Re: [cc65] Need help getting started with cc65 NES

The copy section you mention looks like this:

LDA #$05
STA $0A
LDA #$8A
STA $0B
LDA #$00
STA $0C
LDA #$60
STA $0D
LDX #$00

I'm not familiar enough with 6502 assembly to know if that is right or not.

Also, I understand your argument regarding the init code.

Thanks,
Paul

Ullrich von Bassewitz wrote:

>
>Ok. If there is no code, it cannot be executed:-) So either there's no RAM, or
>the copy operation fails for some reason. If you look at the startup code in
>the crt0.s file, you will notice a block of code that starts with
>
>        ; Copy the .data segment to RAM
>
>This is the code that copies that initialization data from the ROM into the
>RAM. Please check if this code works (it probably won't). That means, if a
>copied byte does actually appear at the target location. Unfortunately, I
>don't have any ideas what might be wrong besides missing or non writable RAM
>at $6000.
>

>The startup code is always needed, because it does things like initialize the
>bss segment, setup the stack and so on. Without the startup code, the
>translated C code won't work. Simpler code (like the one from my earlier mail)
>will still have the startup code prepended, but almost no additional library
>initialization code added. The library initialization code is what is called
>from the initlib routine. Using explicit calls to init routines is a bad idea.
>For one, it is difficult to oversee, which calls are needed, because this
>depends on the target platform and which library routines are used. Second, a
>special calling order has to be used. And third, the compiler would violate
>the standard, because a simple
>
>        #include <stdlib.h>
>        #include <stdio.h>
>
>        int main (void)
>        {
>            printf ("hello world!\n");
>            return EXIT_SUCCESS;
>        }
>
>would no longer work.
>
>Regards
>
>
>        Uz
>
>
>  
>
----------------------------------------------------------------------
To unsubscribe from the list send mail to majordomo@musoftware.de with
the string "unsubscribe cc65" in the body(!) of the mail.