Super Mario Bros. - Spiny Egg Intended Behavior

[ColecoFan1981]

Has anyone here been aware that the Spiny Egg movement in the NES version of Super Mario Brothers is not as intended? The link below will tell.

Link about this:
https://tcrf.net/Talk:Super_Mario_Br...ontal_Movement

What we got:

DifLoop:  lda PRDiffAdjustData,y
          sta $01,x
          iny
          iny
          iny
          iny
          dex
          bpl DifLoop
          ldx ObjectOffset
          jsr PlayerLakituDiff
          ldy Player_X_Speed
          cpy #$08
          bcs SetSpSpd
          tay
          lda PseudoRandomBitReg+1,x
          and #$03
          beq UsePosv
          tya
          eor #$ff
          tay
          iny
UsePosv:  tya
SetSpSpd: jsr SmallBBox
          ldy #$02
          sta Enemy_X_Speed,x
          cmp #$00
          bmi SpinyRte
          dey

What should have been:

SetSpSpd: ldy #$02
          sta Enemy_X_Speed,x
          cmp #$00
          bmi SpinyRte
          dey
SpinyRte: jsr SmallBBox

Move the jsr instruction to below the dey instruction, and the movement will be as intended.

This same fix can also be applied to these other SMB variations:
Super Mario Bros. (FDS)
Super Mario Bros. 2 (Japan) (FDS)
All-Night Nippon Super Mario Bros. (FDS)
Vs. Super Mario Bros.
(Please note the offsets for the SetSpSpd instruction will be different for these versions than the NES cartridge version, which is at offset 0x4444 when using a hex editing program like Hexecute or Hex Workshop.)

~Ben