| | 1 | SECTION "a",HOME[$00] |
| | 2 | |
| | 3 | LD SP,$fffe ; $0000 Setup Stack |
| | 4 | |
| | 5 | XOR A ; $0003 Zero the memory from $8000-$9FFF (VRAM) |
| | 6 | LD HL,$9fff ; $0004 |
| | 7 | Addr_0007: |
| | 8 | LD [HLD],A ; $0007 |
| | 9 | BIT 7,H ; $0008 |
| | 10 | JR NZ, Addr_0007 ; $000a |
| | 11 | |
| | 12 | LD HL,$ff26 ; $000c Setup Audio |
| | 13 | LD C,$11 ; $000f |
| | 14 | LD A,$80 ; $0011 |
| | 15 | LD [HLD],A ; $0013 |
| | 16 | LD [C],A ; $0014 |
| | 17 | INC C ; $0015 |
| | 18 | LD A,$f3 ; $0016 |
| | 19 | LD [C],A ; $0018 |
| | 20 | LD [HLD],A ; $0019 |
| | 21 | LD A,$77 ; $001a |
| | 22 | LD [HLD],A ; $001c |
| | 23 | |
| | 24 | LD A,$fc ; $001d Setup BG palette |
| | 25 | LD [$FF47],A ; $001f |
| | 26 | |
| | 27 | LD DE,$0104 ; $0021 Convert and load logo data from cart into Video RAM |
| | 28 | LD HL,$8010 ; $0024 |
| | 29 | Addr_0027: |
| | 30 | LD A,[DE] ; $0027 |
| | 31 | CALL a95 ; $0028 |
| | 32 | CALL a96 ; $002b |
| | 33 | INC DE ; $002e |
| | 34 | LD A,E ; $002f |
| | 35 | CP $34 ; $0030 |
| | 36 | JR NZ, Addr_0027 ; $0032 |
| | 37 | |
| | 38 | LD DE,Addr_00D8 ; $0034 Load 8 additional bytes into Video RAM |
| | 39 | LD B,$08 ; $0037 |
| | 40 | Addr_0039: |
| | 41 | LD A,[DE] ; $0039 |
| | 42 | INC DE ; $003a |
| | 43 | LD [HLI],A ; $003b |
| | 44 | INC HL ; $003c |
| | 45 | DEC B ; $003d |
| | 46 | JR NZ, Addr_0039 ; $003e |
| | 47 | |
| | 48 | LD A,$19 ; $0040 Setup background tilemap |
| | 49 | LD [$9910],A ; $0042 |
| | 50 | LD HL,$992f ; $0045 |
| | 51 | Addr_0048: |
| | 52 | LD C,$0c ; $0048 |
| | 53 | Addr_004A: |
| | 54 | DEC A ; $004a |
| | 55 | JR Z, Addr_0055 ; $004b |
| | 56 | LD [HLD],A ; $004d |
| | 57 | DEC C ; $004e |
| | 58 | JR NZ, Addr_004A ; $004f |
| | 59 | LD L,$0f ; $0051 |
| | 60 | JR Addr_0048 ; $0053 |
| | 61 | |
| | 62 | ; === Scroll logo on screen, and play logo sound=== |
| | 63 | |
| | 64 | Addr_0055: |
| | 65 | LD H,A ; $0055 Initialize scroll count, H=0 |
| | 66 | LD A,$64 ; $0056 |
| | 67 | LD D,A ; $0058 set loop count, D=$64 |
| | 68 | LD [$FF42],A ; $0059 Set vertical scroll register |
| | 69 | LD A,$91 ; $005b |
| | 70 | LD [$FF40],A ; $005d Turn on LCD, showing Background |
| | 71 | INC B ; $005f Set B=1 |
| | 72 | Addr_0060: |
| | 73 | LD E,$02 ; $0060 |
| | 74 | Addr_0062: |
| | 75 | LD C,$0c ; $0062 |
| | 76 | Addr_0064: |
| | 77 | LD A,[$FF44] ; $0064 wait for screen frame |
| | 78 | CP $90 ; $0066 |
| | 79 | JR NZ, Addr_0064 ; $0068 |
| | 80 | DEC C ; $006a |
| | 81 | JR NZ, Addr_0064 ; $006b |
| | 82 | DEC E ; $006d |
| | 83 | JR NZ, Addr_0062 ; $006e |
| | 84 | |
| | 85 | LD C,$13 ; $0070 |
| | 86 | INC H ; $0072 increment scroll count |
| | 87 | LD A,H ; $0073 |
| | 88 | LD E,$83 ; $0074 |
| | 89 | CP $62 ; $0076 $62 counts in, play sound #1 |
| | 90 | JR Z, Addr_0080 ; $0078 |
| | 91 | LD E,$c1 ; $007a |
| | 92 | CP $64 ; $007c |
| | 93 | JR NZ, Addr_0086 ; $007e $64 counts in, play sound #2 |
| | 94 | Addr_0080: |
| | 95 | LD A,E ; $0080 play sound |
| | 96 | LD [C],A ; $0081 |
| | 97 | INC C ; $0082 |
| | 98 | LD A,$87 ; $0083 |
| | 99 | LD [C],A ; $0085 |
| | 100 | Addr_0086: |
| | 101 | LD A,[$FF42] ; $0086 |
| | 102 | SUB B ; $0088 |
| | 103 | LD [$FF42],A ; $0089 scroll logo up if B=1 |
| | 104 | DEC D ; $008b |
| | 105 | JR NZ, Addr_0060 ; $008c |
| | 106 | |
| | 107 | DEC B ; $008e set B=0 first time |
| | 108 | JR NZ, Addr_00E0 ; $008f ... next time, cause jump to "Nintendo Logo check" |
| | 109 | |
| | 110 | LD D,$20 ; $0091 use scrolling loop to pause |
| | 111 | JR Addr_0060 ; $0093 |
| | 112 | |
| | 113 | ; ==== Graphic routine ==== |
| | 114 | |
| | 115 | a95: LD C,A ; $0095 "Double up" all the bits of the graphics data |
| | 116 | a96: LD B,$04 ; $0096 and store in Video RAM |
| | 117 | Addr_0098: |
| | 118 | PUSH BC ; $0098 |
| | 119 | RL C ; $0099 |
| | 120 | RLA ; $009b |
| | 121 | POP BC ; $009c |
| | 122 | RL C ; $009d |
| | 123 | RLA ; $009f |
| | 124 | DEC B ; $00a0 |
| | 125 | JR NZ, Addr_0098 ; $00a1 |
| | 126 | LD [HLI],A ; $00a3 |
| | 127 | INC HL ; $00a4 |
| | 128 | LD [HLI],A ; $00a5 |
| | 129 | INC HL ; $00a6 |
| | 130 | RET ; $00a7 |
| | 131 | |
| | 132 | NintendoLogo: |
| | 133 | ;Nintendo Logo |
| | 134 | DB $CE,$ED,$66,$66,$CC,$0D,$00,$0B,$03,$73,$00,$83,$00,$0C,$00,$0D |
| | 135 | DB $00,$08,$11,$1F,$88,$89,$00,$0E,$DC,$CC,$6E,$E6,$DD,$DD,$D9,$99 |
| | 136 | DB $BB,$BB,$67,$63,$6E,$0E,$EC,$CC,$DD,$DC,$99,$9F,$BB,$B9,$33,$3E |
| | 137 | |
| | 138 | Addr_00D8: |
| | 139 | ;More video data |
| | 140 | DB $3C,$42,$B9,$A5,$B9,$A5,$42,$3C |
| | 141 | |
| | 142 | ; ===== Nintendo logo comparison routine ===== |
| | 143 | |
| | 144 | Addr_00E0: |
| | 145 | LD HL,$0104 ; $00e0 ; point HL to Nintendo logo in cart |
| | 146 | LD DE,NintendoLogo ; $00e3 ; point DE to Nintendo logo in DMG rom |
| | 147 | |
| | 148 | Addr_00E6: |
| | 149 | LD A,[DE] ; $00e6 |
| | 150 | INC DE ; $00e7 |
| | 151 | CP [HL] ; $00e8 ;compare logo data in cart to DMG rom |
| | 152 | .fuq JR NZ,.fuq ; $00e9 ;if not a match, lock up here |
| | 153 | INC HL ; $00eb |
| | 154 | LD A,L ; $00ec |
| | 155 | CP $34 ; $00ed ;do this for $30 bytes |
| | 156 | JR NZ, Addr_00E6 ; $00ef |
| | 157 | |
| | 158 | LD B,$19 ; $00f1 |
| | 159 | LD A,B ; $00f3 |
| | 160 | Addr_00F4: |
| | 161 | ADD [HL] ; $00f4 |
| | 162 | INC HL ; $00f5 |
| | 163 | DEC B ; $00f6 |
| | 164 | JR NZ, Addr_00F4 ; $00f7 |
| | 165 | ADD [HL] ; $00f9 |
| | 166 | .fuq: JR NZ,.fuq ; $00fa ; if $19 + bytes from $0134-$014D don't add to $00 |
| | 167 | ; ... lock up |
| | 168 | |
| | 169 | LD A,$01 ; $00fc |
| | 170 | LD [$FF50],A ; $00fe ;turn off DMG rom |
| | 171 | |
| | 172 | |
| | 173 | SECTION "b",HOME[$100] |
| | 174 | boot: jr .running ; $0100 |
| | 175 | nop ; $0102 |
| | 176 | nop ; $0103 |
| | 177 | ;Nintendo Logo ; $0104 |
| | 178 | DB $CE,$ED,$66,$66,$CC,$0D,$00,$0B,$03,$73,$00,$83,$00,$0C,$00,$0D |
| | 179 | DB $00,$08,$11,$1F,$88,$89,$00,$0E,$DC,$CC,$6E,$E6,$DD,$DD,$D9,$99 |
| | 180 | DB $BB,$BB,$67,$63,$6E,$0E,$EC,$CC,$DD,$DC,$99,$9F,$BB,$B9,$33,$3E |
| | 181 | ;$0134 |
| | 182 | DB $00,$E7,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00 |
| | 183 | ;$0144 |
| | 184 | DB $00,$00,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00 |
| | 185 | .running: |
| | 186 | ld a, $FF |
| | 187 | ld [$FF51], A |
| | 188 | .diq: jr .diq |
git.joshuawise.com / fpgaboy.git / blame_incremental