fff. quite a pain in the ass to code ;) |
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Style
Registered: Jun 2004
Posts: 498 |
Sorry to zombify this old thread, but here's something I dont understand:
You cant stop an action replay from driving the NMI line low, because it itself drives it high by default.. this is from my (albeit limited) understanding.
Question is, why doesnt having an AR cart plugged in mean that it becomes impossible to disable the restore key with the "avoid acknowledging an NMI" trick? |
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chatGPZ
Registered: Dec 2001
Posts: 11114 |
i'd also like krill to explain how ar would freeze with nmi and irq disabled, because i cant see that working ... |
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