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Merged
testyourmine merged 3 commits into from
Jan 29, 2026
Merged

Document part2 #133

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627e6cf
Name APU registers in part2
testyourmine Jan 21, 2026
270571c
A lot of part2 documentation
testyourmine Jan 28, 2026
e1a0b6e
Merge branch 'main' into nestroid-9
testyourmine Jan 28, 2026
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6 changes: 3 additions & 3 deletions nes_metroid/emulator/asm/part1.s
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Original file line number Diff line number Diff line change
Expand Up @@ -371,8 +371,8 @@ _0600666C:
str r0, [sp, #SP_890] @ SP_890 = 0x030073FF
mov r0, #0x820000
str r0, [sp, #SP_8AC] @ SP_8AC = 0x00820000
ldr r0, _060069D0 @ =sub_03000408
str r0, [sp, #SP_9B4] @ SP_9B4 = sub_03000408
ldr r0, _060069D0 @ =EmulatorAudio_WriteToApu
str r0, [sp, #SP_9B4] @ SP_9B4 = EmulatorAudio_WriteToApu
mov r0, #0xef
str r0, [sp, #SP_8B4] @ SP_8B4 = 0x000000EF
ldr r0, _060069D4 @ =0x03020100
Expand Down Expand Up @@ -525,7 +525,7 @@ _060069C0: .4byte 0x0203C000
_060069C4: .4byte _03002E68
_060069C8: .4byte 0x44444444
_060069CC: .4byte sub_06006000
_060069D0: .4byte sub_03000408
_060069D0: .4byte EmulatorAudio_WriteToApu
_060069D4: .4byte 0x03020100
_060069D8: .4byte 0x07060504
_060069DC: .4byte sub_03005568
Expand Down
114 changes: 57 additions & 57 deletions nes_metroid/emulator/asm/part2/part2_2.s
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Original file line number Diff line number Diff line change
Expand Up @@ -90,13 +90,13 @@ sub_03000634: @ 0x03000634
arm_func_start sub_03000638
sub_03000638: @ 0x03000638
push {r4, r5}
ldr r2, _03000978 @ =gUnk_03005A80
ldr r2, _03000978 @ =gEmuAudio_Pulse1_BufferPtr
ldr r2, [r2]
ldr r3, _0300097C @ =gUnk_03005A84
ldr r3, _0300097C @ =gEmuAudio_Pulse2_BufferPtr
ldr r3, [r3]
ldr r4, _03000980 @ =gUnk_03005A88
ldr r4, _03000980 @ =gEmuAudio_Triangle_BufferPtr
ldr r4, [r4]
ldr r5, _03000984 @ =gUnk_03005A8C
ldr r5, _03000984 @ =gEmuAudio_Noise_BufferPtr
ldr r5, [r5]
mov ip, #0
_03000660:
Expand Down Expand Up @@ -178,13 +178,13 @@ sub_03000704: @ 0x03000704
arm_func_start sub_03000708
sub_03000708: @ 0x03000708
push {r4, r5, r6, r7, r8, sb}
ldr r2, _03000990 @ =gUnk_03005A80
ldr r2, _03000990 @ =gEmuAudio_Pulse1_BufferPtr
ldr r2, [r2]
ldr r3, _03000994 @ =gUnk_03005A84
ldr r3, _03000994 @ =gEmuAudio_Pulse2_BufferPtr
ldr r3, [r3]
ldr r4, _03000998 @ =gUnk_03005A88
ldr r4, _03000998 @ =gEmuAudio_Triangle_BufferPtr
ldr r4, [r4]
ldr r5, _0300099C @ =gUnk_03005A8C
ldr r5, _0300099C @ =gEmuAudio_Noise_BufferPtr
ldr r5, [r5]
mov r8, #0x80
orr r8, r8, r8, lsl #8
Expand Down Expand Up @@ -220,13 +220,13 @@ sub_03000778: @ 0x03000778
.align 2, 0
_03000780: .4byte gUnk_03005A90

thumb_func_start sub_03000784
sub_03000784: @ 0x03000784
ldr r1, _0300078C @ =gUnk_03005AA8
thumb_func_start EmulatorAudio_Pulse1_SetLengthCounter
EmulatorAudio_Pulse1_SetLengthCounter: @ 0x03000784
ldr r1, _0300078C @ =gEmuAudio_Pulse1_LengthCounter
strh r0, [r1]
bx lr
.align 2, 0
_0300078C: .4byte gUnk_03005AA8
_0300078C: .4byte gEmuAudio_Pulse1_LengthCounter

thumb_func_start sub_03000790
sub_03000790: @ 0x03000790
Expand All @@ -244,7 +244,7 @@ _030007A4: .4byte gUnk_03005AA6
_030007A8:
ldr r0, _030007C0 @ =gUnk_03005AA6
strh r1, [r0]
ldr r0, _030007C4 @ =gUnk_03005A98
ldr r0, _030007C4 @ =gEmuAudio_Pulse1_Vol
ldrh r2, [r0]
movs r0, #0x10
ands r0, r2
Expand All @@ -256,7 +256,7 @@ _030007A8:
b _030007D0
.align 2, 0
_030007C0: .4byte gUnk_03005AA6
_030007C4: .4byte gUnk_03005A98
_030007C4: .4byte gEmuAudio_Pulse1_Vol
_030007C8: .4byte gUnk_03005A94
_030007CC:
ldr r1, _03000808 @ =gUnk_03005A94
Expand All @@ -266,22 +266,22 @@ _030007D0:
ldr r1, _0300080C @ =gUnk_03005AA2
movs r0, #0xf
strh r0, [r1]
ldr r1, _03000810 @ =sUnk_030023DC
ldr r0, _03000814 @ =gUnk_03005A9E
ldr r1, _03000810 @ =sEmulatorAudio_LengthCounterTable
ldr r0, _03000814 @ =gEmuAudio_Pulse1_Hi
ldrh r0, [r0]
lsrs r0, r0, #3
adds r0, r0, r1
ldrb r0, [r0]
lsls r0, r0, #2
bl sub_03000784
ldr r0, _03000818 @ =gUnk_03005A7A
bl EmulatorAudio_Pulse1_SetLengthCounter
ldr r0, _03000818 @ =gEmuAudio_SndChn
ldrh r1, [r0]
movs r2, #1
adds r0, r2, #0
ands r0, r1
cmp r0, #0
beq _03000802
ldr r0, _0300081C @ =gUnk_03005FCC
ldr r0, _0300081C @ =gEmuAudio_Pulse1_Enable
strh r2, [r0]
ldr r1, _03000820 @ =gUnk_03005AA4
movs r0, #0
Expand All @@ -293,16 +293,16 @@ _03000802:
.align 2, 0
_03000808: .4byte gUnk_03005A94
_0300080C: .4byte gUnk_03005AA2
_03000810: .4byte sUnk_030023DC
_03000814: .4byte gUnk_03005A9E
_03000818: .4byte gUnk_03005A7A
_0300081C: .4byte gUnk_03005FCC
_03000810: .4byte sEmulatorAudio_LengthCounterTable
_03000814: .4byte gEmuAudio_Pulse1_Hi
_03000818: .4byte gEmuAudio_SndChn
_0300081C: .4byte gEmuAudio_Pulse1_Enable
_03000820: .4byte gUnk_03005AA4

thumb_func_start sub_03000824
sub_03000824: @ 0x03000824
push {lr}
ldr r0, _03000840 @ =gUnk_03005FCC
ldr r0, _03000840 @ =gEmuAudio_Pulse1_Enable
ldrh r0, [r0]
cmp r0, #0
beq _0300083A
Expand All @@ -316,7 +316,7 @@ _0300083A:
pop {r0}
bx r0
.align 2, 0
_03000840: .4byte gUnk_03005FCC
_03000840: .4byte gEmuAudio_Pulse1_Enable
_03000844: .4byte gUnk_03005AA4

thumb_func_start sub_03000848
Expand All @@ -327,7 +327,7 @@ sub_03000848: @ 0x03000848
ldr r1, _03000864 @ =gUnk_03005AAC
movs r0, #0
strb r0, [r1]
ldr r0, _03000868 @ =gUnk_03005AA0
ldr r0, _03000868 @ =gEmuAudio_Pulse1_Timer
strh r2, [r0]
cmp r2, #0
bne _03000870
Expand All @@ -336,15 +336,15 @@ sub_03000848: @ 0x03000848
b _03000888
.align 2, 0
_03000864: .4byte gUnk_03005AAC
_03000868: .4byte gUnk_03005AA0
_03000868: .4byte gEmuAudio_Pulse1_Timer
_0300086C: .4byte gUnk_03005A94
_03000870:
ldr r4, _03000890 @ =gUnk_03005FD0
ldr r4, _03000890 @ =gEmuAudio_Pulse1_Frequency
adds r1, r2, #1
ldr r0, _03000894 @ =0x001B4F4D
bl __udivsi3
str r0, [r4]
ldr r2, _03000898 @ =gUnk_03005FC4
ldr r2, _03000898 @ =gEmuAudio_Pulse2_Frequency
ldr r1, [r2]
cmp r0, r1
bne _03000888
Expand All @@ -355,9 +355,9 @@ _03000888:
pop {r0}
bx r0
.align 2, 0
_03000890: .4byte gUnk_03005FD0
_03000890: .4byte gEmuAudio_Pulse1_Frequency
_03000894: .4byte 0x001B4F4D
_03000898: .4byte gUnk_03005FC4
_03000898: .4byte gEmuAudio_Pulse2_Frequency

thumb_func_start sub_0300089C
sub_0300089C: @ 0x0300089C
Expand All @@ -373,12 +373,12 @@ sub_0300089C: @ 0x0300089C
_030008AC: .4byte gUnk_03005A94
_030008B0: .4byte gUnk_03005AA2

thumb_func_start sub_030008B4
sub_030008B4: @ 0x030008B4
thumb_func_start EmulatorAudio_Pulse1_WriteVolume
EmulatorAudio_Pulse1_WriteVolume: @ 0x030008B4
push {r4, r5, lr}
lsls r0, r0, #0x18
lsrs r3, r0, #0x18
ldr r4, _03000908 @ =gUnk_03005A98
ldr r4, _03000908 @ =gEmuAudio_Pulse1_Vol
ldrb r1, [r4]
movs r2, #0x10
adds r0, r2, #0
Expand All @@ -405,7 +405,7 @@ _030008E6:
beq _03000900
cmp r1, #0
bne _03000900
ldr r0, _03000910 @ =gUnk_03005FCC
ldr r0, _03000910 @ =gEmuAudio_Pulse1_Enable
ldrh r0, [r0]
cmp r0, #0
beq _03000900
Expand All @@ -419,37 +419,37 @@ _03000900:
pop {r0}
bx r0
.align 2, 0
_03000908: .4byte gUnk_03005A98
_03000908: .4byte gEmuAudio_Pulse1_Vol
_0300090C: .4byte gUnk_03005AAD
_03000910: .4byte gUnk_03005FCC
_03000910: .4byte gEmuAudio_Pulse1_Enable
_03000914: .4byte gUnk_03005AA2

thumb_func_start sub_03000918
sub_03000918: @ 0x03000918
thumb_func_start EmulatorAudio_Pulse1_WriteSweep
EmulatorAudio_Pulse1_WriteSweep: @ 0x03000918
lsls r0, r0, #0x18
lsrs r0, r0, #0x18
ldr r1, _03000928 @ =gUnk_03005A9A
ldr r1, _03000928 @ =gEmuAudio_Pulse1_Sweep
strh r0, [r1]
ldr r1, _0300092C @ =gUnk_03005AAA
movs r0, #1
strh r0, [r1]
bx lr
.align 2, 0
_03000928: .4byte gUnk_03005A9A
_03000928: .4byte gEmuAudio_Pulse1_Sweep
_0300092C: .4byte gUnk_03005AAA

thumb_func_start sub_03000930
sub_03000930: @ 0x03000930
thumb_func_start EmulatorAudio_Pulse1_WriteLo
EmulatorAudio_Pulse1_WriteLo: @ 0x03000930
lsls r0, r0, #0x18
lsrs r0, r0, #0x18
ldr r1, _03000940 @ =gUnk_03005A9C
ldr r1, _03000940 @ =gEmuAudio_Pulse1_Lo
strh r0, [r1]
ldr r1, _03000944 @ =gUnk_03005AAC
movs r0, #1
strb r0, [r1]
bx lr
.align 2, 0
_03000940: .4byte gUnk_03005A9C
_03000940: .4byte gEmuAudio_Pulse1_Lo
_03000944: .4byte gUnk_03005AAC

thumb_func_start sub_03000948
Expand All @@ -459,12 +459,12 @@ sub_03000948: @ 0x03000948
ldrb r0, [r0]
cmp r0, #0
beq _03000966
ldr r0, _03000970 @ =gUnk_03005AA0
ldr r0, _03000970 @ =gEmuAudio_Pulse1_Timer
ldrh r1, [r0]
movs r0, #0xf0
lsls r0, r0, #4
ands r0, r1
ldr r1, _03000974 @ =gUnk_03005A9C
ldr r1, _03000974 @ =gEmuAudio_Pulse1_Lo
ldrh r1, [r1]
orrs r0, r1
bl sub_03000848
Expand All @@ -473,18 +473,18 @@ _03000966:
bx r0
.align 2, 0
_0300096C: .4byte gUnk_03005AAC
_03000970: .4byte gUnk_03005AA0
_03000974: .4byte gUnk_03005A9C
_03000970: .4byte gEmuAudio_Pulse1_Timer
_03000974: .4byte gEmuAudio_Pulse1_Lo

_03000978: .4byte gUnk_03005A80
_0300097C: .4byte gUnk_03005A84
_03000980: .4byte gUnk_03005A88
_03000984: .4byte gUnk_03005A8C
_03000978: .4byte gEmuAudio_Pulse1_BufferPtr
_0300097C: .4byte gEmuAudio_Pulse2_BufferPtr
_03000980: .4byte gEmuAudio_Triangle_BufferPtr
_03000984: .4byte gEmuAudio_Noise_BufferPtr

_03000988: .4byte 0x03005FE0
_0300098C: .4byte 0x03005FE0

_03000990: .4byte gUnk_03005A80
_03000994: .4byte gUnk_03005A84
_03000998: .4byte gUnk_03005A88
_0300099C: .4byte gUnk_03005A8C
_03000990: .4byte gEmuAudio_Pulse1_BufferPtr
_03000994: .4byte gEmuAudio_Pulse2_BufferPtr
_03000998: .4byte gEmuAudio_Triangle_BufferPtr
_0300099C: .4byte gEmuAudio_Noise_BufferPtr
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