;-------------------------------
; #JMPB400
; boot1 jumps to nibble check at
; $B400 instead of $9D84
; e.g. Decimal Discovery
;-------------------------------
_jmpb400
         lda   gIsBoot0   ; if DOS 3.3 boot0 loader
         bne   jmpb400_exit
         lda   gIsBoot1   ; and DOS 3.3 boot1 loader
         bne   jmpb400_exit
         lda   #$01
         sta   gDisplayBytes
         ldx   #$47
         ldy   #$03
         jsr   compare    ; and T00,S01,$47 ==
         !byte $4C,00,$B4
         bcs   jmpb400_exit
         lda   #s_jmpb400
         jsr   PrintByID
         lda   #$01
         ldx   #$48
         ldy   #$02
         jsr   modify     ; then set T00,S01,$48 =
         !byte $84,$9D
jmpb400_exit