[A83] Re: Partial FastCopy

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: Partial FastCopy
From: crono@ifrance.com
Date: Mon, 22 Jul 2002 20:03:31 +0200
In-Reply-To: <002601c231a3$07d0f440$3e891581@BSTERNERL>
Reply-To: assembly-83@lists.ticalc.org


Yes, Ion FastCopy works column after column, but it's not useful for 
what I want to do, that is refreshing the first LINES of the screen.


22/07/02 19:12:59, Brandon Sterner <bms9019@rit.edu> a écrit:

>
>You probably don't want to modify fastcopy to do this... joe wrote it 
so
>that it displayed columns each iteration through the loop.
>
>brandon sterner
>
>----- Original Message -----
>From: <crono@ifrance.com>
>To: <assembly-83@lists.ticalc.org>
>Sent: Monday, July 22, 2002 8:26 AM
>Subject: [A83] Partial FastCopy
>
>
>>
>> I want to write a routine based on IonFastCopy, than refleshes only
>> the first X lines of the screen, but I don't fully undrestand how 
does
>> work the port 10 :
>>
>> To point to the highest line of the screen, we have to do :
>> ld a,80h ; 80h=128d=%10000000
>> out (10),a
>> And to point to the leftmost column, we have to do:
>> ld a,20h ; 20h=32h=%00100000
>> out (1O),a
>>
>> So after doing these 2 commands, the port 10 is set like that:
>> %10100000
>> Right ?
>>
>> Now I begin to doubt :
>> because, by default, the LCD driver is in X-increment mode, after 
each
>> writing throught the port 11, the X-coordinate (that is in fact the 
#
>> of the row !?) is increased, right ?
>>
>> It means that the port 10 is like that :
>> %10100001
>> then:
>> %10100010
>> etc.
>>
>> ... I'm lost !
>>
>> So, can somebody explain this to me, and how can I modify the 
FastCopy
>> routine in order to refresh only the first X lines of the screen ?
>>
>>
>>
>>
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References:

[A83] Re: Partial FastCopy

From: Brandon Sterner <bms9019@rit.edu>