Re: About CC65 inline assembly problem.

["Michael J. Mahon" <mjmahon@aol.com>]

bluebird wrote:
> I want to call inline assembly routine.
>
> void __fastcall__ displayCharA(void)
> {
>                 // Display char 'A'
> 	__asm__	(" LDA #$C1 \
> 		   JSR $FDED");
> }
>
> But it failed. So I tried like this.
>
> void __fastcall__ callCOUT(void)
> {
> 	__asm__	("		BIT $C082		\
> 					LDA #$C1		\
> 					JSR $FDED		\
> 					BIT	$C080");
> }
>
> Then it works.
> Is there anyone to talk about this problem?

From your example, it would appear that the monitor ROM (containing
$FDED) is normally switched out, and your reference to $C082 switches
it back in for the call, then out again before returning.

A cc65 expert could tell us whether this is the usual default state
while a program is running or not.

-michael

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