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+~~~~~~~~~~~~~~~~~~~~~~~~~
+Amiga joystick extensions
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+
+Amiga 4-joystick parport extension
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Parallel port pins:
+
+
+===== ======== ==== ==========
+Pin Meaning Pin Meaning
+===== ======== ==== ==========
+ 2 Up1 6 Up2
+ 3 Down1 7 Down2
+ 4 Left1 8 Left2
+ 5 Right1 9 Right2
+13 Fire1 11 Fire2
+18 Gnd1 18 Gnd2
+===== ======== ==== ==========
+
+Amiga digital joystick pinout
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+=== ============
+Pin Meaning
+=== ============
+1 Up
+2 Down
+3 Left
+4 Right
+5 n/c
+6 Fire button
+7 +5V (50mA)
+8 Gnd
+9 Thumb button
+=== ============
+
+Amiga mouse pinout
+~~~~~~~~~~~~~~~~~~
+
+=== ============
+Pin Meaning
+=== ============
+1 V-pulse
+2 H-pulse
+3 VQ-pulse
+4 HQ-pulse
+5 Middle button
+6 Left button
+7 +5V (50mA)
+8 Gnd
+9 Right button
+=== ============
+
+Amiga analog joystick pinout
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+=== ==============
+Pin Meaning
+=== ==============
+1 Top button
+2 Top2 button
+3 Trigger button
+4 Thumb button
+5 Analog X
+6 n/c
+7 +5V (50mA)
+8 Gnd
+9 Analog Y
+=== ==============
+
+Amiga lightpen pinout
+~~~~~~~~~~~~~~~~~~~~~
+
+=== =============
+Pin Meaning
+=== =============
+1 n/c
+2 n/c
+3 n/c
+4 n/c
+5 Touch button
+6 /Beamtrigger
+7 +5V (50mA)
+8 Gnd
+9 Stylus button
+=== =============
+
+-------------------------------------------------------------------------------
+
+======== === ==== ==== ====== ========================================
+NAME rev ADDR type chip Description
+======== === ==== ==== ====== ========================================
+JOY0DAT 00A R Denise Joystick-mouse 0 data (left vert, horiz)
+JOY1DAT 00C R Denise Joystick-mouse 1 data (right vert,horiz)
+======== === ==== ==== ====== ========================================
+
+ These addresses each read a 16 bit register. These in turn
+ are loaded from the MDAT serial stream and are clocked in on
+ the rising edge of SCLK. MLD output is used to parallel load
+ the external parallel-to-serial converter.This in turn is
+ loaded with the 4 quadrature inputs from each of two game
+ controller ports (8 total) plus 8 miscellaneous control bits
+ which are new for LISA and can be read in upper 8 bits of
+ LISAID.
+
+ Register bits are as follows:
+
+ - Mouse counter usage (pins 1,3 =Yclock, pins 2,4 =Xclock)
+
+======== === === === === === === === === ====== === === === === === === ===
+ BIT# 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
+======== === === === === === === === === ====== === === === === === === ===
+JOY0DAT Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 X7 X6 X5 X4 X3 X2 X1 X0
+JOY1DAT Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 X7 X6 X5 X4 X3 X2 X1 X0
+======== === === === === === === === === ====== === === === === === === ===
+
+ 0=LEFT CONTROLLER PAIR, 1=RIGHT CONTROLLER PAIR.
+ (4 counters total). The bit usage for both left and right
+ addresses is shown below. Each 6 bit counter (Y7-Y2,X7-X2) is
+ clocked by 2 of the signals input from the mouse serial
+ stream. Starting with first bit received:
+
+ +-------------------+-----------------------------------------+
+ | Serial | Bit Name | Description |
+ +========+==========+=========================================+
+ | 0 | M0H | JOY0DAT Horizontal Clock |
+ +--------+----------+-----------------------------------------+
+ | 1 | M0HQ | JOY0DAT Horizontal Clock (quadrature) |
+ +--------+----------+-----------------------------------------+
+ | 2 | M0V | JOY0DAT Vertical Clock |
+ +--------+----------+-----------------------------------------+
+ | 3 | M0VQ | JOY0DAT Vertical Clock (quadrature) |
+ +--------+----------+-----------------------------------------+
+ | 4 | M1V | JOY1DAT Horizontal Clock |
+ +--------+----------+-----------------------------------------+
+ | 5 | M1VQ | JOY1DAT Horizontal Clock (quadrature) |
+ +--------+----------+-----------------------------------------+
+ | 6 | M1V | JOY1DAT Vertical Clock |
+ +--------+----------+-----------------------------------------+
+ | 7 | M1VQ | JOY1DAT Vertical Clock (quadrature) |
+ +--------+----------+-----------------------------------------+
+
+ Bits 1 and 0 of each counter (Y1-Y0,X1-X0) may be
+ read to determine the state of the related input signal pair.
+ This allows these pins to double as joystick switch inputs.
+ Joystick switch closures can be deciphered as follows:
+
+ +------------+------+---------------------------------+
+ | Directions | Pin# | Counter bits |
+ +============+======+=================================+
+ | Forward | 1 | Y1 xor Y0 (BIT#09 xor BIT#08) |
+ +------------+------+---------------------------------+
+ | Left | 3 | Y1 |
+ +------------+------+---------------------------------+
+ | Back | 2 | X1 xor X0 (BIT#01 xor BIT#00) |
+ +------------+------+---------------------------------+
+ | Right | 4 | X1 |
+ +------------+------+---------------------------------+
+
+-------------------------------------------------------------------------------
+
+======== === ==== ==== ====== =================================================
+NAME rev ADDR type chip Description
+======== === ==== ==== ====== =================================================
+JOYTEST 036 W Denise Write to all 4 joystick-mouse counters at once.
+======== === ==== ==== ====== =================================================
+
+ Mouse counter write test data:
+
+========= === === === === === === === === ====== === === === === === === ===
+ BIT# 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
+========= === === === === === === === === ====== === === === === === === ===
+ JOYxDAT Y7 Y6 Y5 Y4 Y3 Y2 xx xx X7 X6 X5 X4 X3 X2 xx xx
+ JOYxDAT Y7 Y6 Y5 Y4 Y3 Y2 xx xx X7 X6 X5 X4 X3 X2 xx xx
+========= === === === === === === === === ====== === === === === === === ===
+
+-------------------------------------------------------------------------------
+
+======= === ==== ==== ====== ========================================
+NAME rev ADDR type chip Description
+======= === ==== ==== ====== ========================================
+POT0DAT h 012 R Paula Pot counter data left pair (vert, horiz)
+POT1DAT h 014 R Paula Pot counter data right pair (vert,horiz)
+======= === ==== ==== ====== ========================================
+
+ These addresses each read a pair of 8 bit pot counters.
+ (4 counters total). The bit assignment for both
+ addresses is shown below. The counters are stopped by signals
+ from 2 controller connectors (left-right) with 2 pins each.
+
+====== === === === === === === === === ====== === === === === === === ===
+ BIT# 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
+====== === === === === === === === === ====== === === === === === === ===
+ RIGHT Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 X7 X6 X5 X4 X3 X2 X1 X0
+ LEFT Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 X7 X6 X5 X4 X3 X2 X1 X0
+====== === === === === === === === === ====== === === === === === === ===
+
+ +--------------------------+-------+
+ | CONNECTORS | PAULA |
+ +-------+------+-----+-----+-------+
+ | Loc. | Dir. | Sym | pin | pin |
+ +=======+======+=====+=====+=======+
+ | RIGHT | Y | RX | 9 | 33 |
+ +-------+------+-----+-----+-------+
+ | RIGHT | X | RX | 5 | 32 |
+ +-------+------+-----+-----+-------+
+ | LEFT | Y | LY | 9 | 36 |
+ +-------+------+-----+-----+-------+
+ | LEFT | X | LX | 5 | 35 |
+ +-------+------+-----+-----+-------+
+
+ With normal (NTSC or PAL) horiz. line rate, the pots will
+ give a full scale (FF) reading with about 500kohms in one
+ frame time. With proportionally faster horiz line times,
+ the counters will count proportionally faster.
+ This should be noted when doing variable beam displays.
+
+-------------------------------------------------------------------------------
+
+====== === ==== ==== ====== ================================================
+NAME rev ADDR type chip Description
+====== === ==== ==== ====== ================================================
+POTGO 034 W Paula Pot port (4 bit) bi-direction and data, and pot
+ counter start.
+====== === ==== ==== ====== ================================================
+
+-------------------------------------------------------------------------------
+
+====== === ==== ==== ====== ================================================
+NAME rev ADDR type chip Description
+====== === ==== ==== ====== ================================================
+POTINP 016 R Paula Pot pin data read
+====== === ==== ==== ====== ================================================
+
+ This register controls a 4 bit bi-direction I/O port
+ that shares the same 4 pins as the 4 pot counters above.
+
+ +-------+----------+---------------------------------------------+
+ | BIT# | FUNCTION | DESCRIPTION |
+ +=======+==========+=============================================+
+ | 15 | OUTRY | Output enable for Paula pin 33 |
+ +-------+----------+---------------------------------------------+
+ | 14 | DATRY | I/O data Paula pin 33 |
+ +-------+----------+---------------------------------------------+
+ | 13 | OUTRX | Output enable for Paula pin 32 |
+ +-------+----------+---------------------------------------------+
+ | 12 | DATRX | I/O data Paula pin 32 |
+ +-------+----------+---------------------------------------------+
+ | 11 | OUTLY | Out put enable for Paula pin 36 |
+ +-------+----------+---------------------------------------------+
+ | 10 | DATLY | I/O data Paula pin 36 |
+ +-------+----------+---------------------------------------------+
+ | 09 | OUTLX | Output enable for Paula pin 35 |
+ +-------+----------+---------------------------------------------+
+ | 08 | DATLX | I/O data Paula pin 35 |
+ +-------+----------+---------------------------------------------+
+ | 07-01 | X | Not used |
+ +-------+----------+---------------------------------------------+
+ | 00 | START | Start pots (dump capacitors,start counters) |
+ +-------+----------+---------------------------------------------+