mouse change sensitivity

; X is the controller number

lda mousebyte2,x ; check speed in the second byte read from the mouse
and #%00110000
lsr
lsr
lsr
lsr
cmp #2 ; 2 is fast
bne :+ ; change to the next speed
  lda #1    ; turn on latch
  sta $4016
  lda $4016,x  ; read from controller with latch on
  lda #0
  sta $4016 ; turn off latch
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