Atari 400 Technical Reference Manual page 91

106
Timer Timer Value
3 CDTMV3 [021C,2]
4 CDTMV4 [021E,2]
5 COTMV5 [0220,2]
Timer Flag
COTMF3 [022A,1]
COTMF4 [022C,1]
COTMF5 [022E,l]
A character is read Irom the POKEY keyboard register and
stored in CH [02FC], if auto repeat is ac t i ve.
The stage 2 V8LANK process decrements the keyboard debounce
counter if it is not equal to zero, and if no key is
pressed.
The stage 2 VBLANK process processes the keyboard auto
repeat (see Appendix L, E8).
The stage 2 VBLANK process reads game controller data from
the hardware to the RAM data base, as shown below:
Hardware
Register
PORTA
PORTB
POT 0
POT
1
POT 2
POT 3
POT 4
POT 5
POT 6
POT 7
TRIGO
TRIGl
TRIG2
TRIG3
[D300]
[0301]
[D200]
[D201]
[0202]
[D203]
[D204]
[D205]
[0206]
[D207]
[D001]
[D002]
[D003]
[D004]
Data Base Function
Item
STICKO [0278]
~oysticks
and
STICKl [0279]
PTRIGO [027C]
Paddle Controllers
PTRIGl [027D]
PTRIG2 [027E]
PTRIG3 [027F]
STICK2 [027A]
STICf.<.3 [0278]
PTRIG4 [0280]
PTRIG5 [0281]
PTRIG6 [0282]
PTRIG7 [0283]
PADDLO [0270]
Paddle Controllers
PAOOLl [0271]
PADDL2 [0272]
PADDL3 [0273]
PADDL4 [0274]
PAODL5 [0275]
PADDL6 [0276]
PADDL7 [0277]
STRIGO [0284]
~oystick
triggers.
STRIGl [0285]
STRIG2 [0286]
STRIG3 [0287]
OPERATING SYSTEM C016555 -- Section 6