Event command $DF

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Event command $DF

Postby Lenophis » Thu Mar 12, 2009 4:42 am

I don't think I like this command much.

Code: Select all
Load CaseWord with available characters
(gen. act. E3)

C0/B3B7:   7B         TDC
C0/B3B8:   8DB41E     STA $1EB4
C0/B3BB:   8DB51E     STA $1EB5
C0/B3BE:   A600       LDX $00
C0/B3C0:   9B         TXY
C0/B3C1:   B96708     LDA $0867,Y
C0/B3C4:   2907       AND #$07
C0/B3C6:   F00A       BEQ $B3D2
C0/B3C8:   ADB41E     LDA $1EB4
C0/B3CB:   1FFCBAC0   ORA $C0BAFC,X
C0/B3CF:   8DB41E     STA $1EB4
C0/B3D2:   C221       REP #$21
C0/B3D4:   98         TYA
C0/B3D5:   692900     ADC #$0029
C0/B3D8:   A8         TAY
C0/B3D9:   7B         TDC
C0/B3DA:   E220       SEP #$20      (8 bit accum./memory)
C0/B3DC:   E8         INX
C0/B3DD:   E00800     CPX #$0008
C0/B3E0:   D0DF       BNE $B3C1
C0/B3E2:   A600       LDX $00
C0/B3E4:   9B         TXY
C0/B3E5:   B9AF09     LDA $09AF,Y
C0/B3E8:   2907       AND #$07
C0/B3EA:   F00A       BEQ $B3F6
C0/B3EC:   ADB51E     LDA $1EB5
C0/B3EF:   1FFCBAC0   ORA $C0BAFC,X
C0/B3F3:   8DB51E     STA $1EB5
C0/B3F6:   C221       REP #$21
C0/B3F8:   98         TYA
C0/B3F9:   692900     ADC #$0029
C0/B3FC:   A8         TAY
C0/B3FD:   7B         TDC
C0/B3FE:   E220       SEP #$20      (8 bit accum./memory)
C0/B400:   E8         INX
C0/B401:   E00800     CPX #$0008
C0/B404:   D0DF       BNE $B3E5
C0/B406:   A901       LDA #$01
C0/B408:   4C5C9B     JMP $9B5C


Load CaseWord with the characters in the active party
(gen. act. DE)

C0/B40B:   7B         TDC
C0/B40C:   8DB41E     STA $1EB4      (since A is still 8 bit, two STZ commands would work here)
C0/B40F:   8DB51E     STA $1EB5
C0/B412:   A600       LDX $00
C0/B414:   9B         TXY
C0/B415:   B96708     LDA $0867,Y
C0/B418:   2907       AND #$07
C0/B41A:   CD6D1A     CMP $1A6D      (Is this the active party?)
C0/B41D:   D00A       BNE $B429
C0/B41F:   ADB41E     LDA $1EB4
C0/B422:   1FFCBAC0   ORA $C0BAFC,X
C0/B426:   8DB41E     STA $1EB4
C0/B429:   C221       REP #$21
C0/B42B:   98         TYA
C0/B42C:   692900     ADC #$0029
C0/B42F:   A8         TAY
C0/B430:   7B         TDC
C0/B431:   E220       SEP #$20      (8 bit accum./memory)
C0/B433:   E8         INX
C0/B434:   E00800     CPX #$0008
C0/B437:   D0DC       BNE $B415
C0/B439:   A600       LDX $00
C0/B43B:   9B         TXY
C0/B43C:   B9AF09     LDA $09AF,Y
C0/B43F:   2907       AND #$07
C0/B441:   CD6D1A     CMP $1A6D      (Is this the active party?)
C0/B444:   D00A       BNE $B450
C0/B446:   ADB51E     LDA $1EB5
C0/B449:   1FFCBAC0   ORA $C0BAFC,X
C0/B44D:   8DB51E     STA $1EB5
C0/B450:   C221       REP #$21
C0/B452:   98         TYA
C0/B453:   692900     ADC #$0029
C0/B456:   A8         TAY
C0/B457:   7B         TDC
C0/B458:   E220       SEP #$20      (8 bit accum./memory)
C0/B45A:   E8         INX
C0/B45B:   E00800     CPX #$0008
C0/B45E:   D0DC       BNE $B43C
C0/B460:   A901       LDA #$01
C0/B462:   4C5C9B     JMP $9B5C


(gen. act. DF)

C0/B465:   7B         TDC
C0/B466:   8DB41E     STA $1EB4      (LDX $00, STX $1EB4...)
C0/B469:   8DB51E     STA $1EB5      (clear the caseword)
C0/B46C:   A600       LDX $00
C0/B46E:   9B         TXY
C0/B46F:   B96708     LDA $0867,Y
C0/B472:   2940       AND #$40
C0/B474:   F00A       BEQ $B480
C0/B476:   ADB41E     LDA $1EB4      (load caseword)
C0/B479:   1FFCBAC0   ORA $C0BAFC,X  (set a bit)
C0/B47D:   8DB41E     STA $1EB4      (save caseword)
C0/B480:   C221       REP #$21
C0/B482:   98         TYA
C0/B483:   692900     ADC #$0029
C0/B486:   A8         TAY
C0/B487:   7B         TDC
C0/B488:   E220       SEP #$20      (8 bit accum./memory)
C0/B48A:   E8         INX
C0/B48B:   E00800     CPX #$0008     (have we done 8 characters yet?)
C0/B48E:   D0DF       BNE $B46F      (branch if not)
C0/B490:   A600       LDX $00
C0/B492:   9B         TXY
C0/B493:   B9AF09     LDA $09AF,Y
C0/B496:   2940       AND #$40
C0/B498:   F00A       BEQ $B4A4
C0/B49A:   ADB51E     LDA $1EB5      (load caseword)
C0/B49D:   1FFCBAC0   ORA $C0BAFC,X  (set a bit)
C0/B4A1:   8DB51E     STA $1EB5      (save caseword)
C0/B4A4:   C221       REP #$21
C0/B4A6:   98         TYA
C0/B4A7:   692900     ADC #$0029
C0/B4AA:   A8         TAY
C0/B4AB:   7B         TDC
C0/B4AC:   E220       SEP #$20      (8 bit accum./memory)
C0/B4AE:   E8         INX
C0/B4AF:   E00800     CPX #$0008     (have we done 8 characters yet?)
C0/B4B2:   D0DF       BNE $B493      (branch if not)
C0/B4B4:   A901       LDA #$01
C0/B4B6:   4C5C9B     JMP $9B5C      (advance event queue 1 byte)


It's all as clear as mud. DF is so similar to DE and E3, it's really hard to establish any logical reasoning for this.

Doing some tests, all I can determine is that DF seems to be related to the current party. With an NPC Sabin sitting in a room, the caseword was not affected (my party was just Locke, and the caseword going into the room was already #$0002). Well, inaccurate, since the command did set a value, just happened to be the value it currently was. Yes, I did set a breakpoint on the caseword, and the only time it was ever written to was by command DF.

So, what does all of this mean? *shrug* All I know is, I'm just as confused as I was 20 minutes ago. To top it all off, I ran into an old routine. The infamous equipment check function of C0.

Code: Select all
C0/6CF3:   9CDF11     STZ $11DF      (from C0/A032, C0/B094, C0/BF97)
C0/6CF6:   A400       LDY $00
C0/6CF8:   641B       STZ $1B
C0/6CFA:   B96708     LDA $0867,Y
C0/6CFD:   2940       AND #$40
C0/6CFF:   F013       BEQ $6D14
C0/6D01:   B96708     LDA $0867,Y
C0/6D04:   2907       AND #$07
C0/6D06:   CD6D1A     CMP $1A6D      (Is this the active party?)
C0/6D09:   D009       BNE $6D14
C0/6D0B:   5A         PHY
C0/6D0C:   A51B       LDA $1B        (load current character)
C0/6D0E:   220600C2   JSL $C20006    ("Equipment check function," enforces stat caps, etc)
C0/6D12:   7B         TDC
C0/6D13:   7A         PLY
C0/6D14:   C221       REP #$21
C0/6D16:   98         TYA
C0/6D17:   692900     ADC #$0029     (increment for next character)
C0/6D1A:   A8         TAY
C0/6D1B:   7B         TDC
C0/6D1C:   E220       SEP #$20       (8 bit accum./memory)
C0/6D1E:   E61B       INC $1B
C0/6D20:   C09002     CPY #$0290     (have we checked 16 characters?)
C0/6D23:   D0D5       BNE $6CFA      (branch if not)
C0/6D25:   60         RTS


Ok, more like "why is that there at all?"

This will be figured out, I assure you. I only hope my sanity hasn't left me by the time that happens. :?
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Lenophis
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