Re: [cc65] Print heart character on C64?

On Sat, Sep 18, 2004 at 10:33:32AM -0400, Raj Wurttemberg wrote:
> A little weirdness here. I told cc65 to use $73 but the .byte line in the
> assembly shows it was converted to a $53:
[...]
> Why did that happen? Am I doing something wrong? If I edit the assembly and
> change the $53 back to a $73 it works properly and displays the heart
> character.

As others have already explained, cc65 does a translation from the source
character set into the target character set for all character and string
literals. If cc65 wouldn't do that, things like

        printf ("Hello world!\n");

would not work as expected.

There are several ways to work around it, if you don't like what cc65 does:

  1. Use #pragma charmap() to redefine entries in the character translation
     table.

  2. Don't specifiy a target system when compiling (please note that this
     disables *all* character translation).

  3. Don't use string literals, use char arrays instead:

        const char foo [] = { 'H', 'e', 'l', 'l', 'o', 0x73, 0x00 };

  4. Move the strings into an assembler module. When a target system is
     specified, ca65 will also do character set translation, but it is easier
     to use string literals and numeric values together:

        .byte   "Hello world! ", $73, $00

Which method is better depends on the actual code. You can also use the method
shown by groepaz, but it will only work when using a printf like function.

Regards


        Uz


-- 
Ullrich von Bassewitz                                  uz@musoftware.de
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