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BRK-flag [message #137501]

Tue, 05 April 2005 06:07

Ruud.Baltissen
Messages: 64
Registered: July 2003

Karma:

Member

Hallo allemaal,

Experimenting with VICE I noticed something strange. In the monitor
mode the BRK-flag was 0. But stepping through the instructions PHP and
PLA A was $32 at the end, meaning the BRK-flag was set at the moment
of PHP. But the monitor command 'r' showed the BRK-flag was 0.

I realise that stepping is done by using the BRK instruction and that
this is the possible cause of the set BRK-flag. But then why doesn't
it show with 'r'?

But the reasob I started experimenting: the BRK-flag is set by the BRK
instruction. But what does it reset again? I couldn't find anthing
about it and the only thing I can think of is an IRQ.

Any comment is welcome!

--
___
/ __|__
/ / |_/ Groetjes, Ruud
\ \__|_\
\___| URL: Ruud.C64.org

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[Message index]

		BRK-flag By: Ruud.Baltissen on Tue, 05 April 2005 06:07
		Re: BRK-flag By: Martijn van Buul on Tue, 05 April 2005 06:57
		Re: BRK-flag By: Andreas Boose on Tue, 05 April 2005 13:26

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