Re: A85: Help with user memory

To: assembly-85@lists.ticalc.org
Subject: Re: A85: Help with user memory
From: mgp4007@omega.uta.edu (Michael Pearce)
Date: Fri, 10 Apr 1998 05:02:34 GMT
Delivered-To: assembly-85-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <d400f6f6.352da4ca@aol.com>
References: <d400f6f6.352da4ca@aol.com>
Reply-To: assembly-85@lists.ticalc.org

there are no other areas in memory that large.  you can do something
like this -

   ld hl,(VAT_END)              ;one byte before end of VAT
   ld a,h                       ;\
   sub 4                        ; |decrease hl by 1024
   ld h,a                       ;/
   ld (VIRTUALSCREEN),hl        ;save location of virtual screen
   ld de,(FIRST_FREE)           ;first free byte of memory
   or a                         ;\ is new area of virtual screen
   sbc hl,de                    ;/  all in free memory?
   jr nc,StartSolsKey           ;got enough memory so start 'er up
   ld hl,$0403                  ;else display message of not enough
mem
   ld ($800C),hl
   ld hl,&MemErrorText
   call D_ZT_STR
   call OTH_PAUSE
   ret                          ;exit the game

MemErrorText:
.db "Need 1KB free!",0

VIRTUALSCREEN is word in memory to store the address of the 1024 bytes
(so change to whatever you want).  it jumps to the StartSolsKey label
if successful.  i have a polygon routine (not working 100% but pretty
close) on my web page that may interest you -
http://ti85games.home.ml.org .

-mike

On Fri, 10 Apr 1998 00:49:13 EDT, you wrote:

>
>Err, I have a slight problem.  Can anyone tell me of any usermemory (i.e. 1024
>byte chunks) OTHER than GRAPH_MEM or VIDEO_MEM?  I'm making a polygon
>Animation thingie (wireframe, but somewhat like Final fantasy 7's fighting
>sequence).  And I need to know where to store all those d@mned matrices. :-D
>
>Thanks. 
>-Josh Morris
> DorkReMi@aol.com.
>

References:

A85: Help with user memory

From: DorkReMi <DorkReMi@aol.com>