mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-11-24 12:31:25 +00:00
376 lines
11 KiB
PHP
376 lines
11 KiB
PHP
.setcpu "6502X"
|
|
|
|
; TIA write registers
|
|
|
|
VSYNC := $00 ; ---- --1- This address controls vertical sync time by writing D1 into the VSYNC latch.
|
|
VBLANK := $01 ; 76-- --1- 1=Start VBLANK, 6=Enable INPT4, INPT5 latches, 7=Dump INPT1,2,3,6 to ground
|
|
WSYNC := $02 ; ---- ---- This address halts microprocessor by clearing RDY latch to zero. RDY is set true again by the leading edge of horizontal blank.
|
|
RSYNC := $03 ; ---- ---- This address resets the horizontal sync counter to define the beginning of horizontal blank time, and is used in chip testing.
|
|
NUSIZ0 := $04 ; --54 -210 \ 0,1,2: player copys'n'size, 4,5: missile size: 2^x pixels
|
|
NUSIZ1 := $05 ; --54 -210 /
|
|
COLUP0 := $06 ; 7654 321- color player 0
|
|
COLUP1 := $07 ; 7654 321- color player 1
|
|
COLUPF := $08 ; 7654 321- color playfield
|
|
COLUBK := $09 ; 7654 321- color background
|
|
CTRLPF := $0A ; --54 -210 0=reflect playfield, 1=pf uses player colors, 2=playfield over sprites 4,5=ballsize:2^x
|
|
REFP0 := $0B ; ---- 3--- reflect player 0
|
|
REFP1 := $0C ; ---- 3--- reflect player 1
|
|
PF0 := $0D ; DCBA ---- \ Playfield bits: ABCDEFGHIJKLMNOPQRST
|
|
PF1 := $0E ; EFGH IJKL > normal: ABCDEFGHIJKLMNOPQRSTABCDEFGHIJKLMNOPQRST
|
|
PF2 := $0F ; TSRQ PONM / reflect: ABCDEFGHIJKLMNOPQRSTTSRQPONMLKJIHGFEDCBA
|
|
RESP0 := $10 ; ---- ---- \
|
|
RESP1 := $11 ; ---- ---- \
|
|
RESM0 := $12 ; ---- ---- > reset players, missiles and the ball. The object will begin its serial graphics at the time of a horizontal line at which the reset address occurs.
|
|
RESM1 := $13 ; ---- ---- /
|
|
RESBL := $14 ; ---- ---- /
|
|
AUDC0 := $15 ; ---- 3210 audio control voice 0
|
|
AUDC1 := $16 ; ---- 3210 audio control voice 1
|
|
AUDF0 := $17 ; ---4 3210 frequency divider voice 0
|
|
AUDF1 := $18 ; ---4 3210 frequency divider voice 1
|
|
AUDV0 := $19 ; ---- 3210 audio volume voice 0
|
|
AUDV1 := $1A ; ---- 3210 audio volume voice 1
|
|
GRP0 := $1B ; 7654 3210 graphics player 0
|
|
GRP1 := $1C ; 7654 3210 graphics player 1
|
|
ENAM0 := $1D ; ---- --1- enable missile 0
|
|
ENAM1 := $1E ; ---- --1- enable missile 1
|
|
ENABL := $1F ; ---- --1- enable ball
|
|
HMP0 := $20 ; 7654 ---- write data (horizontal motion values) into the horizontal motion registers
|
|
HMP1 := $21 ; 7654 ---- write data (horizontal motion values) into the horizontal motion registers
|
|
HMM0 := $22 ; 7654 ---- write data (horizontal motion values) into the horizontal motion registers
|
|
HMM1 := $23 ; 7654 ---- write data (horizontal motion values) into the horizontal motion registers
|
|
HMBL := $24 ; 7654 ---- write data (horizontal motion values) into the horizontal motion registers
|
|
VDELP0 := $25 ; ---- ---0 delay player 0 by one vertical line
|
|
VDELP1 := $26 ; ---- ---0 delay player 1 by one vertical line
|
|
VDELBL := $27 ; ---- ---0 delay ball by one vertical line
|
|
RESMP0 := $28 ; ---- --1- keep missile 0 aligned with player 0
|
|
RESMP1 := $29 ; ---- --1- keep missile 1 aligned with player 1
|
|
HMOVE := $2A ; ---- ---- This address causes the horizontal motion register values to be acted upon during the horizontal blank time in which it occurs.
|
|
HMCLR := $2B ; ---- ---- This address clears all horizontal motion registers to zero (no motion).
|
|
CXCLR := $2C ; ---- ---- clears all collision latches
|
|
|
|
; TIA read registers
|
|
|
|
CXM0P := $00 ; xx00 0000 Read Collision M0-P1 M0-P0
|
|
CXM1P := $01 ; xx00 0000 M1-P0 M1-P1
|
|
CXP0FB := $02 ; xx00 0000 P0-PF P0-BL
|
|
CXP1FB := $03 ; xx00 0000 P1-PF P1-BL
|
|
CXM0FB := $04 ; xx00 0000 M0-PF M0-BL
|
|
CXM1FB := $05 ; xx00 0000 M1-PF M1-BL
|
|
CXBLPF := $06 ; x000 0000 BL-PF -----
|
|
CXPPMM := $07 ; xx00 0000 P0-P1 M0-M1
|
|
INPT0 := $08 ; x000 0000 Read Pot Port 0
|
|
INPT1 := $09 ; x000 0000 Read Pot Port 1
|
|
INPT2 := $0A ; x000 0000 Read Pot Port 2
|
|
INPT3 := $0B ; x000 0000 Read Pot Port 3
|
|
INPT4 := $0C ; x000 0000 Read Input (Trigger) 0
|
|
INPT5 := $0D ; x000 0000 Read Input (Trigger) 1
|
|
|
|
; RIOT
|
|
|
|
SWCHA := $0280
|
|
SWACNT := $0281
|
|
SWCHB := $0282
|
|
SWBCNT := $0283
|
|
INTIM := $0284 ; Timer output
|
|
TIMINT := $0285
|
|
|
|
TIM1T := $0294
|
|
TIM8T := $0295
|
|
TIM64T := $0296
|
|
TIM1024T := $0297
|
|
|
|
;-------------------------------------------------------------------------------
|
|
; SLEEP duration
|
|
; Original author: Thomas Jentzsch
|
|
; Inserts code which takes the specified number of cycles to execute. This is
|
|
; useful for code where precise timing is required.
|
|
; ILLEGAL-OPCODE VERSION DOES NOT AFFECT FLAGS OR REGISTERS.
|
|
; LEGAL OPCODE VERSION MAY AFFECT FLAGS
|
|
; Uses illegal opcode (DASM 2.20.01 onwards).
|
|
|
|
.macro SLEEP cycles
|
|
.if cycles < 0 || cycles = 1
|
|
.error "MACRO ERROR: 'SLEEP': Duration must be >= 2"
|
|
.endif
|
|
.if cycles & 1
|
|
.ifndef NO_ILLEGAL_OPCODES
|
|
nop 0
|
|
.else
|
|
bit VSYNC
|
|
.endif
|
|
.repeat (cycles-3)/2
|
|
nop
|
|
.endrep
|
|
.else
|
|
.repeat cycles/2
|
|
nop
|
|
.endrep
|
|
.endif
|
|
.endmacro
|
|
|
|
;-------------------------------------------------------------------------------
|
|
; VERTICAL_SYNC
|
|
; revised version by Edwin Blink -- saves bytes!
|
|
; Inserts the code required for a proper 3 scanline vertical sync sequence
|
|
; Note: Alters the accumulator
|
|
|
|
; OUT: A = 0
|
|
|
|
.macro VERTICAL_SYNC
|
|
lda #%1110 ; each '1' bits generate a VSYNC ON line (bits 1..3)
|
|
.local VSLP1
|
|
VSLP1: sta WSYNC ; 1st '0' bit resets Vsync, 2nd '0' bit exit loop
|
|
sta VSYNC
|
|
lsr
|
|
bne VSLP1 ; branch until VYSNC has been reset
|
|
.endmacro
|
|
|
|
;-------------------------------------------------------
|
|
; Usage: TIMER_SETUP lines
|
|
; where lines is the number of scanlines to skip (> 2).
|
|
; The timer will be set so that it expires before this number
|
|
; of scanlines. A WSYNC will be done first.
|
|
|
|
.macro TIMER_SETUP lines
|
|
.local cycles
|
|
cycles = ((lines * 76) - 13)
|
|
; special case for when we have two timer events in a line
|
|
; and our 2nd event straddles the WSYNC boundary
|
|
.if (cycles .mod 64) < 12
|
|
lda #(cycles / 64) - 1
|
|
sta WSYNC
|
|
.else
|
|
lda #(cycles / 64)
|
|
sta WSYNC
|
|
.endif
|
|
sta TIM64T
|
|
.endmacro
|
|
|
|
;-------------------------------------------------------
|
|
; Use with TIMER_SETUP to wait for timer to complete.
|
|
; Performs a WSYNC afterwards.
|
|
|
|
.macro TIMER_WAIT
|
|
.local waittimer
|
|
waittimer:
|
|
lda INTIM
|
|
bne waittimer
|
|
sta WSYNC
|
|
.endmacro
|
|
|
|
;-------------------------------------------------------------------------------
|
|
; CLEAN_START
|
|
; Original author: Andrew Davie
|
|
; Standardised start-up code, clears stack, all TIA registers and RAM to 0
|
|
; Sets stack pointer to $FF, and all registers to 0
|
|
; Sets decimal mode off, sets interrupt flag (kind of un-necessary)
|
|
; Use as very first section of code on boot (ie: at reset)
|
|
; Code written to minimise total ROM usage - uses weird 6502 knowledge :)
|
|
|
|
.macro CLEAN_START
|
|
.local CLEAR_STACK
|
|
sei
|
|
cld
|
|
ldx #0
|
|
txa
|
|
tay
|
|
CLEAR_STACK: dex
|
|
txs
|
|
pha
|
|
bne CLEAR_STACK ; SP=$FF, X = A = Y = 0
|
|
.endmacro
|
|
|
|
;-------------------------------------------------------
|
|
; SET_POINTER
|
|
; Original author: Manuel Rotschkar
|
|
;
|
|
; Sets a 2 byte RAM pointer to an absolute address.
|
|
;
|
|
; Usage: SET_POINTER pointer, address
|
|
; Example: SET_POINTER SpritePTR, SpriteData
|
|
;
|
|
; Note: Alters the accumulator, NZ flags
|
|
; IN 1: 2 byte RAM location reserved for pointer
|
|
; IN 2: absolute address
|
|
.macro SET_POINTER ptr, addr
|
|
lda #<addr
|
|
sta ptr
|
|
lda #>addr
|
|
sta ptr+1
|
|
.endmacro
|
|
|
|
|
|
; assume NTSC unless PAL defined
|
|
.ifndef PAL
|
|
PAL = 0
|
|
.endif
|
|
|
|
; 192 visible scanlines for NTSC, 228 for PAL
|
|
.if PAL
|
|
SCANLINES = 228
|
|
LINESD12 = 19
|
|
.else
|
|
SCANLINES = 192
|
|
LINESD12 = 16
|
|
.endif
|
|
|
|
; start of frame -- vsync and set back porch timer
|
|
.macro FRAME_START
|
|
VERTICAL_SYNC
|
|
.if PAL
|
|
TIMER_SETUP 44
|
|
.else
|
|
TIMER_SETUP 36
|
|
.endif
|
|
.endmacro
|
|
|
|
; end of back porch -- start kernel
|
|
.macro KERNEL_START
|
|
TIMER_WAIT
|
|
lda #0
|
|
sta VBLANK
|
|
.if !PAL
|
|
TIMER_SETUP 194
|
|
.endif
|
|
.endmacro
|
|
|
|
; end of kernel -- start front porch timer
|
|
.macro KERNEL_END
|
|
.if !PAL
|
|
TIMER_WAIT
|
|
.endif
|
|
lda #2
|
|
sta VBLANK
|
|
.if PAL
|
|
TIMER_SETUP 36
|
|
.else
|
|
TIMER_SETUP 28
|
|
.endif
|
|
.endmacro
|
|
|
|
; end of frame -- jump to frame start
|
|
.macro FRAME_END
|
|
TIMER_WAIT
|
|
.endmacro
|
|
|
|
;-----------------------------------------------------------
|
|
; SLEEPR - sleep macro that uses JSR/RTS for 12 cycle delays
|
|
; Requires a lone RTS instruction with the label "Return"
|
|
; (note: may fool 8bitworkshop's Anaylze CPU Timing feature)
|
|
|
|
.macro SLEEPR cycles
|
|
.if cycles >= 14 || cycles = 12
|
|
jsr Return
|
|
SLEEPR (cycles-12)
|
|
.else
|
|
SLEEP cycles
|
|
.endif
|
|
.endmacro
|
|
|
|
;-----------------------------------------------------------
|
|
; SLEEPH - sleep macro that uses PHA/PLA for 7 cycle delays
|
|
; (may affect flags)
|
|
|
|
.macro SLEEPH cycles
|
|
.if cycles >= 9 || cycles = 7
|
|
pha
|
|
pla
|
|
SLEEPH (cycles-7)
|
|
.else
|
|
SLEEP cycles
|
|
.endif
|
|
.endmacro
|
|
|
|
;==============================================================================
|
|
; T I A - C O N S T A N T S
|
|
;==============================================================================
|
|
|
|
HMOVE_L7 = $70
|
|
HMOVE_L6 = $60
|
|
HMOVE_L5 = $50
|
|
HMOVE_L4 = $40
|
|
HMOVE_L3 = $30
|
|
HMOVE_L2 = $20
|
|
HMOVE_L1 = $10
|
|
HMOVE_0 = $00
|
|
HMOVE_R1 = $F0
|
|
HMOVE_R2 = $E0
|
|
HMOVE_R3 = $D0
|
|
HMOVE_R4 = $C0
|
|
HMOVE_R5 = $B0
|
|
HMOVE_R6 = $A0
|
|
HMOVE_R7 = $90
|
|
HMOVE_R8 = $80
|
|
|
|
; values for ENAMx and ENABL
|
|
DISABLE_BM = %00
|
|
ENABLE_BM = %10
|
|
|
|
; values for RESMPx
|
|
LOCK_MISSILE = %10
|
|
UNLOCK_MISSILE = %00
|
|
|
|
; values for REFPx:
|
|
NO_REFLECT = %0000
|
|
REFLECT = %1000
|
|
|
|
; values for NUSIZx:
|
|
ONE_COPY = %000
|
|
TWO_COPIES = %001
|
|
TWO_MED_COPIES = %010
|
|
THREE_COPIES = %011
|
|
TWO_WIDE_COPIES = %100
|
|
DOUBLE_SIZE = %101
|
|
THREE_MED_COPIES = %110
|
|
QUAD_SIZE = %111
|
|
MSBL_SIZE1 = %000000
|
|
MSBL_SIZE2 = %010000
|
|
MSBL_SIZE4 = %100000
|
|
MSBL_SIZE8 = %110000
|
|
|
|
; values for CTRLPF:
|
|
PF_PRIORITY = %100
|
|
PF_SCORE = %10
|
|
PF_REFLECT = %01
|
|
PF_NO_REFLECT = %00
|
|
|
|
; values for SWCHB
|
|
P1_DIFF_MASK = %10000000
|
|
P0_DIFF_MASK = %01000000
|
|
BW_MASK = %00001000
|
|
SELECT_MASK = %00000010
|
|
RESET_MASK = %00000001
|
|
|
|
VERTICAL_DELAY = 1
|
|
|
|
; SWCHA joystick bits:
|
|
MOVE_RIGHT = %01111111
|
|
MOVE_LEFT = %10111111
|
|
MOVE_DOWN = %11011111
|
|
MOVE_UP = %11101111
|
|
P0_JOYSTICK_MASK = %11110000
|
|
P1_JOYSTICK_MASK = %00001111
|
|
P0_NO_MOVE = P0_JOYSTICK_MASK
|
|
P1_NO_MOVE = P1_JOYSTICK_MASK
|
|
NO_MOVE = P0_NO_MOVE | P1_NO_MOVE
|
|
P0_HORIZ_MOVE = MOVE_RIGHT & MOVE_LEFT & P0_NO_MOVE
|
|
P0_VERT_MOVE = MOVE_UP & MOVE_DOWN & P0_NO_MOVE
|
|
P1_HORIZ_MOVE = ((MOVE_RIGHT & MOVE_LEFT) >> 4) & P1_NO_MOVE
|
|
P1_VERT_MOVE = ((MOVE_UP & MOVE_DOWN) >> 4) & P1_NO_MOVE
|
|
|
|
; SWCHA paddle bits:
|
|
P0_TRIGGER_PRESSED = %01111111
|
|
P1_TRIGGER_PRESSED = %10111111
|
|
P2_TRIGGER_PRESSED = %11110111
|
|
P3_TRIGGER_PRESSED = %11111011
|
|
|
|
; values for VBLANK:
|
|
DUMP_PORTS = %10000000
|
|
ENABLE_LATCHES = %01000000
|
|
DISABLE_TIA = %00000010
|
|
ENABLE_TIA = %00000000
|
|
|
|
;values for VSYNC:
|
|
START_VERT_SYNC = %10
|
|
STOP_VERT_SYNC = %00
|