CC65 and the mega65-libc

Wirsing · 29. Oktober 2021

Hallöchen,

anyone an idea how to set the 80/50 char mode with the setscreensize function?

Here's my code that creates the stange thing in the screen shot.

#include "./include/conio.h"

int main (void)
{
conioinit();
setscreensize(80,50);
return 0;
}

any ideas?

thanks

wirs

PS: Compiled with:

cl65 hello.c conio.c memory.c -ohello.prg

everslick · 3. November 2021

maybe you just need to clear the screen afterwards? setscreensize() may not do it for you.

everslick · 3. November 2021

Code

1 void setscreensize(unsigned char w, unsigned char h)
2 {
3 if (w == 80)
4 SET_H640();
5 else if (w == 40)
6 CLEAR_H640();
7
8 if (h == 50)
9 SET_V400();
10 else if (h == 25)
11 CLEAR_V400();
12
13 // Cache values.
14 if (w == 40 || w == 80)
15 g_curScreenW = w;
16 if (h == 25 || h == 50)
17 g_curScreenH = h;
18 }

Alles anzeigen

it only sets the registers, and displays whatever is in the screen ram.

Wirsing · 4. November 2021

thanks, idea's not bad.

.....but after a clrscr i get this:

the chars at the top are flickering..... it look a little bit funny

mega65 · 7. November 2021

Check the address of the screen in $D060-$D063. Depending on your $D018 settings, it might be causing the screen to effectively be at $0000.

VG

Paul.

Wirsing · 14. November 2021

Thanks Paul.

I'll give it a try in the next days.

Currently i switched to kickc.

There are no problems, so far

cb3rob · 26. Januar 2023

looks like it changed the screen dimensions just fine... just that there either is not enough video ram there (wherever it's located now or you did not clear it it does look like 80x50 to me. (and whatever else this machine uses... attribute/color ram somewhere too no doubt. some 'already provided' clearscreen routines would also need to know the rows and columns count somehow (or at least the overall size and offset, the rows and columns apply more to cursor related stuff