[A83] Re: About _grbufcpy_v

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[A83] Re: About _grbufcpy_v


ION's fastcopy routine is in IONF.Z80, and is freely available.  Don't want 
to use ION?  Just paste the code into your own program...

One little problem with Ionfastcopy though is that on the rom 1.10 TI83-, 
the screen is updated too fast and causes an garbled staircase effect.

This routine from IONF.Z80:

;-----> Copy the gbuf to the screen (fast)
;Input:	nothing
;Output:graph buffer is copied to the screen
fastCopy:
	di
	ld	a,$80				; 7
	out	($10),a				; 11
	ld	hl,gbuf-12-(-(12*64)+1)		; 10
	ld	a,$20				; 7
	ld	c,a				; 4
	inc	hl				; 6 waste
	dec	hl				; 6 waste
fastCopyAgain:
	ld	b,64				; 7
	inc	c				; 4
	ld	de,-(12*64)+1			; 10
	out	($10),a				; 11
	add	hl,de				; 11
	ld	de,10				; 10
fastCopyLoop:
	add	hl,de				; 11
	inc	hl				; 6 waste
	inc	hl				; 6 waste
	inc	de				; 6
	ld	a,(hl)				; 7
	out	($11),a				; 11
	dec	de				; 6
	djnz	fastCopyLoop			; 13/8
	ld	a,c				; 4
	cp	$2B+1				; 7
	jr	nz,fastCopyAgain		; 10/1
	ret					; 10
; Critical timings:
;	command->command: 65
;	command->value  : 68
;	value  ->value  : 66
;	value  ->command: 67



>From: "TypeR unknown" <typerfuture@hotmail.com>
>Reply-To: assembly-83@lists.ticalc.org
>To: assembly-83@lists.ticalc.org
>Subject: [A83] About _grbufcpy_v
>Date: Tue, 27 Nov 2001 18:49:56 +0100
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>Is ION's fastcopy routine something like writing to the LCD driver from
>memory in one pass??
>
>I believe it was Ian Graf who has written such code, and is available in 
>ASM
>guru. Perhaps doing it this way won't require ION...
>
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