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Thread: Help with Cadash

  1. #1
    Join Date
    Oct 2006
    Location
    Avellaneda
    Posts
    733

    Smile Help with Cadash

    As i said I use to play Genesis in my N-Gage QD. The emulator I use is Picodrive. It has no support for GG or PAR yet. So the only way to enter codes is to hack them in to the rom. Thats why I need a Master Code. In some games fixing the Checksum fix the problem, but now I'm having trouble with this one: Cadash (JU) [c][!] :

    After fixing the checksum it keeps doing the same: a black screen.
    So I tried to do the trace trick in HazeMD:

    Good Trace:

    Code:
      (loops for 262146 instructions)
    
    00034C: lea     $18e.w, A0
    000350: andi.l  #$ffff, D1
    000356: cmp.w   (A0), D1
    000358: bne     $846
    00035C: nop
    00035E: nop
    000360: lea     $ff0200.l, A1
    000366: move.w  #$3, D1
    00036A: clr.l   (A1)+
    00036C: dbra    D1, $36a
    00036A: clr.l   (A1)+
    00036C: dbra    D1, $36a
    Bad Trace:

    Code:
       (loops for 262146 instructions)
    
    00034C: lea     $18e.w, A0
    000350: andi.l  #$ffff, D1
    000356: cmp.w   (A0), D1
    000358: bne     $846
    000846: moveq   #$3f, D7
    000848: move.w  #$e, $c00000.l
    000850: dbra    D7, $848
    000848: move.w  #$e, $c00000.l
    000850: dbra    D7, $848
    So It seems that I must modify the BNE at 358. If I change it to a NOP (4E71) It shows the Sega Logo, but then freezes in a black screen. Same result with RTS (4E75) and a bunch of branchs (60xx) combinations from 6000 to 6012.

    Whats wrong?.

  2. #2
    Join Date
    Oct 2006
    Location
    Avellaneda
    Posts
    733

    Talking I don't know what happened (¿?)

    Well, it seems the master code is
    000358:6002.

    I don't know why it doesn't work before, but I found the following:
    This rom has a bad checksum. It works perfectly. But if you fix it it stop working, no matter if you use the Master Code or not.
    Thats all.
    Whipon.

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