Re: [cc65] a question about the write function

Hello,

On 2/12/07, Ullrich von Bassewitz <uz@musoftware.de> wrote:

> What about other programs, do they work? CallOutFunc is just a jmp instruction
> in the data segment (because it is modified at runtime). It looks like this:
>

Other programs work properly without printf or sprintf. Ive done peek
and poke @ $6000 and my emulator has RAM at that location. My hardware
works too, it has RAM installed at that location.

What is the code that is suppose to be at $6000? is it just a jump? If
it is, then to which location does it needs to go. Also, what is meant
by this:

/* Type of the function that is called to output data */
typedef void (*outfunc) (struct outdesc* desc, const char* buf, unsigned count);

that's from __printf.h

Is it write() or outfunc() that I need to implement?

> -----------------------------------------------------------------------------
> .data
>
> ; Stuff from OutData. Is used as a vector and must be aligned
> CallOutFunc:    jmp     $0000
> -----------------------------------------------------------------------------
>
> Since the contents of CallOutFunc on your system seems to be $01/$00/$??,
> while the source says it should be $20/$00/$00, the file is either not loaded
> correctly, or the data gets corrupted at runtime.
>

Actually, some piece of code in STARTUP i believe does this:

$8042:A0 00     LDY #$00
$8044:B1 0A     LDA ($0A),Y @ $8AD5 = #$01
$8046:91 0C     STA ($0C),Y @ $6000 = #$01
$8048:C8        INY
$8049:C0 30     CPY #$30
$804B:D0 F7     BNE $8044

This writes data to 0x30 memory locations starting at $6000 with $01.
On entry in _main, the memory locations still contain 0x01.

My command line for ld65 is:
--dbgfile debug.txt -t nes -m $(FileTitle)_map.txt -o $(FileTitle).nes
nes.o $(FileTitle).o $(UserInput) uart.o timer.o nes.lib

Thanks for the support.
JA
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