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Commented and labeled register and vram init

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This commit is contained in:
p4plus2 2017-08-24 19:14:52 -07:00
parent 357f0fcc92
commit f0863690a0
3 changed files with 91 additions and 91 deletions
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178
bank_80.asm
View file

@ -262,7 +262,7 @@ RESET_start:
TXS ;$8084CB |/
%return(display_error_message) ;$8084CC | Push address to decompress and display the message
%return(clear_vram) ;$8084CF | Push address for clearing vram
BRA initialize_registers ;$8084D2 / Initialize MMIO registers
BRA init_registers ;$8084D2 / Initialize MMIO registers
.final_piracy_test ; \
PHK ;$8084D4 |\ Set current databank
@ -284,94 +284,94 @@ RESET_start:
TXS ;$8084F1 |/
%return(CODE_8085B9) ;$8084F2 | Push address to run Rareware logo
%return(clear_vram) ;$8084F5 | Push address for clearing VRAM
initialize_registers: ; |
SEP #$30 ;$8084F8 |
LDX #$00 ;$8084FA |
CODE_8084FC: ; |
STZ $2101,x ;$8084FC |
STZ $2101,x ;$8084FF |
INX ;$808502 |
CPX #$34 ;$808503 |
BNE CODE_8084FC ;$808505 |
LDX #$00 ;$808507 |
CODE_808509: ; |
STZ $4202,x ;$808509 |
INX ;$80850C |
CPX #$0B ;$80850D |
BNE CODE_808509 ;$80850F |
LDA #$8F ;$808511 |
STA $2100 ;$808513 |
LDA #$80 ;$808516 |
STA $2115 ;$808518 |
STA $211A ;$80851B |
LDA #$01 ;$80851E |
STA $420D ;$808520 |
STZ $2131 ;$808523 |
STZ $2133 ;$808526 |
STZ $4200 ;$808529 |
LDA #$FF ;$80852C |
STA $4201 ;$80852E |
LDA #$E0 ;$808531 |
STA $2132 ;$808533 |
LDA #$30 ;$808536 |
STA $2130 ;$808538 |
LDA #$00 ;$80853B |
STA $2106 ;$80853D |
STZ $210D ;$808540 |
STZ $210D ;$808543 |
STZ $210F ;$808546 |
STZ $210F ;$808549 |
STZ $2111 ;$80854C |
STZ $2111 ;$80854F |
LDA #$FF ;$808552 |
STA $210E ;$808554 |
STA $210E ;$808557 |
STA $2110 ;$80855A |
STA $2110 ;$80855D |
STA $2112 ;$808560 |
STA $2112 ;$808563 |
REP #$30 ;$808566 |
SEP #$20 ;$808568 |
LDX #$000A ;$80856A |
CODE_80856D: ; |
STZ $4300,x ;$80856D |
STZ $4310,x ;$808570 |
STZ $4320,x ;$808573 |
STZ $4330,x ;$808576 |
STZ $4340,x ;$808579 |
STZ $4350,x ;$80857C |
STZ $4360,x ;$80857F |
STZ $4370,x ;$808582 |
DEX ;$808585 |
BPL CODE_80856D ;$808586 |
REP #$20 ;$808588 |
init_registers: ; |
SEP #$30 ;$8084F8 | Use 8 bit to manipulate MMIO
LDX #$00 ;$8084FA | Reset index to clear PPU MMIO
.clear_PPU ; |
STZ $2101,x ;$8084FC |\ Clear $2101 - $2134
STZ $2101,x ;$8084FF | | Clear twice to handle write twice registers
INX ;$808502 | |
CPX #$34 ;$808503 | |
BNE .clear_PPU ;$808505 |/
LDX #$00 ;$808507 | Reset index to clear CPU MMIO
.clear_CPU ; |
STZ $4202,x ;$808509 |\ Clear 4202-420C
INX ;$80850C | |
CPX #$0B ;$80850D | |
BNE .clear_CPU ;$80850F |/
LDA #$8F ;$808511 |\ Enable F-Blank with full brightness
STA $2100 ;$808513 |/
LDA #$80 ;$808516 |\
STA $2115 ;$808518 | | Increment VRAM after high byte write
STA $211A ;$80851B |/ Use large mode 7 tilemap bounds
LDA #$01 ;$80851E |\ Enable fastROM
STA $420D ;$808520 |/
STZ $2131 ;$808523 | Disable color math
STZ $2133 ;$808526 | Reset screen mode
STZ $4200 ;$808529 | Disable interrupts and autojoy
LDA #$FF ;$80852C |\ Initalize outport (unused)
STA $4201 ;$80852E |/
LDA #$E0 ;$808531 |\ Set fixed color
STA $2132 ;$808533 |/
LDA #$30 ;$808536 |\ Clear color math settings
STA $2130 ;$808538 |/
LDA #$00 ;$80853B |\ Disable mosaic
STA $2106 ;$80853D |/
STZ $210D ;$808540 |\ Clear layer 1-3 horizontal scroll (Layer 1)
STZ $210D ;$808543 | |
STZ $210F ;$808546 | | Layer 2
STZ $210F ;$808549 | |
STZ $2111 ;$80854C | | Layer 3
STZ $2111 ;$80854F |/
LDA #$FF ;$808552 |\ Set layer 1-3 vertical scroll to $FFFF
STA $210E ;$808554 | | Layer 1
STA $210E ;$808557 | |
STA $2110 ;$80855A | | Layer 2
STA $2110 ;$80855D | |
STA $2112 ;$808560 | | Layer 3
STA $2112 ;$808563 |/
REP #$30 ;$808566 | Restore to 16 bit access...
SEP #$20 ;$808568 | ...Just to make A 8 bit again
LDX #$000A ;$80856A | Load up the number of H/DMA bytes to clear
.clear_DMA ; |
STZ $4300,x ;$80856D |\ Zero out channels 0-7
STZ $4310,x ;$808570 | |
STZ $4320,x ;$808573 | |
STZ $4330,x ;$808576 | |
STZ $4340,x ;$808579 | |
STZ $4350,x ;$80857C | |
STZ $4360,x ;$80857F | |
STZ $4370,x ;$808582 | |
DEX ;$808585 | | Next byte
BPL .clear_DMA ;$808586 |/ Continue until addresses from all channel are clear
REP #$20 ;$808588 | Back to a full 16 bit
RTS ;$80858A /
CODE_80858B:
JSR initialize_registers ;$80858B \
init_registers_wrapper:
JSR init_registers ;$80858B \ Wrapper for long calls
RTL ;$80858E /
DATA_80858F:
db $00, $00
vram_zero_const:
dw $0000 ;$80858F > Used for vram fill byte
clear_vram:
STZ $2116 ;$808591 \
LDA #DATA_80858F ;$808594 |
STA $4302 ;$808597 |
STA $4308 ;$80859A |
STZ $4305 ;$80859D |
LDA #$1809 ;$8085A0 |
STA $4300 ;$8085A3 |
STZ $2116 ;$808591 \ Initialize VRAM to zeros
LDA #vram_zero_fill ;$808594 |\ Set DMA source word
STA $4302 ;$808597 |/
STA $4308 ;$80859A | Set HDMA word (not used.)
STZ $4305 ;$80859D | Set size to zero, (full 64K)
LDA #$1809 ;$8085A0 |\ Set DMA destination 2118, fixed transfer,
STA $4300 ;$8085A3 |/ with two register write once
SEP #$20 ;$8085A6 |
LDA #DATA_80858F>>16 ;$8085A8 |
STA $4304 ;$8085AA |
LDA #$01 ;$8085AD |
STA $420B ;$8085AF |
LDA #vram_zero_fill>>16 ;$8085A8 |\ Set DMA source bank
STA $4304 ;$8085AA |/
LDA #$01 ;$8085AD |\
STA $420B ;$8085AF |/ Enable channel 1 DMA
REP #$20 ;$8085B2 |
RTS ;$8085B4 /
CODE_8085B5:
JSR clear_vram ;$8085B5 \
clear_vram_wrapper:
JSR clear_vram ;$8085B5 \ Wrapper for long calls
RTL ;$8085B8 /
CODE_8085B9:
@ -1734,7 +1734,7 @@ CODE_8090DA:
JSR CODE_8090CD ;$8090DA \
LDA #$002C ;$8090DD |
STA $78 ;$8090E0 |
JSR initialize_registers ;$8090E2 |
JSR init_registers ;$8090E2 |
JSR clear_vram ;$8090E5 |
STZ $2A ;$8090E8 |
LDA #$AA55 ;$8090EA |
@ -2498,7 +2498,7 @@ CODE_8097CD:
PHK ;$8097D1 |
PLB ;$8097D2 |
JSR clear_vram ;$8097D3 |
JSL CODE_80858B ;$8097D6 |
JSL init_registers_wrapper ;$8097D6 |
JSL CODE_808E6A ;$8097DA |
JSL CODE_8088AB ;$8097DE |
STZ $060B ;$8097E2 |
@ -3243,7 +3243,7 @@ CODE_809F85:
PHK ;$809F89 |
PLB ;$809F8A |
JSR clear_vram ;$809F8B |
JSL CODE_80858B ;$809F8E |
JSL init_registers_wrapper ;$809F8E |
JSL CODE_808E6A ;$809F92 |
JSL CODE_BB91F7 ;$809F96 |
STZ $2A ;$809F9A |
@ -3918,7 +3918,7 @@ CODE_80A5F1:
PHK ;$80A5F5 |
PLB ;$80A5F6 |
JSR clear_vram ;$80A5F7 |
JSL CODE_80858B ;$80A5FA |
JSL init_registers_wrapper ;$80A5FA |
JSL CODE_808E6A ;$80A5FE |
JSL CODE_8088AB ;$80A602 |
LDA #$0018 ;$80A606 |
@ -5444,7 +5444,7 @@ CODE_80B3D7:
STZ $099B ;$80B3DD |
STZ $060B ;$80B3E0 |
JSR clear_vram ;$80B3E3 |
JSL CODE_80858B ;$80B3E6 |
JSL init_registers_wrapper ;$80B3E6 |
JSL CODE_8088D2 ;$80B3EA |
JSL CODE_BB91F7 ;$80B3EE |
LDA #$0002 ;$80B3F2 |
@ -5667,7 +5667,7 @@ CODE_80B560:
CODE_80B5FA:
JSL CODE_BB91D9 ;$80B5FA \
JSL clear_vram ;$80B5FE |
JSL CODE_80858B ;$80B602 |
JSL init_registers_wrapper ;$80B602 |
JSL CODE_BB91F7 ;$80B606 |
LDA #$0001 ;$80B60A |
STA $2105 ;$80B60D |
@ -12660,8 +12660,8 @@ CODE_80F3FB:
JSL CODE_BB91D9 ;$80F3FB \
PHK ;$80F3FF |
PLB ;$80F400 |
JSL CODE_8085B5 ;$80F401 |
JSL CODE_80858B ;$80F405 |
JSL clear_vram_wrapper ;$80F401 |
JSL init_registers_wrapper ;$80F405 |
JSL CODE_808E6A ;$80F409 |
JSL CODE_8088AB ;$80F40D |
JSL CODE_BB91F7 ;$80F411 |
@ -13242,8 +13242,8 @@ CODE_80FA7C:
JSL CODE_BB91D9 ;$80FA7C \
PHK ;$80FA80 |
PLB ;$80FA81 |
JSL CODE_8085B5 ;$80FA82 |
JSL CODE_80858B ;$80FA86 |
JSL clear_vram_wrapper ;$80FA82 |
JSL init_registers_wrapper ;$80FA86 |
LDA #$001F ;$80FA8A |
JSL CODE_BB80B0 ;$80FA8D |
LDA #$001F ;$80FA91 |

2
bank_B5.asm
View file

@ -7877,7 +7877,7 @@ CODE_B5CDFD:
STA $0006B1 ;$B5CDFD \
JSL CODE_BB91D9 ;$B5CE01 |
JSL CODE_8088D2 ;$B5CE05 |
JSL CODE_80858B ;$B5CE09 |
JSL init_registers_wrapper ;$B5CE09 |
JSL CODE_808E6A ;$B5CE0D |
PHK ;$B5CE11 |
PLB ;$B5CE12 |

2
bank_BB.asm
View file

@ -2775,7 +2775,7 @@ CODE_BB9265: ; |
LDA #$A002 ;$BB9265 |
TRB $08C2 ;$BB9268 |
STZ $17C8 ;$BB926B |
JSL CODE_80858B ;$BB926E |
JSL init_registers_wrapper ;$BB926E |
JSL CODE_8088D2 ;$BB9272 |
JSR CODE_BB91FB ;$BB9276 |
JSL CODE_8085B5 ;$BB9279 |