Atari 400 Technical Reference Manual page 480

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13070
;2 TITLE "ATfiFtI
80rJ
CHFCYH .. "-.
["I',.~LH"'" p.',"
r.
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~0 COPYRIGHT ATARI 19813
413
50
60
THIS IS AN EXfiMPLE OF A DISPLAY LIST WHICH USES CHARHCTER MfiPPING TO
,PPO[)UCE THE CHECKERS fiN[) THE TOP
Ar~[)
80TTOt'l BORDERS OF THE BOARD.
70
80
; PLA''''ERS ARE USED FOR THE RED SQUARES. THIS GIVES 6 COLORS WITHOUT
; CHArm I NG THE' COLOR REG I STERS.
90 ,t1IS:=;ILES APE USED FOP THE LEFT AtJr) F'IGHT E-:(IF;[,ERS
~l~e ;THE PROGRfiM SlA~TS AT THE LUCATION SPECIFIED BY PMS.
~110 ;A FEW TRICKS ARE USED TO SAVE FtHM. BUT FURTHER OPTIMIZATION IS f~SSI8LE
0120 ) THIS IS A RAM BASED PROGRAt1 I-JHICH RUNS WITH THE A5SEt1BLER CARTRIDGE. NOT A
0n0 ; ROM CARTR I DOE.
01.40 ;
01.513 ; COLLEEN (ATARI 8(0) EQUATES
13160
01.70 CHBASE $D4139
01.813 Dt'lACTL
c:
$D4130
01.90 SDMCTL S022F
02013 HPospe SDe0e
02113 SIZEPe SDee8
02213 PCOLRe
=
se2C0
0230 SDLSTL se230
132413 SDLSTH
S0231.
0250 GRACTL SDe1D
02613 PMBASE SD4e7
132713 GPRIOR se26F
132813 VDSLST se2ee
132913 NMIEN $D4eE
0300
133113 ; DISPLAY LIST EQUATES
133213 ;
13:5313 INT S8e ; DISPLAY LIST INTERRUPT (BIT 7 OF NMI STATUS)
13340 JMPWT $41. ; JUMP AND WA I T UNT I L
H~D
OF NEXT VERT I CAL BLANK (3 B't'TES)
133513 RELOAD $413 ; RELOAD t1EM SCAN COUNTER (3 BYTES)
13360 VSC S2e ;VERTICAL SCROLL ENABLE
0370 HSC $10
; HORIZONTAL SCROLL ENABLE
03813 JUMP 1. ; JUMP I NSTRUCT I ON (3 B''''TES)
13390 BLANK1. 0 ; 1. BLANK TV LINE
13400 BLANK2 $1.13
; 2 BLANK LINES
134113 BLANK'3
S2e
; 3
0420 BLANK4
S30
; 4
0430 BLANKS $40 ;5
0440 BLANK6 $50
i
6
1345'21 BLANK7 $60 ; 7
04613 BLANK8 $70 ;8 BLANK TV LINES