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Forums > C64 Coding > BRK and the stack
2019-06-29 23:52
xlar54

Registered: Dec 2018
Posts: 6
BRK and the stack

Hey folks, Im trying to track down a bug and at this point I need to know where in the program a BRK occurred. This image:

https://imgur.com/d1Insv5

contains the stack as seen by VICE. The SP is EE. I reset the break vector to an area where im just JMPing in a loop so i can look at this, so not much else should be disturbed.

Can someone help me understand this data and where the PC was when the brk occurred?
2019-06-30 00:10
Mixer

Registered: Apr 2008
Posts: 310
Perhaps this description can help http://unusedino.de/ec64/technical/aay/c64/bbrk.htm
2019-06-30 06:37
Knight Rider

Registered: Mar 2005
Posts: 62
what about watch 0316
2019-06-30 07:30
oziphantom

Registered: Oct 2014
Posts: 338
chis 50

the 30 is the status flags push. so my guess is $1762 is the brk
2019-06-30 15:55
xlar54

Registered: Dec 2018
Posts: 6
Quote: chis 50

the 30 is the status flags push. so my guess is $1762 is the brk


That was it, thanks. (actually that value -2).
2019-07-01 17:32
oziphantom

Registered: Oct 2014
Posts: 338
so it has 1764, and the actual break address was 1760?
2019-07-02 04:07
Style

Registered: Jun 2004
Posts: 487
Im with Oziphantom here, that makes no sense. BRK is implied, so PC + 2 should be pushed.
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