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Pinout for "I, Robot" CPU board connector (P20)
	A	GND
	1	GND
	Z	GND
	22	-Sense
	B	+5V
	2	+5V
	Y	+5V out
	21	+Sense
	3
	X	Joystick X
	4	Reset from switching power supply
	W
	E	+10.3V unregulated
	18	+10.3V unregulated
	C
	D
	F	Led player 2
	H	Coin counter right
	J	Joystick Y
	K
	L	Coin right
	M	Test
	N
	P
	R
	S
	T	Fire 1
	U	Start player 2
	V	Reset out
	5
	6	Led player 1
	7	Coin counter left
	8	Audio 1
	9	Audio 2
	10 	Coin left
	11	Aux. coin
	12
	13
	14
	15
	16
	17	Start player 1
	19
	20
	
Pinout for "I, Robot" video board connector (P19)
	A	Ground
	B	+5V
	C
	D
	E
	F
	H	Video ground
	J
	K
	L
	M
	N
	P
	R	+5V
	S	Ground
	1	Ground
	2	+5V
	3	V sync
	4	H sync
	5	Red
	6	Green
	7	Blue
	8	V int (interrupt?)
	9	- Composite sync
	10
	11
	12
	13
	14
	15

Additional information:
	10.3 V / 15.5 V ???
	Looking at the power supply schematic, there is a 15.5V signal
	generated, that goes to pin E on connector P20.  The voltage
	also goes to pin 9 on the 'control panel' connector (P24).  However,
        if you look at the CPU pinout (above), pin E is mentioned as using
        10.3V unregulated.  I from what I see, I suppose that anything
        between 10.3V and 15.5V should work.  I know many switching power
        supplies that you can buy come with +-12V output, maybe you can use
        this.

	Audio 1 / Audio 2
	The CPU PCB has two audio outputs (pins 8 and 9) that connect
	to the switching power supply in the following way:
		    CPU PCB        Switching power supply
		Audio 1 (pin 8) - L audio (pin 1)
		Audio 2 (pin 9) - L audio GND (pin 2)
	The power supply has two additional outputs that connect to
	the speaker/volume control
		   power supply
		L speaker + (pin 3) - 'utility panel' pin 2
		L speaker - (pin 4) - 'utility panel' pin 1
		                      speaker +
	I am not 100% sure where the Audio 1/2 signal is amplified.  All
        I can tell is that the audio output from the CPU goes into the
        power supply, and two other audio lines go from the power supply to
        the volume knob / speakers.


-----------------------------------------------------------------------
    If it really was the truth, why are faces filled
        with anger that should only shine with youth?   - Big Country
-----------------------------------------------------------------------
John P. Manfreda                     Robert Bosch Corporation
Applications/Software Engineer       38000 Hills Tech Drive
(810) 553-1371                       Farmington Hills, MI 48331-3417
           -- jmanfred@fh.us.bosch.com or Frito@msn.com --


 


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