It has been tested with an Atari STFM.
The chip (IC1) is a 74LS86.
All resistors are 250mW 5%. C1 is a 100nF capacitor, the type and voltage rating are not critical, but I suggest a ceramic type.
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.
Connect the Atari STF(M)/STE up as per the table below.
On the schematic diagram, the output is called "Comp Sync out" but in the table I refer to the same signal as CSync.
Code: Tout s�lectionner
Atari signal wire colour GBS-8200 V4.0 board
13 pin DIN P11 connector
6 ------green video---green wire------------"G"
7 ------red video-----red wire--------------"R"
9 ------HSync---------to 78LS86 circuit
10 ------blue video----blue wire-------------"B"
12 ------VSync---------to 78LS86 circuit
13 ------Ground--------black wire------------"GND"
CSync from----grey wire-------------"S"
78LS86 circuit
No connection-yellow wire-----------"VS"