RE: BASIC for the CBM-II/8088

Hallo Michał, Mia and others,

 
> And while we are at it, did you two ever consider my idea to make a part of
> the ram remappable to $B0000 or $B8000 to be able to emulate a PC display
> card?

Going through my sources I ran into a piece of code that handles clearing the screen. And I noticed it was writing directly into the screen memory, something that should not be done regarding the CBM-II. When I started coding this was one of the first pieces I wrote. And I wrote it with reason I just found out again. The next code:
 

	mov	cx,80*25		; 80 columns, 25 rows
.L100:
	mov	ax,0E20h 		; =  mov al,' '  +  mov ah,0Eh
	mov	bx,7
	int	10h

	loop	.L100


needs about 2 seconds to clear a screen; you see the cursor running over the screen. So unless someone has a better routine or another idea, I support this remap idea.


Met vriendelijke groet / With kind regards, Ruud Baltissen

www.Baltissen.org





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