Falcon 030 Power 2/F030_POWER2.iso/ST_STE/MAGS/STOSBTS2.ARJ/stosbts2.msa/DATA/RESET1.DAT

Text File | 1987-04-22 | 2KB | 37 lines

My god!! he's back at last, now after 6-8 weeks of not doing any
articles for the ne new issue of BITS, Eddie of the Happening
Boiz is back, this time its only a short piece, this article is
going to introduce the use of RESET routines in STOS programs,
everybody knows that almost all demos have reset demos, so when
you try a quit from the main demo, you get another screen, which
you can't get out of, the routine in this article is only very
simple, it just displays a screen!!, boring I know but
music,noving sprites comes later, much later!, now onto the STOS
source.....

Lines 70 - 210 these just set up the screen, get the palette of
screen 15, reserve 32 bytes for the palette, then the palette of
screen 15 is pushed into the 16 words in bank 2 using the DOKE,
and DEEK commands.

Line 250 - AREG(0) is set to point at start(15) - this is the
address of the picture data we want to display when the reset
button is pressed.

Line 260 - AREG(1) is set to point at the palette data in bank 2,
eg AREG(1)=start(2), simple eh??

Line 270 - CALL 1 , this is the machine code program that I
wrote, this inititilises the reset routine, stores the position
of the picture data, and paltte data, and returns.

Now when you press the button, you will get you picture on the
screen!!!, remember, if you erase bank 15 or 2, AFTER the routine
has been called, then when activated the computer MAY crash, also
sometimes when you press reset the planes of the picture are
shifted across, so the colours are all messed up,this can be
cured by pressing it again!

Well thats it for this article..............Eddie 21 Oct '91