; globals ; Atari 2600 Equates VSYNC equ $00 ; 0000 00x0 Vertical Sync Set-Clear VBLANK equ $01 ; xx00 00x0 Vertical Blank Set-Clear WSYNC equ $02 ; ---- ---- Wait for Horizontal Blank RSYNC equ $03 ; ---- ---- Reset Horizontal Sync Counter NUSIZ0 equ $04 ; 00xx 0xxx Number-Size player/missle 0 NUSIZ1 equ $05 ; 00xx 0xxx Number-Size player/missle 1 COLUP0 equ $06 ; xxxx xxx0 Color-Luminance Player 0 COLUP1 equ $07 ; xxxx xxx0 Color-Luminance Player 1 COLUPF equ $08 ; xxxx xxx0 Color-Luminance Playfield COLUBK equ $09 ; xxxx xxx0 Color-Luminance Background CTRLPF equ $0A ; 00xx 0xxx Control Playfield, Ball, Collisions REFP0 equ $0B ; 0000 x000 Reflection Player 0 REFP1 equ $0C ; 0000 x000 Reflection Player 1 PF0 equ $0D ; xxxx 0000 Playfield Register Byte 0 PF1 equ $0E ; xxxx xxxx Playfield Register Byte 1 PF2 equ $0F ; xxxx xxxx Playfield Register Byte 2 RESP0 equ $10 ; ---- ---- Reset Player 0 RESP1 equ $11 ; ---- ---- Reset Player 1 RESM0 equ $12 ; ---- ---- Reset Missle 0 RESM1 equ $13 ; ---- ---- Reset Missle 1 RESBL equ $14 ; ---- ---- Reset Ball AUDC0 equ $15 ; 0000 xxxx Audio Control 0 AUDC1 equ $16 ; 0000 xxxx Audio Control 1 AUDF0 equ $17 ; 000x xxxx Audio Frequency 0 AUDF1 equ $18 ; 000x xxxx Audio Frequency 1 AUDV0 equ $19 ; 0000 xxxx Audio Volume 0 AUDV1 equ $1A ; 0000 xxxx Audio Volume 1 GRP0 equ $1B ; xxxx xxxx Graphics Register Player 0 GRP1 equ $1C ; xxxx xxxx Graphics Register Player 1 ENAM0 equ $1D ; 0000 00x0 Graphics Enable Missle 0 ENAM1 equ $1E ; 0000 00x0 Graphics Enable Missle 1 ENABL equ $1F ; 0000 00x0 Graphics Enable Ball HMP0 equ $20 ; xxxx 0000 Horizontal Motion Player 0 HMP1 equ $21 ; xxxx 0000 Horizontal Motion Player 1 HMM0 equ $22 ; xxxx 0000 Horizontal Motion Missle 0 HMM1 equ $23 ; xxxx 0000 Horizontal Motion Missle 1 HMBL equ $24 ; xxxx 0000 Horizontal Motion Ball VDELP0 equ $25 ; 0000 000x Vertical Delay Player 0 VDELP1 equ $26 ; 0000 000x Vertical Delay Player 1 VDELBL equ $27 ; 0000 000x Vertical Delay Ball RESMP0 equ $28 ; 0000 00x0 Reset Missle 0 to Player 0 RESMP1 equ $29 ; 0000 00x0 Reset Missle 1 to Player 1 HMOVE equ $2A ; ---- ---- Apply Horizontal Motion HMCLR equ $2B ; ---- ---- Clear Horizontal Move Registers CXCLR equ $2C ; ---- ---- Clear Collision Latches ; Read Address Registers ; bit 7 bit 6 CXM0P equ $0 ; xx00 0000 Read Collision M0-P1 M0-P0 CXM1P equ $1 ; xx00 0000 M1-P0 M1-P1 CXP0FB equ $2 ; xx00 0000 P0-PF P0-BL CXP1FB equ $3 ; xx00 0000 P1-PF P1-BL CXM0FB equ $4 ; xx00 0000 M0-PF M0-BL CXM1FB equ $5 ; xx00 0000 M1-PF M1-BL CXBLPF equ $6 ; x000 0000 BL-PF ----- CXPPMM equ $7 ; xx00 0000 P0-P1 M0-M1 INPT0 equ $8 ; x000 0000 Read Pot Port 0 INPT1 equ $9 ; x000 0000 Read Pot Port 1 INPT2 equ $A ; x000 0000 Read Pot Port 2 INPT3 equ $B ; x000 0000 Read Pot Port 3 INPT4 equ $C ; x000 0000 Read Input (Trigger) 0 INPT5 equ $D ; x000 0000 Read Input (Trigger) 1 ; Atari 2600 RIOT Memory Map ; RAM equ $80 ; 80-FF, also shadowed to $180-$1FF SWCHA equ $280 ; Port A data register for joysticks: ; Bits 4-7 for player 1. Bits 0-3 for player 2. SWACNT equ $281 ; Port A data direction register (DDR) SWCHB equ $282 ; Port B data (console switches) SWBCNT equ $283 ; Port B DDR INTIM equ $284 ; Timer output TIM1T equ $294 ; set 1 clock interval TIM8T equ $295 ; set 8 clock interval TIM64T equ $296 ; set 64 clock interval T1024T equ $297 ; set 1024 clock interval