Re: A83: Will someone answer?

To: assembly-83@lists.ticalc.org
Subject: Re: A83: Will someone answer?
From: Jkhum98@aol.com
Date: Fri, 24 Sep 1999 23:20:31 EDT
Reply-To: assembly-83@lists.ticalc.org


In a message dated 9/24/99 10:12:31 PM Central Daylight Time, 123abc@chek.com 
writes:

> Can someone please show me how to pixel test in ASM?

Here is the Info off of TI's website. This should be what you need...

;-----------------------------------------------------------------------
;  _IPoint: Change a point on the screen, no clipping!
;
;    INPUT: Coordinate values input are integer and assumed
;       within screen values
;               B - X Coordinate of point to change - 0..94
;               C - Y Coordinate of point to change - 1..63
;       D - Command to perform  
;              0 - Set point to light
;              1 - Set point to dark
;              2 - Reverse point (XOR operation)
;                      3 - TEST PIXEL
;              4 - Copy from display buffer
;
;         OUTPUT:
;                FOR PIXEL TEST (3) Z=1 IF OFF, Z=0 IF ON
;
;     NOTES:
;       All register and flags are preserved
;               UNLESS PIXEL TEST IS THE COMMAMD THEN NO REGS ARE
;               PRESERVED.
;
;               No plotting occurs if point is outside
;       of current RANGE.
;
;       (BC) is (X,Y), the (0,0) point is lower left corner
;
;       Graphics always written to graphics buffer and/or
;               display RAM and, depending on PlotLoc flag.
;-----------------------------------------------------------------------

There ya go, cya...

Jason_K