Lynx I vs Lynx II

[vince]

I'm searching a way to recognize in a program if it is executed on a Lynx I or Lynx II system.

 

It could be a difference between register initialisation, or something like that... (this test would probably the first thing in the program)

 

 

Any idea ?

[sage]

Write Stereo register, re-read register. if =0 => lynx 1

[vince]

Thanks a lot !

 

I'll try it.

[vince]

I made a test with a write then a read into 0xFD50 adress (MSTEREO) and I confirm : it allows you to make distinction between Lynx I and Lynx II

[vince]

Here is my test sample :

 

#include <lynx.h>

#include <lynxlib.h>

 

char SCREEN[8160] at (MEMTOP-16320);

char RENDER[8160] at (MEMTOP-8160);

 

char MSTEREO at 0xFD50;

 

char pal[]={

0x00,0x0F,0x00,0x0F,0x0F,0x00,0x0C,0x08,0x08,0x0F,0x08,0x08,0x08,0x08,0x04,0x0F,

0x00,0xFF,0x0F,0x0F,0x00,0xF0,0xCC,0x8C,0x88,0x8F,0xFF,0x4F,0x48,0xF0,0x08,0xFF

};

 

void Vsync()

{

#asm

vretrace:

lda $fd0a

bne vretrace

#endasm

}

 

main() {

unsigned char val;

 

InitIRQ();

CLI;

 

SetBuffers(SCREEN,RENDER,0);

 

SetRGB(pal);

 

MSTEREO=0x10;

 

DrawFBox(0,0,160,102,0);

 

val=MSTEREO;

 

if (val==0x10) {

DrawFBox(20,20,20,62,0x0F);

DrawFBox(60,20,20,62,0x0F);

} else {

DrawFBox(20,20,20,62,0x0F);

}

 

SwapBuffers();

 

Vsync();

 

for( ; ; ){

}

}

 

 

 

source : http://devlynx.ti-fr.../?pag=9&cat=111 (with comments, in french)

Edited May 9, 2012 by vince

[Shawn Jefferson]

Link isn't working.

 

What programming environment are you using? I've never seen "char MSTEREO at 0xFD50;" in C before (that I can remember).

[vince]

Concerning the link, it was an error of DNS this morning. It must be updated now.

 

I use the NEWCC65 environment. It does not includes reference to 0xFD50, wich is the adress of the MSTEREO register (http://devlynx.ti-fr.com/?pag=17&act=dtl&adr=0xFD50) so I added it in my code defining MSTEREO variable.

 

It would probably be better if I specify "unsigned char" instead of "char"...

[Shawn Jefferson]

Ah, that's why. Is that K&R syntax?

[vince]

Yes it is