Pachinko controller.

The Pachinko controller is a standard joypad controller coupled with a dial.  The dial controls the speed at which the balls are sent.

This controler is used in the following games :

• Pachio-Kun Jūban Shōbu - >パチ夫くん十番勝負
• Pachio-Kun Maboroshi No Densetsu - パチ夫くん幻の伝説
• Pachio-Kun Warau Uchū - パチ夫くん笑う宇宙
• Pachio-Kun 3 Pachisuro & Pachinko - パチ夫くん3パチスロ＆パチ

Basically the controller acts as 2 joypads plugged on a 2 ports multitap.  The first and second read of the joyport will return the directions and the buttons.  While the third and fourth will give the dial value.

This means that a call to joypad_read will do the trick.  joypad+0 will contain the joypad directions and buttons and joypad+1 the dial.

Note the dial value can range from $84 to $fb.  However this value is usually clamped ($9c and $ef for Pachio-Kun Jūban Shōbu (パチ夫くん十番勝負)).

    jsr  joypad_read

    ; Clamp dial values.
    lda  joypad+1

    cmp  #$9c
    bcc  @clamp.lo

    cmp  #$ef
    bcs  @clamp.hi

    bra  @store

@clamp.lo:
    lda  #$9c
    bra  @store

@clamp.hi:
    lda  #$ef

@store:
    sta  dial

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