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11-s205.asm
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;
; 11-s205.asm - kernel loader for ardungeon
;
; This source code is copyright (c) 2008 Jason Duerstock
; jason.duerstock@gmail.com
;
; The original program is copyright (c) 1987 Intellicreations Inc.
;
; This file is part of the ardungeon project which is an attempt to
; reverse engineer "Alternate Reality: The Dungeon" for the Atari 8-bit
; computer.
;
; ardungeon is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License version 2
; as published by the Free Software Foundation.
;
; ardungeon is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with ardungeon; if not, write to the
; Free Software Foundation, Inc.
; 51 Franklin Street, Fifth Floor
; Boston, MA 02110-1301 USA
;
.include "equates.inc"
.include "exp_kernel.inc"
.include "globals.inc"
.include "macros.inc"
; .ORG $8000
.SEGMENT "SEG8000"
sub_8000: ; CODE XREF: RAM:807Evp
LDA #$40 ; '@'
STA AR_POKMSK
LDA #0
STA IRQEN
STA NMIEN
STA $22F
STA $256
TAX
loc_8014: ; CODE XREF: sub_8000+17vj
STA 0,X
INX
BNE loc_8014
LDA #7
STA $237
dldi off_20E, loc_2297
dldi off_20C, loc_224F
dldi off_20A, loc_21E7
dldi off_216, loc_22AC
dldi off_208, loc_2653
dldi off_254, byte_199D
dldi off_222, loc_2347
JSR sub_819E
LDA byte_258
ASL A
ROL A
ROL A
AND #3
JSR sub_8158
LDA #$40 ; '@'
STA NMIEN
LDA AR_POKMSK
STA IRQEN
RTS
; End of function sub_8000
; ---------------------------------------------------------------------------
JSR sub_8000
LDA #$14
STA CHBASE
JSR sub_80BC
JSR sub_809F
LDA #0
JSR $1A0D
LDA #$40 ; '@'
STA AR_POKMSK
STA IRQEN
JSR sub_80D2
JMP $2EC6
; --------------- S U B R O U T I N E ---------------------------------------
sub_809F: ; CODE XREF: RAM:8089^p
LDX #2
LDA #0
loc_80A3: ; CODE XREF: sub_809F+Evj
STA byte_18C1,X
STA byte_18C4,X
STA byte_18C7,X
DEX
BPL loc_80A3
STA $1F
STA $20
STA $21
STA $25
STA $24
STA $26
RTS
; End of function sub_809F
; --------------- S U B R O U T I N E ---------------------------------------
sub_80BC: ; CODE XREF: RAM:8086^p
LDA #7
STA CONSOL_SAVE
LDA #0
STA $265
STA $2E
STA $18FF
STA $2F
LDA #$FF
STA $30
RTS
; End of function sub_80BC
; --------------- S U B R O U T I N E ---------------------------------------
sub_80D2: ; CODE XREF: RAM:8099^p
LDX #$1F
loc_80D4: ; CODE XREF: sub_80D2+9vj
LDA aSystemInitiali,X ; " System Initialization "
STA $197C,X
DEX
BPL loc_80D4
JSR $245D
loc_80E0: ; CODE XREF: sub_80D2+39vj
LDX #3
STX 6
loc_80E4: ; CODE XREF: sub_80D2+34vj
LDX 6
LDA #$FF
STA $24E,X
INX
TXA
AND #$F
ORA #$30 ; '0'
STA SDLST
JSR $24A3
BMI loc_8104
LDX 6
LDA byte_818A,X
STA $1998,X
INC $24E,X
loc_8104: ; CODE XREF: sub_80D2+25^j
DEC 6
BPL loc_80E4
LDA $24E,X
BMI loc_80E0
LDA #'1'
STA SDLST
LDA #4
STA 6
dldi off_9, $0280
dldi $2501, $0002
loc_8128: ; CODE XREF: sub_80D2+81vj
dmv word_232, $2501
loc_8134: ; CODE XREF: sub_80D2+65vj
JSR READSECTOR
BMI loc_8134
LDY #0
loc_813B: ; CODE XREF: sub_80D2+6Fvj
LDA $100,Y
STA (off_9),Y
INY
BPL loc_813B
LDA off_9
CLC
ADC #$80
STA off_9
BCC loc_814E
INC off_9+1
loc_814E: ; CODE XREF: sub_80D2+78^j
INC $2501
DEC 6
BNE loc_8128
JMP $27D8
; End of function sub_80D2
; --------------- S U B R O U T I N E ---------------------------------------
sub_8158: ; CODE XREF: sub_8000+6F^p
ASL A
ASL A
TAX
LDY #0
loc_815D: ; CODE XREF: sub_8158+Fvj
LDA a48k,X ; " 48K"
STA aSystemInitiali,Y ; " System Initialization "
INX
INY
CPY #4
BCC loc_815D
RTS
; End of function sub_8158
; ---------------------------------------------------------------------------
aSystemInitiali:.BYTE " System Initialization " ; DATA XREF: sub_80D2:loc_80D4^r
; sub_8158+8^w
byte_818A: .BYTE '1','2','3','4' ; DATA XREF: sub_80D2+29^r
a48k: .BYTE " 48K" ; DATA XREF: sub_8158:loc_815D^r
aqqk: .BYTE " ??K"
a64k: .BYTE " 64K"
a128k: .BYTE "128K"
; --------------- S U B R O U T I N E ---------------------------------------
sub_819E: ; CODE XREF: sub_8000+64^p
SEI
LDA #0
STA byte_258
LDA CONSOL
CMP #5 ; if select pressed
BEQ loc_8221 ; skip memory tests
LDA #$FE ; try turning off
STA PORTB ; the OS ROM
LDA $D800 ; load an OS location
TAX ; copy it to X
INX ; add 1
STX $D800 ; store it back
CPX $D800 ; did it change?
BNE loc_821C ; no, exit
DEX ; subtract 1
CMP $D800 ; test original value
BEQ loc_821C ; if the same, exit
dldi off_7, $8223 ; copy from the end of this block
dldi off_9, loc_F900 ; to $F900
ldxy $700 ; copy $700 bytes
JSR BLOCKMOVE ; move it!
LDA #$80 ; set the memory flag
STA byte_258 ; $80 = 64K machine
LDA CONSOL
CMP #3 ; if option pressed
BEQ loc_821C ; skip XE extended RAM test
LDX $4000 ; load top of XE bank
STX 4 ; save it
LDA #$E2 ; enable XE bank
STA PORTB
INX ; add 1
STX $4000 ; save it back
LDA #$FE ; disable XE bank
STA PORTB
CPX $4000 ; did it change?
BNE loc_8205 ; yes, skip restore
DEX ; no, subtract 1
STX $4000 ; restore original byte
JMP loc_821C ; leave
; ---------------------------------------------------------------------------
loc_8205: ; CODE XREF: sub_819E+5E^j
LDA #$E2 ; enable XE bank
STA PORTB
DEC $4000 ; subtract 1 from test byte
LDX $4000 ; load it again
CPX 4 ; test v. saved value
BNE loc_821C ; if it's different, bail
LDA #$C0 ; set 128K bit
STA byte_258 ; in memory flag
JSR loc_F9CF ; perform XE RAM init
loc_821C: ; CODE XREF: sub_819E+1D^j sub_819E+23^j ...
LDA #$FE ; turn OS ROM off
STA PORTB
loc_8221: ; CODE XREF: sub_819E+B^j
CLI ; enable interrupts
RTS
; End of function sub_819E
; ---------------------------------------------------------------------------
.SEGMENT "SEGF900"
loc_F900:
LDA SEGNO ; load segment number
CMP #8 ; segments 1-7 are maps
BCS loc_F937 ; is it a map?
STA byte_F9CE ; yes, back it up
dldi off_7, SEG_AC00 ; copy from $AC00
dldi off_9, $C000 ; copy to $C000
ldxy $1000 ; copy $1000 bytes
JSR BLOCKMOVE ; move it
dldi off_7, $BC00 ; copy from $BC00
dldi off_9, $D800 ; to $D800
ldxy $400 ; copy $400 bytes
BEQ loc_F94E ; always true; jump to F94E
loc_F937: ; CODE XREF: RAM:8228^j
STA byte_F9CD ; it's not a map
dldi off_7, $96F0 ; copy from $96F0
dldi off_9, $DC00 ; to $DC00
ldxy $1510 ; copy $1510 bytes
loc_F94E: ; CODE XREF: RAM:8258^j
JSR BLOCKMOVE ; move it
CLC
RTS ; return
; ---------------------------------------------------------------------------
loc_F953:
LDA SEGNO
CMP #8
BCS loc_F98C
CMP byte_F9CE
BNE loc_F9AA
dldi off_7, $C000
dldi off_9, SEG_AC00
ldxy $1000
JSR BLOCKMOVE
dldi off_7, $D800
dldi off_9, $BC00
ldxy $400
BEQ loc_F9A5
loc_F98C: ; CODE XREF: RAM:F958^j
CMP byte_F9CD
BNE loc_F9AA
dldi off_7, $DC00
dldi off_9, $96F0
ldxy $1510
loc_F9A5: ; CODE XREF: RAM:F98A^j
JSR BLOCKMOVE
CLC
RTS
; ---------------------------------------------------------------------------
loc_F9AA: ; CODE XREF: RAM:8280^j RAM:82B2^j
SEC
RTS
; ---------------------------------------------------------------------------
loc_F9AC:
BIT NMIST
BPL loc_F9B4
JMP (off_200)
; ---------------------------------------------------------------------------
loc_F9B4: ; CODE XREF: RAM:82D2^j
PHA
LDA NMIST
AND #$20 ; ' '
BEQ loc_F9BF
JMP $D800
; ---------------------------------------------------------------------------
loc_F9BF: ; CODE XREF: RAM:82DD^j
TXA
PHA
TYA
PHA
STA NMIRES
JMP (VVBLKI)
; ---------------------------------------------------------------------------
loc_F9C9:
CLD
JMP (off_216)
; ---------------------------------------------------------------------------
byte_F9CD: .BYTE $FF
byte_F9CE: .BYTE $FF
; ---------------------------------------------------------------------------
loc_F9CF:
LDX #$FF
loc_F9D1: ; CODE XREF: RAM:82F9vj
TXA ; A = X
DEX ; subtract 1
STA byte_FBA5,X ; save it in $FBA5+X
BNE loc_F9D1 ; keep going until 0
STX $FCA4
LDX #0
loc_F9DD: ; CODE XREF: RAM:8307vj
TXA
INX
STA byte_FBA5+$100,X
CPX #$FF
BNE loc_F9DD
LDA #$FF
LDX #$FE
loc_F9EA: ; CODE XREF: RAM:8314vj
STA byte_FBA5+$200,X
STA byte_FBA5+$300,X
DEX
BNE loc_F9EA
RTS
; ---------------------------------------------------------------------------
loc_F9F4:
LDA #$80
STA $25D
LDY word_232+1
STY $263
LDA word_232
STA $262
LSR A
BCS loc_FA1E
ROL A
SEC
SBC #1
STA $260
STA $25E
TYA
SBC #0
STA $261
STA $25F
JMP loc_FA33
; ---------------------------------------------------------------------------
loc_FA1E: ; CODE XREF: RAM:8329^j
ROL A
STA $25E
STY $25F
ADC #1
STA $260
BCC loc_FA2D
INY
loc_FA2D: ; CODE XREF: RAM:834D^j
STY $261
ASL $25D
loc_FA33:
LDX #0
loc_FA35: ; CODE XREF: RAM:8364vj RAM:836Fvj
LDA byte_FBA5,X
BEQ loc_FA78
TAX
LDA byte_FBA5+$200,X
CMP $25E
BNE loc_FA35
LDA $25F
ORA $25C
CMP byte_FBA5+$300,X
BNE loc_FA35
BIT $264
BPL loc_FA5B
LDA #$FF
STA byte_FBA5+$300,X
JMP loc_FA78
; ---------------------------------------------------------------------------
loc_FA5B: ; CODE XREF: RAM:8374^j
JSR sub_FB62
JSR sub_FB73
JSR sub_FB88
STA loc_FA6C+1
STY loc_FA6C+2
LDY #0
loc_FA6C: ; CODE XREF: RAM:8396vj
LDA $FFFF,Y
STA $100,Y
INY
BPL loc_FA6C
JMP $FB4C
; ---------------------------------------------------------------------------
loc_FA78: ; CODE XREF: RAM:835B^j
BIT $25B
BMI loc_FAA9
LDA word_1903
STA word_232
LDA word_1903+1
STA word_232+1
LDA #2
STA 6
loc_FA8D: ; CODE XREF: RAM:83B7vj
JSR READSECTOR
BPL loc_FA99
DEC 6
BNE loc_FA8D
loc_FA96: ; CODE XREF: RAM:83C4vj
JMP loc_FB0C
; ---------------------------------------------------------------------------
loc_FA99: ; CODE XREF: RAM:83B3^j
LDX #3
loc_FA9B: ; CODE XREF: RAM:83C7vj
LDA $100,X
CMP $1905,X
BNE loc_FA96
DEX
BPL loc_FA9B
DEC $25B
loc_FAA9: ; CODE XREF: RAM:839E^j
dmv word_232, $260
LDA #2
STA 6
loc_FAB9: ; CODE XREF: RAM:83E3vj
JSR READSECTOR
BPL loc_FAC4
DEC 6
BNE loc_FAB9
BEQ loc_FB0C
loc_FAC4: ; CODE XREF: RAM:83DF^j
LDX $FDA4
JSR sub_FB88
STY loc_FAD7+2
EOR #$80
STA loc_FAD7+1
LDY #0
loc_FAD4: ; CODE XREF: RAM:83FEvj
LDA $100,Y
loc_FAD7:
STA $FFFF,Y
INY
BPL loc_FAD4
LDA #$FE
STA PORTB
LDA #$40
STA NMIEN
CLI
LDX $FDA4
LDA #$FF
STA byte_FBA5+$300,X
STA byte_FBA5+$200,X
dmv word_232, $262
LDA #2
STA 6
loc_FB03: ; CODE XREF: RAM:842Dvj
JSR READSECTOR
BPL loc_FB20
DEC 6
BNE loc_FB03
loc_FB0C: ; CODE XREF: RAM:83E5^j
dmv word_232, $262
LDA #0
STA $25B
LDY #$FF
RTS
; ---------------------------------------------------------------------------
loc_FB20: ; CODE XREF: RAM:8429^j
LDX $FDA4
LDA $25F
ORA $25C
STA byte_FBA5+$300,X
LDA $25E
STA byte_FBA5+$200,X
JSR sub_FB62
JSR sub_FB73
JSR sub_FB88
STA loc_FB46+1
STY loc_FB46+2
LDY #0
loc_FB43: ; CODE XREF: RAM:846Dvj
LDA $100,Y
loc_FB46:
STA $FFFF,Y
INY
BPL loc_FB43
INC word_232
BNE loc_FB54
INC word_232+1
loc_FB54: ; CODE XREF: RAM:8472^j
LDA #$FE
STA PORTB
LDA #$40
STA NMIEN
CLI
LDY #1
RTS
; ---------------------------------------------------------------------------
sub_FB62:
LDY byte_FBA5+$100,X
LDA byte_FBA5,X
STA byte_FBA5,Y
TAY
LDA byte_FBA5+$100,X
STA byte_FBA5+$100,Y
RTS
; ---------------------------------------------------------------------------
sub_FB73:
LDA byte_FBA5
STA byte_FBA5,X
STX byte_FBA5
TAY
LDA byte_FBA5+$100,Y
STA byte_FBA5+$100,X
TXA
STA byte_FBA5+$100,Y
RTS
; ---------------------------------------------------------------------------
sub_FB88:
SEI
LDY #0
STY NMIEN
TXA
ASL A
ROL A
ROL A
ASL A
ASL A
AND #$C
ORA #$E2
STA PORTB
TXA
AND #$3F ; '?'
ORA #$40 ; '@'
TAY
LDA $25D
RTS
; ---------------------------------------------------------------------------
byte_FBA5:
.BYTE 2
; ---------------------------------------------------------------------------
STA $6283
JSR $5835
BCS loc_84D4
JMP $5209
; ---------------------------------------------------------------------------
loc_84D4: ; CODE XREF: RAM:84CF^j
JMP $5225
; ---------------------------------------------------------------------------
LDX #0
loc_84D9: ; CODE XREF: RAM:84E3vj
LDA $63A2,X
CMP #$FF
BEQ loc_84E7
INX
CPX #4
BCC loc_84D9
BCS loc_84EB
loc_84E7: ; CODE XREF: RAM:84DE^j
TXA
JMP $555A
; ---------------------------------------------------------------------------
loc_84EB: ; CODE XREF: RAM:84E5^j
LDX #$31 ; '1'
STX $5D51
INX
STX $5D67
INX
STX $5D7D
INX
STX $5D93
JSR $502E
dldi off_193A, $5F85
dldi off_1944, $5F3D
LDX #3
loc_8515: ; CODE XREF: RAM:851Cvj
LDA $63A2,X
STA $1946,X
DEX
BPL loc_8515
JSR $508C
loc_8521: ; CODE XREF: RAM:852Avj
JSR $5049
BCC loc_852C
CMP #$1B
BEQ loc_853A
BNE loc_8521
loc_852C: ; CODE XREF: RAM:8524^j
CLC
ADC #6
STA $6283
JSR $5835
BCS loc_853A
JMP $5209
; ---------------------------------------------------------------------------
loc_853A: ; CODE XREF: RAM:8528^j RAM:8535^j
JMP $5225
; ---------------------------------------------------------------------------
DEC $627F
LDA $6398
BPL loc_8548
JMP $56C1
; ---------------------------------------------------------------------------
loc_8548: ; CODE XREF: RAM:8543^j
LDA #4
LDY #2
JSR $56D7
LDY #0
LDA (off_41),Y
AND #$78
BEQ loc_8561
LDX #0
loc_8559: ; CODE XREF: RAM:855Fvj
CMP $559E,X
BEQ loc_8567
DEX
BPL loc_8559
loc_8561: ; CODE XREF: RAM:8555^j
JSR $5602
JMP $5209
; ---------------------------------------------------------------------------
loc_8567: ; CODE XREF: RAM:855C^j
LDA $559F,X
PHA
LDA $55A0,X
PHA
RTS
; ---------------------------------------------------------------------------
PHP
EOR $A0,X
LDY #0
LDA (off_43),Y
TAX
ORA #$80
STA $51
TYA
STA $6390,X
JSR $55B7
JSR $5602
JMP $5209
; ---------------------------------------------------------------------------
dldi off_3D, $6500
ldi $49, $0
loc_8595: ; CODE XREF: RAM:85B3vj
LDY #0
LDA (off_3D),Y
AND #$83
CMP $51
BNE loc_85A2
JSR $4A01
loc_85A2: ; CODE XREF: RAM:859D^j
LDA off_3D
CLC
ADC #$10
STA off_3D
BCC loc_85AD
INC off_3D+1
loc_85AD: ; CODE XREF: RAM:85A9^j
INC $49
LDA $49
CMP #$40 ; '@'
BCC loc_8595
LDA $51
AND #3
CMP #3
BNE locret_85D3
TAX
LDA #0
STA $6390,X
LDX #0
loc_85C5: ; CODE XREF: RAM:85D1vj
LDA #0
STA $6350,X
TXA
CLC
ADC #8
TAX
CMP #$38 ; '8'
BCC loc_85C5
locret_85D3: ; CODE XREF: RAM:85BB^j
RTS
; ---------------------------------------------------------------------------
CLC
LDA #6
ADC off_41
STA $193C
STA off_7
LDA #0
ADC off_41+1
STA $193C+1
STA off_7+1
LDY #6
LDA (off_7),Y
BNE loc_85F1
LDA #$20 ; ' '
STA (off_7),Y
loc_85F1: ; CODE XREF: RAM:85EB^j
dldi off_16, $60E8
LDX $194A
JSR $3C5C
LDA #2
JMP $2BFC
; ---------------------------------------------------------------------------
LDY #0
LDA (off_41),Y
AND #$78 ; 'x'
BEQ loc_8616
LDX #0
loc_860E: ; CODE XREF: RAM:8614vj
CMP $564F,X
BEQ loc_8619
DEX
BPL loc_860E
loc_8616: ; CODE XREF: RAM:860A^j
JMP $5209
; ---------------------------------------------------------------------------
loc_8619: ; CODE XREF: RAM:8611^j
LDA $5651,X
PHA
LDA $5650,X
PHA
; ---------------------------------------------------------------------------
.BYTE $FF
.WORD $5208
; ---------------------------------------------------------------------------
RTS
; ---------------------------------------------------------------------------
AND #3
TAX
LDA $565F,X
PHA
LDA $5663,X
PHA
RTS
; ---------------------------------------------------------------------------
LSR $56,X
LSR $57,X
ROR $A6
SBC #$22 ; '"'
LDA I_FOOD
BNE loc_8641
JMP $5774
; ---------------------------------------------------------------------------
loc_8641: ; CODE XREF: RAM:863C^j
DEC I_FOOD
LDA $6398
BMI loc_8663
LDA $6399
LSR A
LSR A
LSR A
LSR A
TAX
LDA $6054,X
LDX #$99
JSR $2E43
LDA #$1C
LDX #$98
JSR $2E43
JMP $5225
; ---------------------------------------------------------------------------
loc_8663: ; CODE XREF: RAM:8647^j
dldi off_16, $5FEF
LDX $194A
JSR $3C5C
LDA #$10
JSR $2BFC
JMP $5225
; ---------------------------------------------------------------------------
LDA $63BC
BNE loc_8681
JMP $5774
; ---------------------------------------------------------------------------
loc_8681: ; CODE XREF: RAM:867C^j
DEC $63BC
LDA $6398
BMI loc_8693
LDA #$10
LDY #8
JSR $56D7
JMP $5225
; ---------------------------------------------------------------------------
loc_8693: ; CODE XREF: RAM:8687^j
dldi off_16, $6064
LDX $194A
JSR $3C5C
LDA #$10
JSR $2BFC
JMP $5225
; ---------------------------------------------------------------------------
PHA
TYA
LDX #$98
JSR $2E43
PLA
LDX #$9A
JMP $2E43
; ---------------------------------------------------------------------------
loc_86B6: ; CODE XREF: RAM:86D3vj RAM:86DAvj
JSR $57DC
JMP $5225
; ---------------------------------------------------------------------------
LDA $63BD
BNE loc_86C7
JMP $5774
; ---------------------------------------------------------------------------
loc_86C4: ; CODE XREF: RAM:86CAvj
JMP $5225
; ---------------------------------------------------------------------------
loc_86C7: ; CODE XREF: RAM:86BF^j
JSR $57AB
BCS loc_86C4
ldxy $6129
JSR $4B4D
BMI loc_86B6
LDA #$88
JSR $49B0
BMI loc_86B6
LDY #2
loc_86DE: ; CODE XREF: RAM:86E6vj
LDA $611A,Y
STA (off_3D),Y
INY
CPY #$F
BNE loc_86DE
LDA $4B
STA (off_3D),Y
DEC $63BD
INC $6390
JMP $54AF
; ---------------------------------------------------------------------------
LDA $63C1
BEQ loc_8746
dldi off_16, $6161
JSR $2E31
LDA #$73
LDX $6309
CPX #1
BNE loc_8710
LDA #$20
loc_8710: ; CODE XREF: RAM:870C^j
STA $6176
LDA #1
CPX #$A
BCC loc_871B
LDA #2
loc_871B: ; CODE XREF: RAM:8717^j
STA $616E
LDA $630A
LDY #1
CMP #$A
BCC loc_8729
LDY #2
loc_8729: ; CODE XREF: RAM:8725^j
STY $6186