01: It has been tested with an Atari STFM.
02: The chip (IC1) is a 74LS86.
03: All resistors are 250mW 5%. C1 is a 100nF capacitor, the type and voltage rating are not critical, but I suggest a ceramic type.
04: 
05: I used the P9 power connector on the GBS-8200 V4.0 board to "steal" a +5V supply for this circuit. Red is +5V, black is 0V/GND.
06: Connect the Atari STF(M)/STE up as per the table below.
07: On the schematic diagram, the output is called "Comp Sync out" but in the table I refer to the same signal as CSync.
08: 
09: Code: Tout s�lectionner
10:        Atari      signal      wire colour   GBS-8200 V4.0 board
11:     13 pin DIN                                 P11 connector
12:         6 ------green video---green wire------------"G"
13:         7 ------red video-----red wire--------------"R"
14:         9 ------HSync---------to 78LS86 circuit
15:        10 ------blue video----blue wire-------------"B"
16:        12 ------VSync---------to 78LS86 circuit
17:        13 ------Ground--------black wire------------"GND"
18:                 CSync from----grey wire-------------"S"
19:                 78LS86 circuit
20:                 No connection-yellow wire-----------"VS"