Atari 400 Technical Reference Manual page 485

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ATARI Bee CHECKERS DISPLAY 9'/ (; SHAW ~/~1./80
5652
5652
57013 A92E
57132 BD2Fe2
57135 Agee
57137 AA
5709 9D0050
570B 9D0e51.
570E 9D0052
571.1. 9D0053
571.4 9D0054
571.7 EB
571.B D0EE
571.A A90E
571.C A05E
571.E 999451.
5721. 88
5722 D0FA
5724 A01.0
5726 A9C4
5728 991.~54
572B 99A354
572E 88
572F D0F7
5731. A9F0
573~ A20A
5735 991.852
5738 999852
573B 991.853
573E 999853
1.690
1.7130 ;
PAGE
1.
('1.0 ,
W IT
I ALIZAT
I Otl COC·E. --
S1 f-1PT E:.<ECUTI ot~
HEPE
1.720 ;
1.7313
*=
PMB+~70e
1.740 ;
1. 7513 ;
ItH
T OS
~
S DMACTL VAR I ABLE
1.760 ; IrlSTRUCTION FETCH DMA ENABLE, P/M 2 LINE RES, P/M DMA ENABLE, STANDARD SCREEN (1.613 CLOCKS)
1.770
1.780 LDA *S2E
1.790 STA SDMCTL
1.81313 ;
1.81.13 ; CLEAR RAM
1.820 ;
1.830 LOA *13
1.840 TAX
1.850 IN ITLP
1..860
1.870
1.880
1.890
1.900
1.91.0
1.920
1.930 ;
STA
STA
STA
STA
STA
INX
BNE
PMB,X
PMB+S1.00,X
PMB+$20e,X
PMB+$~0e,X
PMB+$400,X
INITLP
1.9413 ; INITIALIZE MISSILE GRAPHICS FOR BORDERS
1.950
1.9613
1.9713
1.9813 LQPZ
1.990
2000
201.0 ;
LDA
LD'T'
STA
DEY
BNE
*$0E
*S5E
GRt103+$1.4, Y
LQPZ
2020 ; I N I TI ALI ZE TOP AND BOTTOM BORDERS.
213313
2040
21350
21360 TBLP
213713
213813
21390
21.1313 ,
LDY
LOA
STA
STA
DE.,.'
BNE
*1.6
*CL80R+BORDER
TOPBRD-L Y
BOTBRD-L Y
TBLP
,CONTINUE UNTIL Y-0
21.1.13 ; INITIALIZE PLA'T'ER GRAPHICS FOR SQUARES (CHECKER BOARD)
yze
21.20 ;
21.30
21.413 IN2
21.513
IN~
21.613
21.70
21.80
21.913
LDA
LOX
STA
STA
STA
STR
*SF0
*1.13
GRPe+$1.8,Y
GRP1.+$1.8,Y
GRP2+S1.8,Y
GRP3+$1.8,Y