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Atari coding BBS
| Re: jsr (a0) from within vbl |
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Posted by: mikro
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Jul,24.2009-08:40
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You don't terminate with RTE ('vbl' routine, as PeP mentioned, RTS can be used only in deferred VBL, not in direct $70)
Then there might be too early VBL init, i.e. you set VBL handler and only then you set that 'extraroutine', i.e. VBL might jump at null pointer.
Last thing I can think of is forgotten register save/restore, i.e. if your "extraroutine" uses some regs, don't forget to save/restore them (movem instruction), if you use deferred VBL, you don't have to do this but again, $70 is direct VBL call, you must do everything by yourself.
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Topic
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Posted by
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Date
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jsr (a0) from within vbl
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Per Almered (XiA)
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Jul,23.2009-18:51
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Re: jsr (a0) from within vbl
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PeP
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Jul,23.2009-19:28
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Re: jsr (a0) from within vbl
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Per Almered (XiA)
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Jul,23.2009-21:38
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Re: jsr (a0) from within vbl
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PeP
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Jul,24.2009-01:46
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Re: jsr (a0) from within vbl
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Per Almered/XiA
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Jul,24.2009-06:39
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Re: jsr (a0) from within vbl
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mikro
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Jul,24.2009-08:40
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Re: jsr (a0) from within vbl
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mikro
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Jul,24.2009-08:44
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Re: jsr (a0) from within vbl
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Per Almered (XiA)
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Jul,24.2009-09:26
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Re: jsr (a0) from within vbl
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mikro
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Jul,24.2009-10:35
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Re: jsr (a0) from within vbl
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PeP
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Jul,24.2009-15:40
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Re: jsr (a0) from within vbl
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Per Almered (XiA)
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Jul,24.2009-22:13
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What's the anti-troll code?
That's your personal code to be able to add comments and messages on the dhs.nu site.
Don't have a code or forgot it? Fix it here.
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