Re: Normal mode patch

[Yoshinori K. Okuji]

On Friday 09 January 2004 10:50, Gianluca Guida wrote:
> As Marco Gerards made me note, the problem in vga.c was due to a
> wrong check to ypos value for scrolling (TEXT_HEIGHT instead of
> TEXT_HEIGHT-1).

Ah, it's great that you found it! I was really stupid.

> After fixing this, however, I've experienced another problem: the
> scrolling itself doesn't work. It clears the screen instead of moving
> it. I am not at all a VGA expert, and as long as my brain works at
> late night it seems that when using pupa_memmove the memory is read
> as zero-valued.

I see. I think I will be able to fix this problem easily. Thank you for 
your information.

> I've then implemented a slow but simple and working function that
> rebuilds completely the screen using textbuf info. I've called it
> screen_update(). Under bochs runned on a Pentium MMX (;-)) it showed
> slow, but on real hardware (Pentium III 600Mhz) its speed was
> acceptable.

As long as someone is using 386, it should be fast even on bochs. In my 
experience, Bochs on Celeron 850MHz is as slow as 386.

Okuji