Re: A86: Typing in letters

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Typing in letters
From: Grams Family <grams@netcarrier.com>
Date: Wed, 29 Oct 1997 21:45:52
In-Reply-To: <345841EA.7CA0@algonet.se>
References: <01bce4bd$0d805f80$8604450c@caesar>
Reply-To: assembly-86@lists.ticalc.org

At 12:14 AM 10/30/97 -0800, you wrote:
>Brian wrote:
>> 
>>  Is there an easier way to detect a person pressing a any letter on
>> the the calc and then displaying that letter rather than going through
>> and checking for every letter like so
>
>Yes, by using CPIR:
>

Yeah, but comparing a to 26 values can be kind of slow. I like to use
tables. (i.e. just use the key_code as an offset into the table) It's
faster, and it doesn't take up much more space. When I was writing
JMemView, I was using almost all of the keys, and I found it took a
noticeable amount of time to do all those compares. Here's code for that
way...

   call GET_KEY
   ld hl,(char_table)
   ld c,a
   ld b,0
   add hl,bc
   ld a,(hl)

char_table:
   .db "     "
   .db "     "
   .db "XTOJE"
   .db "   WS"
   .db "NID  "
   .db "ZVRMH"
   .db "C  YU"
   .db "QLGB "
   .db "   PK"
   .db "FA"

note, this is NOT a complete routine, just a code fragment... And I'm not
sure the char_table is exactly right.

--Joshua

References:

A86: Typing in letters

From: "Brian" <CAESAR.CAT@worldnet.att.net>

Re: A86: Typing in letters

From: Jimmy Mårdell <mja@algonet.se>