empathicqubit/DKC2-disassembly
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More commenting of SPC code including code that runs sound engine.

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This commit is contained in:
p4plus2 2017-08-29 05:46:23 -07:00
parent 4fe7375ea9
commit 9874e8a36d
1 changed files with 17 additions and 16 deletions
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33
bank_B5.asm
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@ -155,7 +155,7 @@ CODE_B580D5:
JSR CODE_B58469 ;$B580E0 |
JSR CODE_B5825C ;$B580E3 |
JSR CODE_B58277 ;$B580E6 |
JSR CODE_B581AC ;$B580E9 |
JSR execute_spc_sound_engine ;$B580E9 |
PLB ;$B580EC |
RTL ;$B580ED /
@ -185,7 +185,7 @@ CODE_B58106:
JSR CODE_B5825C ;$B58114 |
JSR CODE_B58277 ;$B58117 |
JSR CODE_B5816D ;$B5811A |
JSR CODE_B581AC ;$B5811D |
JSR execute_spc_sound_engine ;$B5811D |
LDX #$00FE ;$B58120 |
JSR CODE_B581FB ;$B58123 |
LDA $1E ;$B58126 |
@ -209,7 +209,7 @@ CODE_B58132:
JSR CODE_B5825C ;$B58144 |
JSR CODE_B58277 ;$B58147 |
JSR CODE_B5816D ;$B5814A |
JSR CODE_B581AC ;$B5814D |
JSR execute_spc_sound_engine ;$B5814D |
PLA ;$B58150 |
AND #$FF00 ;$B58151 |
ORA #$00FB ;$B58154 |
@ -246,28 +246,29 @@ CODE_B5818D:
RTL ;$B58190 /
CODE_B58191:
JSR upload_spc_base_engine ;$B58191 \
JSR upload_spc_sound_engine ;$B58194 |
JSR upload_spc_base_engine ;$B58191 \ Upload the core of the SPC engine
JSR upload_spc_sound_engine ;$B58194 | Upload the sound processor of the SPC engine
JSR CODE_B582A9 ;$B58197 |
LDA #DATA_F2E730 ;$B5819A |
STA $32 ;$B5819D |
LDA.w #DATA_F2E730>>16 ;$B5819F |
STA $34 ;$B581A2 |
LDA #DATA_F2E730 ;$B5819A |\
STA $32 ;$B5819D | |
LDA.w #DATA_F2E730>>16 ;$B5819F | |
STA $34 ;$B581A2 |/
JSR upload_inline_spc_block ;$B581A4 |
JSR CODE_B581AC ;$B581A7 |
JSR execute_spc_sound_engine ;$B581A7 | Jump to the sound engine entry
RTS ;$B581AA /
CODE_B581AB:
RTS ;$B581AB /
CODE_B581AC:
LDA #$0672 ;$B581AC \
STA $35 ;$B581AF |
STZ $37 ;$B581B1 |
execute_spc_sound_engine: ; \
LDA #$0672 ;$B581AC |\ Load the sound engine entry point
STA $35 ;$B581AF |/
STZ $37 ;$B581B1 | Zero size transfer means execute jump
JSR upload_spc_block ;$B581B3 |
RTS ;$B581B6 /
CODE_B581B7:
LDA #$06E3 ;$B581B7 \
LDA #$06E3 ;$B581B7 \ Dead code, would crash SPC engine.
STA $35 ;$B581BA |
STZ $37 ;$B581BC |
JSR upload_spc_block ;$B581BE |
@ -615,7 +616,7 @@ upload_spc_block:
INX ;$B5842B |\ Increment and set the transaction id
STX $2140 ;$B5842C |/
LDA $37 ;$B5842F |\ If there are no bytes to transfer simply exit
BEQ .return ;$B58431 |/
BEQ .return ;$B58431 |/ This means we were only executing a jump
LDY #$00 ;$B58433 |
.next_byte ; |
LDA [$32],y ;$B58435 | Load next byte