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System Fairchild cartridge pinout

Cartridge pinout.png
1 GND 12 ROMC4
2 GND 13 PHI
3 D0 14 D4
4 D1 15 WRITE
5 /INTREQ 16 D5
6 ROMC0 17 D6
7 ROMC1 18 D7
8 ROMC2 19 +5V
9 D2 20 +5V
10 ROMC3 21 Not Connected
11 D3 22 +12V

Dx signals are eight bits of data.
PHI is the clock signal.
/INTREQ is (hardly ever) used for interrupt.
WRITE is the signal for writing data.
ROMCx are control signals that all 38xx chips use to control what to put on the bus etc.
You can read more about the 32 ROMC-states here on page 20: F3850 the CPU (.pdf, 1.49MB) or the ROMC table.
Usually the cartridges have two 3851 PSU:s, later carts may have RAM and/or up to three PSU:s
and the last released carts seem to use a 3853 SMI chip in combination with a plain ROM chip,
there are other possibilities though.

Controller connector pinout

On the Fairchild VES/Channel F, Luxor VES, SABA etc with a fixed controller the pinout of a hand controller is this: (in the order of the internal 18 pole connector)

1:  black: push down
3:  brown: pull up 
5:  red: clockwise 
7:  orange: counter-clockwise
9:  yellow: forward
11: green: backwards
13: blue: left
15: grey: right
18: white: ground

Skipped numbers are empty in the connector, 16 is plugged. 
Colors vs function are very helpful when resoldering wire in the hand controller.
Channel F II, Grandstand, Nordmende, Luxor  9 pin D-SUB female connector
(called DE9F). Pinout watching the holes on the controller connector:

             5 4 3 2 1
              9 8 7 6 

1: counter-clockwise
2: clockwise
3: pull up
4: push down
5: right
6: forward
7: back
8: left
9: ground

Power pinout

Luxor Video Entertainment System 

9 VAC between pin 1 and 2 on the 4 pin DIN connector
15 VAC between pin 3 and 4 on the DIN connector
Transformer uses a 80mA slow blow (T) fuse.

Special Chips

Pinout for the FCM9102 audio/buffer chip (Rolo, AtariAge)

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