Atari 400 Technical Reference Manual page 495

Hardware Register
OS Shadow
Name
Descri~tion
Address
Hex Dec Name
Address
Hex Dec
M3PF Missile 3 to Playfield Collisions
M3PL Missile 3 to Player
D003
DOOB
NMIEN Non-Maskable Interrupt (NMI)
NMIRES NMI reset
NMIST NMI Status
Enable D40E
D40F
D40F
POPF Player 0 to Playfield Collisions
POPL Player 0 to Player Collisions
PlPF Player 1 to Playfield Collisions
P1PL Player 1 to Player Collisions
P2PF Player 2 to Playfield Collisions
P2PL Player 2 to Player Collisions
P3PF Player 3 to Playfield Collisions
P3PL Player 3 to Player Collisions
PACTL Port A Control
PAL PAL/NTSC indictor
PBCTL Port B Control
PENH Light Pen Horizontal Position
PENV Light Pen Vertical Position
PMBASE Player Missile Base Address
PORTA Port A
PORTB Port A
POTO Pot 0
POT1 Pot 1
POT2 Pot 2
POT3 Pot 3
POT4 Pot 4
POT5 Pot 5
POT6 Pot 6
POT7 Pot 7 (right paddle controller)
POTGO Start POT Scan
Se~ence
PRIOR Priority Select
RANDOM Random number generator
SERIN Serial Port Input
SEROUT Serial Port output
SIZEM Sizes for all missiles
SIZEPO Size of Player 0
SIZEP1 Size of Player 1
SIZEP2 Size of Player 2
SIZEP3 Size of Player 3
SKCTL Serial Port Control
SKREST Reset Serial Port Status (SKSTAT)
SKSTAT Serial Port Status
STIMER Start Timer
TRIGO Joystick Controller Trigger 0
TRIGI Joystick Controller Trigger 1
TRIG2 Joystick Controller Trigger 2
TRIG3T Joystick Controller Trigger 3
VCOUNT Vertical Line Counter
VDELAY Verical Delay
VSCROL Vertical Scroll
WSYNC Wait for Horizontal Sync
V.6
D004
DOOC
D005
DOOD
D006
DOOE
D007
DOOF
D302
D014
D303
D40C
D40D
D407
D300
D301
D200
D201
D202
D203
D204
D205
D206
D207
D20B
DOlB
D20A
D20E
D20D
DOOC
D008
D009
DOOA
DOOB
D20F
D20A
D20F
D209
DOlO
DOll
D012
D013
D40B
D01C
D405
D40A
53251
53259
54286 Set to $40 by IRQ code
54287 written to by NMI code
54287 read by NMI code
53252
53260
53253
53261
53254
53262
53255
53263
54018 Set to
53268
54019 Set to
54284 LPENH
54285 LPENV
54279
$3C by IRQ Code
I I
$3C by IRQ Code
234 564
235 565
54016 STICKO.l 278.279 632.633
54017 STICK2,3 27A,27B 634,635
53760 PADDLO 270, 624
53761 PADDL1 271 625
53762 PADDL2 272 626
53763 PADDL3 273 627
53764 PADDL4 274 628
53765 PADDL5 275 629
53766 PADDL6 276 630
53767 PADDL7 277 631
53771 WRITTEN DURING VBLANK
53275 GPRIOR 26F 623
53770
53774
53773
53260
53256
53257
53258
53259
53775 SSKCTL
53770
53775
53769
53264 STRIGO
53265 STRIGL
53266 STRIG2
53267 STRIG3
54283
54276
54277
232
284
285
286
287
54282 Used by keyboard
click routine
562
644
645
646
647