155 lines
5.0 KiB
NASM
155 lines
5.0 KiB
NASM
; -----------------------------------------------------------
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; defs.asm - hardware registers, constants, zero page, macros
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; included first by main.asm
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; -----------------------------------------------------------
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; ---- hardware registers ----
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RASTER = $d012 ; current raster line
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XCTRL = $d016 ; horizontal fine scroll + 38/40 column mode
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BORDER = $d020 ; border color register
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BG = $d021 ; background color register
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SCREEN = $0400 ; screen RAM (40x25 chars)
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COLRAM = $d800 ; color RAM
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SPRPTR = $07f8 ; sprite pointers (screen RAM + $3f8)
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CIA1_PA = $dc00 ; CIA1 port A: keyboard columns / joystick 2
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CIA1_PB = $dc01 ; CIA1 port B: keyboard matrix row read
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CIA1_TA = $dc04 ; CIA1 timer A low byte: free-running entropy
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; ---- sprite registers ----
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SPRPOS = $d000 ; sprite 0 x; +1 = y, +2 = sprite 1 x, ...
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SPR_MSBX = $d010 ; 9th bit of each sprite's x coordinate
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SPR_EN = $d015 ; sprite enable bits
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SPR_YEX = $d017 ; vertical expand
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SPR_PRIO = $d01b ; 1 = sprite behind the characters
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SPR_MC = $d01c ; multicolor enable
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SPR_XEX = $d01d ; horizontal expand
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SPR_MC1 = $d025 ; shared multicolor 1 (bit pair %01)
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SPR_MC2 = $d026 ; shared multicolor 2 (bit pair %11)
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SPR_COL = $d027 ; sprite 0 color, +1 = sprite 1, ...
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; ---- SID registers ----
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SID_BASE = $d400
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SID_V1FL = $d400 ; voice 1 frequency low
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SID_V1FH = $d401 ; voice 1 frequency high
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SID_V1PL = $d402 ; voice 1 pulse width low
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SID_V1PH = $d403 ; voice 1 pulse width high
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SID_V1CR = $d404 ; voice 1 control (waveform + gate)
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SID_V1AD = $d405 ; voice 1 attack/decay
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SID_V1SR = $d406 ; voice 1 sustain/release
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SID_V2FL = $d407 ; voice 2 frequency low
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SID_V2FH = $d408 ; voice 2 frequency high
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SID_V2PL = $d409 ; voice 2 pulse width low
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SID_V2PH = $d40a ; voice 2 pulse width high
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SID_V2CR = $d40b ; voice 2 control
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SID_V2AD = $d40c ; voice 2 attack/decay
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SID_V2SR = $d40d ; voice 2 sustain/release
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SID_V3FL = $d40e ; voice 3 frequency low
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SID_V3FH = $d40f ; voice 3 frequency high
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SID_V3PL = $d410 ; voice 3 pulse width low
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SID_V3PH = $d411 ; voice 3 pulse width high
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SID_V3CR = $d412 ; voice 3 control
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SID_V3AD = $d413 ; voice 3 attack/decay
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SID_V3SR = $d414 ; voice 3 sustain/release
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SID_VOL = $d418 ; filter mode + master volume
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; ---- SFX IDs ----
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SFX_SCORE = 0 ; rabbit dodged: high pling
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SFX_MISS = 1 ; rabbit hit: noise crash
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SFX_OVER = 2 ; game over: descending sweep
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SFX_CURSOR = 3 ; menu cursor move: click
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SFX_SELECT = 4 ; menu fire: rising tone
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NSFX = 5
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; ---- colors ----
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BLACK = 0
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WHITE = 1
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RED = 2
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CYAN = 3
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GREEN = 5
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BLUE = 6
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YELLOW = 7
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ORANGE = 8
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BROWN = 9
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DGREY = 11
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MGREY = 12
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LGREEN = 13
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LBLUE = 14
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LGREY = 15
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; ---- scene palette ----
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COL_SKY = LBLUE ; background above the horizon
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COL_GRASS = GREEN ; background below it
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COL_ROAD = MGREY ; road surface (inverse-space fill)
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COL_EDGE = WHITE ; painted road edge lines
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; ---- joystick port 2 bits (after read_joy, active high) ----
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JOY_LEFT = 4
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JOY_RIGHT = 8
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JOY_FIRE = 16
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; ---- game constants ----
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LANES = 5
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NRABBITS = 7 ; rabbit slots, hardware sprites 1-7
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MAX_MISS = 3
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ROAD_CX = 184 ; road center in sprite x coordinates
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PLAYER_SY = 179 ; double-sized scooter top (feet stay on line 221)
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T_BIG = 112 ; rabbit distance where the big frames start
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T_EXP = 192 ; ... and where the sprite gets double-sized
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REP_HOLD = 12 ; frames before a held direction auto-repeats
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REP_PERIOD = 6 ; frames between auto-repeat steps
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TREE_SPEED = 3 ; frames between tree scroll steps
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NTREES = 6 ; roadside trees per side-pair
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RAS_SYNC = 251 ; raster line polled for the frame sync
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RAS_SPLIT = 97 ; horizon line: sky/grass background split
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; ---- zero page pointers (same slots as the c64-demo) ----
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txtlo = $f5 ; text pointer for the print routines (2 bytes)
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txthi = $f6
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updvec = $f9 ; state update vector (2 bytes)
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scrlo = $fb
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scrhi = $fc
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collo = $fd
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colhi = $fe
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; ---- helper macros: print a normal / big text line ----
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!macro prtext .row, .col, .color, .txt, .len {
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lda #<.txt
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sta txtlo
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lda #>.txt
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sta txthi
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lda #.row
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sta prow
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lda #.col
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sta pcol
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lda #.color
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sta pcolor
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lda #.len
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sta plen
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jsr print_text
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}
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!macro prbig .row, .col, .color, .txt, .len {
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lda #<.txt
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sta txtlo
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lda #>.txt
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sta txthi
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lda #.row
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sta bigrow
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lda #.col
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sta bigcol
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lda #.color
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sta bigcolor
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lda #.len
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sta biglen
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jsr draw_big
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}
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; ---- set the state update vector ----
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!macro setupd .addr {
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lda #<.addr
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sta updvec
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lda #>.addr
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sta updvec+1
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}
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