A83: Re: ram calls
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A83: Re: ram calls
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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