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这是个 nesasm 3.2 入土教程, 感兴趣的可以研究下! `, C' |0 L1 S+ D

3 K. a; A: R0 `4 F以下是主框架代码:
3 ?2 X* m' o+ v) ^2 v- ;======================================================================
8 y9 U. d+ B' m: R/ D - ;文件头( Q" e _8 p$ k2 @$ x" ?$ w
- NES_16KB_PRG_SIZE = 8 ;16KB PRG大小数量
% P& U# }9 l1 D! ^) P/ ~6 U - NES_8KB_CHR_SIZE = 1 ;8KB CHR大小数量/ O9 @' E; k) }/ n1 ]
- BANK_DATA_MASK = NES_16KB_PRG_SIZE * 2 - 1 ;bank号掩码, J* j* ]' e7 X y; H
- ;======================================================================
2 y) P9 b* J- C+ l6 A$ g6 p: \( b, q - PRG_DATA_BANK_C000 = NES_16KB_PRG_SIZE * 2 - 26 p# N1 i" b) I2 G, l
- PRG_DATA_BANK_E000 = NES_16KB_PRG_SIZE * 2 - 1
6 q5 @( S8 M. q. L - ;======================================================================
$ n( j2 X S$ n0 i5 m - RESET_BANK = NES_16KB_PRG_SIZE * 2 - 1
2 W" C7 I# z7 ~+ z2 A2 N0 G" r - RESET_ADDR = $E000 ;主程序起始地址& U1 J4 v! Z$ Z) M$ b2 z
- ;======================================================================' r# X W7 V" b, B9 p
- .INESPRG NES_16KB_PRG_SIZE ;16KB PRG 数量, $01-$EF8(1-3832),即16-61,312 KB
5 r$ X. ^4 H% I" o: e - .INESCHR NES_8KB_CHR_SIZE ;8KB CHR 数量,$01-$EF8(1-3832),即0-30,656 KB
& |5 R; m7 D ~" j$ H* W1 t - .INESMAP 4 ;Mapper号 (0-4095)
0 f5 }5 | c" g! U5 v - .INESSUBMAP 0 ;子Mapper号 (0-15): ~% `0 d' Z& J' h
- .INESMIR 0 ;命名表镜像 (0: 水平 1: 垂直 2: 四屏)
/ a/ [- R6 r' U4 o: h' a, O - .INESBAT 0 ;指定是否存在电池备份 (0: 不存在 1: 存在)
: j( x5 R, t0 V+ R' C - .INESPRGRAM 0 ;指定 PRG RAM 大小 (大小 = 64字节 << 计数). B& V/ B5 k7 }6 X7 |/ v( G9 v- M& \
- .INESPRGNVRAM 0 ;指定 PRG NVRAM 大小(大小 = 64字节 << 计数)
; m5 x5 O% r. L! c; N* a: d% ?- g) j - .INESCHRRAM 0 ;指定 CHR RAM 大小(大小 = 64字节 << 计数)9 c# |9 Z1 h" P" b
- .INESCHRNVRAM 0 ;指定 CHR NVRAM 大小(大小 = 64字节 << 计数)+ G$ v+ D1 q' h5 K7 d$ {$ }+ Z
- .INESTIM 0 ;指定时序 (0: NTSC, 1: PAL, 2: 多区域, 3: Dendy), @5 A, e9 w/ T3 E+ P3 P! Y' a v2 R
- ;======================================================================
! N+ c3 b9 O2 s+ R2 m. J& Y - .INCLUDE "fc_demo_config.asm" ;全局配置
; t" g3 ]5 H ] B3 M- ]6 B - .INCLUDE "fc_demo_constant.asm" ;NES常量
! H6 p) g( y, ^ - ;======================================================================
: J' V$ B! _2 ~- W' Y* f8 \" A: A - ;音乐配置- J8 z" S9 C7 r
- .IF 0 = MUSIC_THEME % X( a7 s' P( T! _2 V
- .INCLUDE "data/music/Gremlin 2/config.asm"" }" `+ n* V( h
- .ENDIF2 m# k. ]3 @* y1 y$ e# y$ }) F
- * u1 v j0 \ f/ w
- .IF 1 = MUSIC_THEME
) K) X& \- x" p - .INCLUDE "data/music/Raf World/config.asm"
+ b: C6 _$ @ R! ~. {: `. x - .ENDIF% h( l* t) d' M
- * A- h% ]+ J1 a3 R$ y4 w. p" Q
- .IF 2 = MUSIC_THEME 4 a t# s, i1 s/ R, e& E" }8 b
- .INCLUDE "data/music/Ninja Gaiden 3/config.asm"
& X5 w% H: |& D8 i: d9 E, r/ C - .ENDIF
( F2 v7 P5 X- {) v# `9 [# a9 F, J2 m - ! s: G, M. g0 y' F$ r
- ;======================================================================
2 u- s5 |0 Q2 J+ {, [ - ;引用CHR图像数据- r8 o1 L% z$ Y- `1 x* y
- .BANK NES_16KB_PRG_SIZE * 2
; a& H) I9 D, @$ j+ f% C- F6 w - .ORG $0000+ V2 V3 G: |, G" S& t. G$ H: r
- .INCBIN "data/bkg.chr"9 a' G8 L" o- M# C( U* P3 ~
- .INCBIN "data/sp.chr"6 P: t+ ]" f) \/ M. [4 ~
-
9 q8 U) D9 X, ^ - ;======================================================================
3 Z' d* l- h" t+ M9 F) p3 W. t5 \ - .BANK PRG_DATA_BANK_E000 & BANK_DATA_MASK;设置程序所在Bank
8 I3 A/ _5 y: Q$ V$ X9 C - .ORG RESET_ADDR! Y( F& w& ]; U# j1 d
- ;======================================================================" x# k) R( r" D$ {
- ;引用其他源文件" d) Z/ r G4 L* ?" f6 C
- .INCLUDE "fc_demo_ppu.asm" ;PPU处理 c9 k1 O* p& ~- _% ^! @: r
- .INCLUDE "fc_demo_joysitck.asm" ;手柄处理. E1 A5 z- X9 _% N; m
- .INCLUDE "fc_demo_static_text.asm" ;静态文本处理
! [; C+ i0 W" \) P# E- F" t - ;======================================================================- k- U9 Q; p0 a. g3 M' \9 l
- ; i& Y! ~: h8 _5 f3 S1 w5 g
- ;======================================================================
2 h. c. Z9 P" V7 i Z- ], D: R - ;等待VBlank到来
- O7 U& Q, V$ @% k. I5 `0 J9 ~# J - Wait_For_VBlank7 q) r4 r! u. e* h, D
- LDA PPU_STATUS* n$ m, t& W# b7 ^
- BPL Wait_For_VBlank" c" y' Y$ }5 [0 ~1 Y2 r& \! n- Z
- RTS4 Y: j' X; u$ ]$ N* E* T, B/ ]
/ }- G! m; I N# m- ;======================================================================) p% A9 G7 V+ B) c! ~* ]
- ;调色板初始化( ~0 U' f1 h, A9 h6 Q. L% f- Q
- Palette_Init
4 Y& U# t3 L) w9 c8 @/ I3 V - LDA #$3F' O* L4 b- Y# H/ T) r: t/ T5 f x& ]
- STA PPU_ADDRESS! y0 f9 M' E6 ~ G. V/ ?# f
- LDA #$00! }+ z- L0 j9 O7 W$ W
- STA PPU_ADDRESS
! K! ]. k* c( F0 q6 h* h' Z8 L - LDX #$00
) N: { Y9 Q0 R1 ` - LDY #$20
7 n" g: K* X6 N; s* H( X. J - .Write_Data! ]. ^3 A+ T8 a, j5 C3 n n1 F9 W
- LDA Palette_Data,X
" ~ m5 S; Z% u5 H& Y/ A7 h - STA FC_PPU_Pal_Addr,X! c& Y1 {! ]$ i7 H6 U, t* i
- INX: M- Z6 j4 h) }; k+ l. c5 N: M
- DEY3 a8 h1 F! Y g( U, k
- BNE .Write_Data
( b8 r# f+ J; }% b1 B - .End% e0 B Y& q0 |6 @
- RTS
m! C0 y' [- s) ? - 9 {9 I8 f* Y5 }! ]+ ` _
- ;----------------------------------------
* P5 @2 {" T! [* ^- u, H - ;调色板数据
* n' L7 L& [0 [6 m( `2 n) [ - Palette_Data
/ J$ Y. {$ O9 ^6 ^1 f3 q6 N+ s* { - .HEX 0F 20 32 02 0F 20 32 0F 0F 20 32 26 0F 1B 0F 1B
m( g4 @4 x7 v' v& u- Y - .HEX 0F 21 27 22 0F 24 24 24 0F 21 21 21 0F 22 22 22+ `0 E0 B2 B w; V9 v
-
, I: f: C j) A" _ - ;======================================================================
* S! x$ q$ j A }+ U* Z, E - ;命名表清空; r: k4 U# x( x' g z
- Nametable_Clear% V6 X; m# b# y2 Z" s
- LDA #$20
$ ~) A# Z9 ^1 J$ T1 b' H - STA PPU_ADDRESS
; t/ X6 O% H6 R8 C6 ]9 i7 j - LDA #$00
7 [. l' g7 b( m. }( _1 p - STA PPU_ADDRESS& Z5 U( r) f7 ~/ i8 A q* ?
- LDA #$00- k7 o. Y" C5 Z' h5 q
- LDX #$00
+ V3 z& V& S# m6 R - LDY #$08# c* ?3 ]5 y/ F5 I6 N' i
- .Write_Data5 s: M r8 w; e
- STA PPU_DATA3 O$ c. K! A. b8 Q2 o. }) E
- INX
) C* y# f9 s. c* A - BNE .Write_Data
1 t: c# C: U5 S# \( }3 N - DEY
1 W0 f* |# K6 |6 { l2 T5 N8 B - BNE .Write_Data
/ w, ~! b" E+ z' J8 \7 k( d - .End% d9 ?9 Y8 c+ j6 ^
- RTS$ _' j8 p0 F: v& ~
- ! `5 `, q- j8 J: w
- ;======================================================================
4 w" |1 a1 }% B5 x- o2 l3 c - ;音乐曲目切换
7 z! k1 v, I+ s# P" I6 f F8 N - Music_Select_Process
2 ?8 M9 g7 A( b M8 h7 s+ [6 T
& H5 z$ z( [* ]$ M4 ~( ?) ^. X- .Pre_Music;上一曲
+ W! m9 o/ \4 j" x5 f - LDA FC_Gamepad_Once
2 Y ^0 ?) v6 M9 a3 @( u$ H - CMP #JOY_KEY_LEFT
9 _, N2 c+ Z9 v5 [0 o+ ~- B - BNE .Next_Music
/ T/ j7 S5 `: Q d8 i: M6 x2 q - JSR Music_Play_Pre8 a* Z7 I6 v4 {8 W9 w$ P0 g: x* \
- .Next_Music;下一曲
! u S8 r+ U% W' U - LDA FC_Gamepad_Once
o, J' t4 t: w, s - CMP #JOY_KEY_RIGHT" H( ?8 T% s& b, ~, w' B4 g0 W
- BNE .Next_10_Music2 |3 {* q' ~% I- Z7 _0 J: A
- JSR Music_Play_Next
+ a6 \& ~' U# f! [1 Q" k2 r o - .Next_10_Music;上10曲# N$ x1 G) W+ C; w" K
- LDA FC_Gamepad_Once+ n2 o% U/ F( m! M3 O
- CMP #JOY_KEY_UP
3 B3 f: o% W4 m$ X - BNE .Pre_10_Music
8 k9 o% c d- y: [& ?" W - JSR Music_Play_Next_10
9 J+ } k0 `1 ~; { _ - .Pre_10_Music;下10曲4 V x) b% n) p# f+ x
- LDA FC_Gamepad_Once
: n: Q; C. [. n1 M3 G' U' ? - CMP #JOY_KEY_DOWN7 q% Z/ h0 N D$ ?5 P7 T
- BNE .Reset
5 z+ A7 F. r5 y, s' X - JSR Music_Play_Pre_10
2 A, {/ _/ d% P' `: m; { - .Reset;重播当前曲目
- C, | \0 b. g2 S R" p - LDA FC_Gamepad_Once# T6 w4 p! b6 f* \: ^( t* E1 F* @' a
- CMP #JOY_KEY_START% ^& Z( T& d! B Q# b- U) Y2 |
- BNE .End
6 F$ r1 l6 ^7 ~) ~! c- ~: B& ~* W9 N - LDA FC_Music_Index* ?* ]" @7 S8 Y* T
- JSR Music_Init_Process" U. N* T% @' [' u- V2 K7 U
- .End
/ ~3 p1 T& l; a) }# L - RTS# X7 [ S7 ]- \+ a Y: @# u
- R' s( M1 z1 N$ a2 {- ;----------------------------------------------------------------------6 H& z4 Q5 c. }0 W+ v% k0 s; y
- ;播放上一曲
" A U) t3 v* O" y+ U8 ?+ i6 ~( w - Music_Play_Pre
+ _9 p+ X, M8 x% O, b - LDA FC_Music_Index
: f9 Q' F; l/ Q2 `* K% b; S- A - BEQ .End, s6 ^/ ^7 F. }9 O. m3 r
- DEC FC_Music_Index
5 M* N4 r4 [0 n2 o! e - LDA FC_Music_Index; ]/ O" l6 h/ f" E ?9 O; r
- JSR Music_Init_Process3 c- w# C! K/ E+ O1 G6 U* M
- .End
" m! p; [2 e% f, L% s3 l" O- H - RTS
6 v8 }, S% b* t2 W9 _ b- X( Q" o - ;----------------------------------------------------------------------
. p. c3 q* F* l- {1 \8 V. z+ Y - ;播放下一曲
: P3 w+ m% ]* \& z - Music_Play_Next
. B5 R, t! z4 Z* R - LDA FC_Music_Index. Q; B$ X2 g* z6 ]
- CMP FC_Music_Max_Index
1 c# k7 V1 V( @) i3 n - BCS .End
8 U; y+ b$ g8 E- l; g7 n# H) R - INC FC_Music_Index0 o, a2 X/ ?# S0 w# {
- LDA FC_Music_Index$ N7 Z" c3 ` o
- JSR Music_Init_Process
5 X _6 T0 _% h6 }! o( J( v8 W z - .End3 c7 B% B6 A0 D' M$ X" j. u/ G3 W
- RTS+ e& e: q: G4 J/ l n4 Y+ m" ^
3 n. v/ j6 a3 x5 J# N: E9 f- g. S- ;----------------------------------------------------------------------
' I% M8 U" b2 | - ;播放上10曲
/ ?2 W! S+ C) M: x; Z+ O8 s - Music_Play_Pre_10& n2 Z( R% H& D+ j; b, Q3 F
- LDA FC_Music_Index% V9 L# R5 B, t8 C3 a
- BEQ .End
$ ]% T1 s1 P; o8 u2 S - SEC
2 L+ i2 Q) u8 C# f4 l - SBC #10
, q: @7 @5 U4 y; C* k - BCS .Pre_103 o/ i8 d+ r6 `
- LDA #$00
_/ c& T5 O8 Q r" L g B* u) [" D - .Pre_10
: n* X0 ^; x# O: f) | - STA FC_Music_Index
/ v; ~0 t. E: N& l1 D( s - JSR Music_Init_Process* ~+ j( d5 H" O, t
- .End3 R7 k. c: k# X6 n0 ]
- RTS
4 b2 y3 ?8 n% `/ u - ;----------------------------------------------------------------------: L% P$ c# N: U2 u. C
- ;播放下10曲0 d0 b. j( z# p: H h7 ~3 p
- Music_Play_Next_10$ a `: I3 E# P1 I3 F3 _
- LDA FC_Music_Index
: @1 ~1 }( i/ r! y" t) t - CMP FC_Music_Max_Index4 X5 o) x# S. D5 g
- BCS .End. r0 ^6 Z2 K& o1 m6 e1 V) P, G
- CLC8 w5 o' l. V. q4 ^3 L( w; `
- ADC #10
% J3 F$ b/ z( N3 i6 n& n - CMP FC_Music_Max_Index% z% \" r/ ]) ]" v
- BCC .Next_10# m y% Y# @$ _
- LDA FC_Music_Max_Index
7 X- A% }; _; L6 B4 G. S( C: c/ S - .Next_106 S# \! v3 B( m1 d
- STA FC_Music_Index/ _* x7 A( H5 p2 P
- JSR Music_Init_Process6 z. p! x* U, L, o5 \
- .End
1 |7 J; y0 @$ C% z8 o* h - RTS3 C7 C2 H% R" A6 v
- - Q; A: N3 h9 M% E8 C
- ;----------------------------------------------------------------------( P; f5 s. G) l
- ;8位十六进制转3位十进制制* w2 }* E6 M1 }
- Hex8ToDec6 Z- Z: j3 C- p% @0 g: [" X- h
- STA FC_Dec_Data_1
( q% v+ S, g4 Q' U, g - LDA #$00' z# T U: \0 z$ w0 s8 s) c
- STA FC_Dec_Data_100
! j7 K* V! d" h; g, m3 L% E% Y9 x - STA FC_Dec_Data_109 K% |+ h$ ~- B
- LDA FC_Dec_Data_1
7 `" g9 z4 [9 G# w - .Convert_100
* }% a% @/ A5 j - CMP #100, f7 ^; s% j: x! `, r7 n
- BCC .Convert_10
$ b* f& W+ p% F/ _! a' g; c - SEC
* x+ T" A' `# p5 T5 X% Y - SBC #100. B9 P3 D7 N! C
- INC FC_Dec_Data_100* G" a: }' |' F7 g! C* A
- BNE .Convert_100
' X8 w- o/ ~9 i, c - .Convert_10
4 }1 N# x: G; s/ R S+ u3 W8 k0 A$ K5 E - CMP #10
4 o/ }( Y/ O- z! ] d9 G - BCC .End9 \- \8 v. Z; ?/ P( v
- SEC
3 B3 q+ Y' U- t/ @: d$ [* a- s% D - SBC #10
% {7 O3 ?/ N$ Q$ B( k - INC FC_Dec_Data_10! a2 X/ B+ e- E s' f1 _
- BNE .Convert_10
9 {8 O9 I. W+ \% k% ~ - .End8 ]% _, S ^# S- L- d! M
- STA FC_Dec_Data_1$ L0 f' @2 }+ e! x" c2 f& Z1 F
- RTS
1 s }( ?. x8 M; n: s1 f" P4 d2 u/ W
" o9 F5 m: Y8 k3 {0 d4 G4 u- ;----------------------------------------------------------------------
3 w. e$ O! f. k# Z+ U! Z - ;显示曲目信息
) E7 P Z) c0 @- s - Music_Info_Display7 W9 P9 D$ p U
- LDX FC_PPU_Buf_Count
" B, Q+ \, |. T# ?+ S# p) x! z - LDA #PPU_WRITE_MODE_CNT_LINE" n1 w: w$ K9 V
- STA Use_PPU_Buffer,X e3 K9 Y5 d9 i" v- ^, I" C
- INX
9 k6 a& Z! R) c1 X4 ]( z) F -
: h/ M1 D) _' Y, T: }) n# Y - LDA #>MUSIC_INFO_POS/ @- ^- a% @" i I. `
- STA Use_PPU_Buffer,X
; T* z7 j# [3 X+ e- r, V8 r' R3 w - INX9 Y K% S: Q; W- h! F6 [
-
* z' f, m2 ]8 U, x+ W" Y' m" X - ;居中3 `+ |6 P6 |% i0 r% ?! }! n4 i
- LDA #<(MUSIC_INFO_POS & $E0) + (32 - 5)/2
: j1 L9 K% X* @5 ]3 ? - STA Use_PPU_Buffer,X( t8 M, t' x. f% s G* a5 ~; z1 G
- INX5 X9 E3 z3 \) A* u7 ] r& {0 P% f
- $ X# W3 {5 q. n5 U
- LDA #$05
/ l& J/ P* H5 B6 K) q' o9 b' q - STA Use_PPU_Buffer,X
: T! c/ f# y; `$ [ - INX
2 I1 K7 u; H5 A2 }' R: M; t -
; R: o- e6 N& ^- x% A - LDA FC_Music_Index
: q' p( c) j7 V" Z% d* n - CLC) t4 |: i) Z4 R1 h: b5 B
- ADC #$01 \) a8 H1 ?. g9 R O' `6 I
- JSR Hex8ToDec. P d/ ^8 }' u
- & m7 y/ p0 s8 t* K7 C
- LDA FC_Dec_Data_10
+ F6 Q" J) @* {0 |* u% K - CLC
5 W, H* j+ E4 `0 @ - ADC #'0', G- o0 n. H. F; O! f2 r& ~
- STA Use_PPU_Buffer,X0 d, U$ i) |* H' T2 _2 T" |
- INX
3 v( s7 t/ e) }( l4 X1 o - 3 B% }4 t5 h/ \; _1 S; D$ _8 T
- LDA FC_Dec_Data_1
9 c( `+ U" Z7 Y% N+ r; `4 z5 v - CLC
" Z& }4 v; B: F% m2 O - ADC #'0'
4 P& U, y- a! c) a0 m3 ~ - STA Use_PPU_Buffer,X6 A& W5 o! K# o! ]
- INX- U: ]9 T, m; P, N/ ?
-
: y6 x7 r5 v5 i9 O+ d; z( _ b - LDA #'/'
( d6 F* A; B- x8 f4 F - STA Use_PPU_Buffer,X
* R5 O, A) n2 B: W* R - INX
" y& B1 z( g% L0 o2 ` -
# l* E, [! s6 e0 i4 H - LDA FC_Music_Max_Index' U- G. W3 b4 @4 Q* w( R. n6 h: w7 s
- CLC* o7 I2 t- K# f: W8 o. w; ?
- ADC #$01
- Y/ G( M) @" G3 Q - JSR Hex8ToDec
2 f/ ? J" R( P) c# v - # p' U) ]4 U. U6 H I: N
- LDA FC_Dec_Data_10
" o! m. A7 I( ~6 Y - CLC
2 S. e! `* o. |2 G- c2 K - ADC #'0'" R& @9 Q- n* ^ ?2 ]% i
- STA Use_PPU_Buffer,X
. ~; O6 H+ r) F7 a - INX4 {. u7 r+ a, c2 o7 z
- " E4 c, l! \- z8 [5 U$ Z
- LDA FC_Dec_Data_1
& o7 k* V& [6 L; \0 x - CLC1 z% l C- R9 V/ e* Z
- ADC #'0'& d0 Y, P6 T1 O* r' @! {
- STA Use_PPU_Buffer,X
1 g l0 A2 N5 P% \" d0 D - INX$ ~& o. G$ a/ V, R, U
- 4 s# C+ t; v& `
- .End
7 m# n6 I! M0 M3 Z6 d8 s# Q |6 U - STX FC_PPU_Buf_Count' z0 y4 r8 ~! G7 X
- RTS/ q' B3 e& E3 N3 `, l+ [1 h3 T8 R
- ; H8 m+ B" M" |# L+ [# A, k/ J
- ;----------------------------------------------------------------------4 a( w- x3 ?" @
- ;音乐曲目初始化处理# F) I3 P8 g5 u2 h6 W
- Music_Init_Process
' _( s3 j5 z2 x1 b - PHA
. C7 _' J0 \3 v+ J - JSR Music_Clear_Process2 {# s" F8 ? Z
- LDA #$1F2 I8 }# {' n; Z* r" h
- STA $40153 m1 O' A( E5 R
- PLA; G7 V& x6 P# Z- Y
- JSR Music_Init_Addr' h! N6 X3 B/ J5 G4 B2 V; k4 Y
- JSR Music_Info_Display0 Y5 q8 ]) x; |; j
- RTS
8 B4 c C, l5 p. [* B! n0 j2 t - ' b# ~+ @8 G" ^ Z6 D9 o
- ;----------------------------------------------------------------------# M ^- F/ s# W& x7 z: e( ]# _
- ;音乐播放处理) H0 w' C. t5 e8 d
- Music_Play_Process
) a3 W" i9 a8 i4 b) r$ ~$ ` - JSR Music_Play_Addr: V0 R. h; F: X& F: L3 K- n4 w
- RTS/ K0 v2 t* @: {" c! l0 |
- * q) P( c$ T9 S; j
- ;----------------------------------------------------------------------' b5 a2 o) s9 A! j e) M. U) K7 ~8 O
- ;音乐播放处理
5 ~- u" b# @1 Q% } - Music_Clear_Process( h! H. O' u5 [: H/ w& I) \
- .IF Music_Clear_Addr/ z% r, C6 \8 i9 D
- JSR Music_Clear_Addr
9 G- i8 d8 ]2 ~4 m - RTS4 L- R) f, ~# m) c
- .ELSE
9 X* N! N) \8 f8 b: c - LDA #$1F
1 t9 _- E f) D* {* U" m8 N& v - STA $4015
8 q' x% B0 M8 W8 X9 n6 A - LDA #$005 \) x$ _1 C4 ~4 g& A
- STA $4010% c# `6 Q+ J2 D3 a. b
- LDX #$00
0 F3 \. \5 t& F' G - LDA #$00' u( {( [! r! Y1 `& F( F- b4 k
-
. W/ P! Y) _9 D9 R+ `9 l - .Music_Clear_Zreo_Page_0
; J6 A! ?+ p* G: f. d - STA $00,X1 Q! O: B0 Q/ R
- INX
! ~5 h& s8 t8 J( W" p0 v* D0 K - CPX #Use_Zero_Page_Begin
) {+ V% I& {$ x5 G9 F1 r - BCC .Music_Clear_Zreo_Page_02 K. B2 @5 g ?+ b9 K
- $ @6 j# Z7 I" v/ J* V/ E" s
- LDX #Use_Zero_Page_Begin + Use_Zero_Page_Size
4 U+ [* C3 d* q! B2 d+ H - .Music_Clear_Zreo_Page_1, {3 ^3 b2 F7 R
- STA $00,X
3 v/ c% |; S o- z2 k! @* v2 H - INX
! s( h# E' ]' t0 z$ Z1 j9 H - BNE .Music_Clear_Zreo_Page_1; V( C6 Q, N% r4 s
- 8 B0 H; m# r. q& W Z( l$ _7 ~
- Music_Clear_Process_1
, s. _/ z ]3 Z) j2 E% D3 F$ K' R - STA $0600,X8 [( g& a; h% H7 m( @
- STA $0700,X. U( \. s" {# X* g) z; B9 X& G
- INX9 ^3 _3 n0 y: J% D; j" {
- BNE Music_Clear_Process_1( D6 {6 j7 h4 v8 ~8 G
- LDA #$10! N5 w" p, B" K
- STA $4000* S% B1 Y! e. z) y' P0 I
- STA $4004
( G# n8 T H( e2 \% @8 q ]2 t m$ D - STA $400C
; ]4 u- E6 F3 f" I7 b, |2 z2 ~ - LDA #$008 ^. L. A# z; V1 [: H( G
- STA $4008
; g7 _$ Z) f1 I4 N - LDA #$0F& d* ^6 l6 _. `
- STA $4015: L% u ]* G: _" {$ Y3 x
- .ENDIF
6 M$ I& x/ q8 D5 ] - ! v2 z) x3 T' w8 g2 X
- RTS: p2 F# H! T1 A
1 {. j7 ^/ `3 ^2 E' ~4 \- ;======================================================================
! {: O7 h7 a4 |4 a% n- `: Q3 @ - ;重启处理
8 m7 o6 r( f7 A - Reset_Program
' N0 P; K) g' O4 |5 U - SEI
. \/ @- u: C: U6 f/ j - CLD
4 g) o" s" x% K. V/ W - LDA #$00& _. }7 g" c6 N, _# c) }
- STA PPU_CTRL2 ^4 @- X5 G l- Z$ [8 x& P# {$ B& h5 g
- STA PPU_MASK: F+ z2 O/ j! n0 B! S2 [: Q+ c- |
- STA JOY2_FRAME
. t; T, w- S. J1 @ - STA APU_STATUS
$ ^3 d, J% b! L- w" e - # J; J3 i' Y" V0 v- M2 n
- ;等待屏幕准备完毕
# X1 U! g& U" A$ O - LDX #$021 S |- C! Y3 e* P
- .Wait_For_Screen_Ready
/ o9 s5 I3 E! {& k& O4 ~ - LDA PPU_STATUS
B1 x+ K% ~* J - BPL .Wait_For_Screen_Ready
: V/ a4 l! B- w) n - DEX4 M3 Y1 ?; R# v& b) r
- BNE .Wait_For_Screen_Ready X. F5 h% i. c2 Y1 F! F: z
- 5 G& S1 h% S+ p
- ;清空调色板" E- z$ M5 r) y% ?
- Palette_Clear
2 E9 _; f6 I# n+ T# p0 X# t - LDA #$3F# Q- h9 M5 W: p9 l1 o9 ~9 @
- STA PPU_ADDRESS0 H5 d' G$ s2 v7 F7 Z
- LDA #$002 R. O3 R7 ^7 G# @ o, Q: ?* L
- STA PPU_ADDRESS
0 h; j5 r( ` i* G# E+ l( g& V0 D - LDX #$20) M& I& B! n$ o+ u0 K, K* M; T3 l
- LDA #$0F( ^7 |! ?( y! q, g
- .Write_Data8 g$ @1 E9 j$ w* ~# b( h
- STA PPU_DATA! }0 M+ _9 E1 s$ [6 Z0 \) ^& T, O
- DEX
( y; a, {' e% c1 x5 E. ]+ | - BNE .Write_Data' N# G1 j" C% d% ?
- # }2 ^0 ?: i6 a, Y9 ~# ^
- ;清除声音 $4000-4013
& G2 @" e C0 m6 O - LDY #$14
5 G9 Z0 u4 r ~* R, D+ T7 H - LDX #$00
0 B W, e* O5 I% r2 A - .Sound_Clear m, _6 \" g5 i+ h- \
- STA $4000,X' P" T( ~3 \: J/ H' w
- INX
9 P6 `/ k2 G% d0 z - DEY
+ @/ P2 M( Y A0 u, }5 z' E/ E - BNE .Sound_Clear# y `% E- s+ N# q6 u2 u& T
- 4 W: ~' B! ^/ k
- ;清除 RAM $0000-07FF+ f" V- |5 O! w- W; r0 d
- LDA #$00
4 f2 c5 Z% C5 K- t* ? - STA $00
$ E# K/ w( I9 h2 z7 N& f9 c/ K6 q - STA $01
" U1 c2 B$ s0 d3 v5 P& a - TAY
. ]! \7 [8 R- i0 T) z - LDX #$087 v/ ^" L" W' h& A
- .Memory_Clear
' p# ?& F2 \1 {6 u, r" o- R. i - STA [$00],Y
6 u# m* j/ S. n7 z( D- w - INY" E0 R1 Z8 ~3 f8 B2 h
- BNE .Memory_Clear
1 U3 |7 I2 H6 S+ ?3 X1 r3 _ - INC $01
5 f* m" Q$ f" V2 q* E* S0 x - DEX
( R0 Y3 m; G- S- y - BNE .Memory_Clear
% ?& G# @% v! V/ Q0 R7 U' | -
5 o# O: K$ G5 J& N+ p - ;精灵缓冲初始化+ b# z9 K8 b9 j. l( f" D0 \
- LDX #$00
A" R& r/ z t @# J$ ]3 h - LDA #$F8
. F& v, ^1 G8 t - .OAM_Clear
4 o( A( X, F) I: V0 ? - STA OAM_DMA_Buffer,X
7 |8 p: q, F; W8 H6 r - INX
" q& r5 e6 ]0 q7 R, D. |: I# C) e - BNE .OAM_Clear; D @9 G% y: K3 O! Y: @6 _0 X
- - i% P* X, t) M7 ?; ]) p0 M* c6 P
- ;栈指针初始化7 T- C4 q# b- I: O; E
- LDX #$FF2 X' p) F# b- g t
- TXS
/ v! p) V# W8 q( x( p- q - & c7 x# c9 v% x- ]# U" a5 A, c& [
- JSR Nametable_Clear;命名表清空, A0 n% Z# r& @7 X, ?/ F
- JSR Palette_Init;初始化调色板缓冲2 u" p8 {! c( u2 _
- JSR Static_Text_Init;初始化静态文本) C- w1 T T6 Z1 C) e1 E
- 2 k5 {+ |* g# ` Y
- LDA #MUSIC_ITEM_TOTAL - 1
3 N, a# u5 Q% y T - STA FC_Music_Max_Index* O. ^, q% Z$ r+ r
- 0 Y t0 D9 X' ]+ T- u' Q
- LDA #$1F
4 C4 Q1 c9 b& I6 @2 P - STA APU_STATUS
9 ~0 L2 W* O' [* H4 C# T9 b) e: y - LDA #MUSIC_BGM - 1, B2 U4 k' q" C9 {7 w ]1 {, Z8 w
- STA FC_Music_Index! Q& I+ u4 N K! w7 G! h, p& N
- JSR Music_Init_Process;音乐播放
) M5 s- d, I/ t1 D" H- H( I - 7 G/ E% u% ~' a8 @, H' y' z, s
- ;设置屏幕显示状态缓冲(当NMI处理时控制屏幕显示状态)& Q9 y0 n4 m% z0 X* [0 [& H
- LDA #$1E
) X9 d5 J' w+ h$ | - STA FC_PPU_Mask_Buf
- z( x6 `9 p- { - , m7 P$ Y- s1 S% {9 u8 K; D. Z
- ;启用NMI处理
$ K7 |, Q4 `7 S$ k* r - LDA #$80
* |* Q G% Z1 M0 [/ `8 j - STA PPU_CTRL, ~4 s" O/ G f# X' h/ e
- * x8 }/ o8 ?, M. X8 y5 }( d* U
- ;程序循环, 剩余工作交给 NMI 中断处理0 J" x6 d1 z' U$ X/ S0 f X
- .Loop0 w/ a @" b# q! [7 `3 w- Z$ m' K
- JMP .Loop* \4 B8 L d) ^8 ~6 `
- " v+ \+ z+ \8 v H! e/ ^( P
- ;======================================================================& N" J6 k1 o9 I5 ` w Y4 A
- ;不可屏蔽中断处理1 h8 C1 W2 f5 a& e6 j3 S0 j
- Nmi_Program# x( n* X" d8 }# `& j' K: g
- PHA* o8 y) H+ ?' J
- TXA6 y0 z o n5 a% ~; i1 z8 v0 |
- PHA* l6 `- F# k8 F( l
- TYA. ~" R* H* ~6 A! ]5 `. E A8 P
- PHA
1 d/ X" y" A( q0 o -
/ D) x6 P- Y9 y3 M- d3 _1 q: x8 z - LDA PPU_STATUS;读取使得 PPU状态寄存器复位
9 A; O" h% g& ?' }$ Z G6 A -
9 k! Z3 E! O3 m1 f. b# W" [ - JSR FC_PPU_Procrss;PPU处理
! U' _# ^: T( r; f: w8 v -
' A- A1 t' Y4 l9 m$ m4 A* `+ [ - ;精灵内存更新
) Y9 W2 B) S9 N" k2 E - LDA #$00
+ A0 Q+ N& f7 v4 L$ \( T - STA PPU_OAM_ADDR$ J& a+ F) O7 a \, u2 J8 H6 b V
- LDA #OAM_DMA_Buffer / $01001 h) ]" d$ H2 n" D+ |$ m1 Z
- STA OAM_DMA3 a( X: h. p6 K8 _1 e6 a
- 0 E$ q6 |: s2 p/ u
- JSR FC_Gamepad_Process;手柄输入处理
^; A8 B) Q- q- x - JSR Music_Select_Process;音乐选曲处理6 m1 h v+ H4 I; q2 }* C5 N0 M
- JSR Music_Play_Process;音乐播放处理
" o6 W( }+ g6 u _! o/ i$ ?* U; m3 O! q: u - 3 s; z% }3 ~. I" D; K
- PLA
' N0 k" n+ P5 W3 J0 b3 ~# g1 P: x9 F' Y - TAY
% I* M9 I9 t$ L" c i. x$ o. x - PLA
% f; K7 E9 o b# W, N - TAX
+ m5 x0 o$ j$ a( b7 w - PLA
6 R% d3 |* \* p/ H! E( }! c
- g8 r/ s1 `4 c, O- RTI- C; l$ N D. a% i$ P: ]3 S
- . {+ m# e* G: Y& W4 c7 [6 Z# p8 d
- ;======================================================================& [- [/ {; y+ H/ l
- ;请求中断处理
$ r; G, H4 C6 ^ - Irq_Program
) r- }9 v* i f# ~+ x* W - RTI
/ o6 z* I) u5 c5 ~2 W+ ^' _2 _: M- P
. {5 |+ X0 U/ y3 g1 Q5 K. W! B" ~- s- ;======================================================================. Q$ ~, B, Y" s* ^2 @/ c9 }/ j0 W
- ;中断向量表7 J9 k" B! j$ `( k6 k/ U
- .ORG $FFFA
' L( j; \% Q3 z( Y M - .DW Nmi_Program ;NMI触发时执行
1 S0 @1 i9 J# g3 Z% U% ?* I: V! F - .DW Reset_Program ;载入ROM时最先执行3 w, e8 C/ g4 A* f+ R3 v+ g! p0 ~! z! k" ~- K
- .DW Irq_Program ;IRQ触发时执行
, }$ ]" C; z: s3 P) L
复制代码 5 a/ N3 `& K& S: Y
& }2 R: g' `; i; f3 n# V* J# @+ \% E" b! @. ^2 B" I
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