Originally posted by Gideon Zhi

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Here's a link to RSR/The SNES Developers' Lobby. The site's basically dead, it hasn't been updated in years, but you should be able to find a few useful tools, documents, and such there.

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Originally posted by bchoo313

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And last, using TLayerPro, I still only get off color tiles. Sometimes I can see images here and there, but they're never the right color. Ideally when it's in the right mode, all the graphics in the game should show up in the tiles, right? I haven't had a chance to dowload Chickenlumps' Tile Molester, but if this editor alone should fix the problem, then I guess this last part's completely irrelevant.

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;MEGAMI TENSEI DTE ROUTINE
;For compilation with X816
;Note that the following three lines are NECESSARY because X816 is a compiler for
;the SUPER NES and NOT the normal NES. The following will basically "fool" x816 into
;compiling NES code instead of SNES code.
;NOTE: Manually insert a JSR $RoutineAddress at $AF24. Do not forget to add $10 to this
;address to compensate for the iNES header!

.org $8000
.mem 8
.index 8

DTE_Routine:
  LDY $0658        ;This was the first command I overwrote with the jump to the routine.
  LDA ($BE),Y      ;This is the second.
  CMP #$30         ;DTE Range compare 1
  BCC End          ;If A is < #$30, skip DTE (Branch if carry clear) 
  CLC              ;Clear the carry flag - we get here because
  CMP #$80         ;DTE Range Compare 2
  BCS End          ;If A is >=#$80, skip DTE (Branch if carry set)
                   ;If we get past the upper and lower bound range compares, we have DTE!
RunCheck:
  STX $07FE        ;Store X temporarily to THE DEPTHS OF UNUSED RAM
  SEC
  SBC #$30
  CLC
  LDX $07FF        ;Load X with a test byte from THE DEPTHS OF UNUSED RAM
  CPX #$9D         ;Compare it with test=true (#$9D in this case)
  BEQ SecondRun    ;If test=true, we're printing the second character
  BNE FirstRun     ;If test=false, we're printing the FIRST character.
  

FirstRun:          ;For outputting the first character...
  LDX #$9D         ;Load X with Test=true
  DEC $0658        ;Decrement load index (which gets transferred into Y)
  ASL A            ;Double A to get DTE Pair Number
  JMP Base_Routine ;Jump to the shared bits of the routine (4C2780)

SecondRun:
  ASL A            ;Double A for DTE Pair Number
  CLC              ;Clear the carry cuz we're gonna add
  ADC #$01         ;Increment the accumulator
                   ;A is now the index location of the second byte in the DTE Pair.
  LDX #$00         ;Load X with Test=FALSE

Base_Routine:
  STX $07FF        ;Store test byte to THE DEPTHS OF UNUSED RAM
  TAX              ;Transer A to X for the DTE table lookup
  LDA $DTETable,X  ;Load A with where ever your DTE table happens to be,X
  LDX $07FE        ;Restore X from before routine

End:
  JMP $AF29        ;Jump back to the routine
  

Create_DTE_Table:
.DSW 80            ;Create an 80 ($50) byte empty DTE table to be later filled in
                   ;This gets put -immediately- after the routine.