Re: A83: Re: ram calls

To: assembly-83@lists.ticalc.org
Subject: Re: A83: Re: ram calls
From: benjamin99@juno.com (Alan C Johnson)
Date: Sun, 11 Oct 1998 21:31:02 -0500
Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-83@lists.ticalc.org

No kidding, what's the point?  If not everyone has the exact same thing
there, the idea won't work at all

On Sun, 11 Oct 1998 13:00:24 +0900 "James Matthews"
<matthews@tkb.att.ne.jp> writes:
>
>Woah, that's a pretty neat idea.  Not EXTREMELY useful, but pretty 
>damn cool :)
>
>What could you use it for though...what would have been cool is if 
>there was a BASIC support routine to call something like
>that.  But there isn't...:)
>
>:ater,
>
>James Matthews (matthews@tkb.att.ne.jp)
>
>ICQ: 7413754
>http://home.att.ne.jp/gold/tomcat21/index.html
>http://library.advanced.org/18242/
>
>----------
>> From: Phelan Wolf <phelanwolf@hotmail.com>
>> To: assembly-83@lists.ticalc.org
>> Subject: A83: ram calls
>> Date: Sunday, October 11, 1998 11:01 AM
>> 
>
>
>I tested my last theory, and it works.  I included two sample 
>programs, 
>ZRAMCALL.Z80, and ZCALLOFF.Z80.  You run ZRAMCALL to set up the calls, 
>
>then you run ZCALLOFF to run it.  Unfortunatly you can't do call _off 
>
>inside of the same program that sets it up.  I don't know why, but you 
>
>just can't.  Also 1340bytes of routines can be stored there.
>
>-Phelan 'Amen' Wolf
>
>  MIND YOU:  DO NOT RUN ZCALLOFF WITHOUT RUNNING ZRAMCALL FIRST.  IT 
>WILL CRASH YOUR CALC, I FOUND OUT THE HARD WAY. (i lost a basic 
>program 
>for chemistry, it was about 12K big, it took me forever to make.  as 
>you 
>might deduce i am incredibly angry.)
>
>;PROGRAM:ZRAMCALL.Z80
>;sets up ram call '_off'
>.nolist
>RAM_CALL = 8265h
>_off     = RAM_CALL
>
>.list
>.org 9327h
> ld hl,off         ;load the off routine
> ld de,RAM_CALL    ;where to put it
> ld bc,6           ;it is 6 bytes long
> ldir              ;copy the data
> ld hl,RAM_CALL+7  ;load where to place some zeros
> xor a             ;clear a
> ld (hl),a         ;load the 00 at 8265h+06h
> ld hl,off2        ;load the second part
> ld de,RAM_CALL+8  ;where to put it
> ld bc,6           ;it is 6 bytes long
> ldir              ;copy the data
> ret
>
>off:
> .db $f3,$3e,$01,$d3,$03,$3e,0
>off2:
> .db $d3,$04,$08,$d9,$fb,$c9,0
> 
>end
>.end
>
>;PROGRAM:ZCALLOFF
>;calls the ram call '_off'
>.nolist
>RAM_CALL = 8265h
>_off     = RAM_CALL
>
>.list
>.org 9327h
> call _off
>
>end
>.end
>
>
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