This is a dropin board of batari’s S-video mod schematic for the Atari 2600. (The best Atari video mod in my opinion). The pause mod portion was designed by Victor Trucco.
Notes: The FMS6400 can be substituted with the FMS6410 or ML6428. I already routed 5 volts to ASEL (pin 2) on the FMS64XX so there’s no need to jump it yourself.
The FMS6406 is NOT compatible with board. You will fry the chip if you use the FMS6406
The TIA chip goes on the bottom header row
Jump the RDY Pad if you do not wish to use the Pause Mod. In doing so, you may leave the pause mod unpopulated. C & R pads are still required for audio.
I’ve noticed some eBay sellers, selling some other boards I’ve designed in the past without my permission. I consider this board under the Creative Commons License. If you wish to sell this board, you may (possibly) obtain my permission by contacting me through email.
My email is - [email protected]
This board is quick and dirty. Still can solder to it, it just unprofessional a tad that I didn’t test it, but If you wish to try it anyways, you may. Should work just fine as there’s no continuity errors in eagle.
Also, the board title mentions how there’s “no 75 ohm impedance on i/o” what I meant by that was that there’s no 75Ω impedance and pulldown resistors on the video lines after the FMS amplification. 6 more resistors of 0805 formfactor would actually the board much taller, and I wanted a dropin board that could’ve just worked in the Atari 600 Junior. Probably won’t work in the Jr. anyways, but I wanted it to be as small as possible. If you require the termination and pulldown then simply put some external 75Ω resistors inline with the video outputs, and wire a 75Ω resistor between the soldercups and grounding brackets of your panel mount jacks.
Any good hobbyist will and should have 75 ohm resistors on hand anyhow. So that shouldn’t be an issue.
® Missingno - Creative commons apply. If you wish to sell my board you may, but email me for my permission first.
Part Value Package Library Position (mm) Orientation
AUDIOL Audio Left SMD1,27-2,54 wirepad (14.76375 39.21125) R0
AUDIOR Right Audio SMD1,27-2,54 wirepad (16.98625 39.21125) R0
C Chroma SMD1,27-2,54 wirepad (34.76625 39.21125) R0
C1 0.1uF C0805 rcl (31.511875 30.00375) R90
C2 0.1uF C0805 rcl (33.734375 30.00375) R270
C3 0.1uF C0805 rcl (36.98875 30.7975) R90
C4 0.1uF C0805 rcl (26.82875 34.6075) R270
C5 10uF C0805 rcl (29.05125 34.6075) R270
C6 0.1uF C0805 rcl (18.7325 12.85875) R0
C7 0.1uF C0805 rcl (14.12875 12.85875) R0
C8 0.1uF C0805 rcl (27.305 8.73125) R90
CV Composite SMD1,27-2,54 wirepad (32.54375 39.21125) R0
D1 1N4148W SOD3816X135N diode (41.11625 10.31875) R270
D2 1N4148W SOD3816X135N diode (43.02125 10.31875) R270
D3 1N4148W SOD3816X135N diode (44.92625 10.31875) R270
GND0 GND SMD1,27-2,54 wirepad (37.30625 39.21125) R0
GND10 GND SMD1,27-2,54 wirepad (19.20875 39.21125) R0
HEADERS Drop-in to Socket on Board DIL40 ic-package (25.4 12.7) R0
IC1 74HC4050 SO16 40xx (45.085 31.27375) R0
IC2 FMS6400C SOIC8 FMS64XX (contains all FMS derivatives) (23.1775 34.6075) R0
IC3 74LS00 SO14 74xx-us (35.56 10.795) R0
R1 1.5k M0805 rcl (41.91 24.92375) R270
R2 4.7k M0805 rcl (44.45 24.92375) R270
R3 2.2k M0805 rcl (46.99 24.92375) R270
R4 8.2k M0805 rcl (48.26 37.7825) R90
R5 75 M0805 rcl (17.62125 32.7025) R180
R6 2.2k M0805 rcl (45.72 37.7825) R90
R7 75 M0805 rcl (32.146875 33.655) R0
R8 1k M0805 rcl (36.83 24.92375) R270
R9 470 M0805 rcl (43.18 37.7825) R270
R10 3.3k M0805 rcl (39.37 24.92375) R270
R11 1.8k M0805 rcl (18.7325 10.63625) R0
R12 1.8k M0805 rcl (14.12875 10.63625) R0
R13 1k M0805 rcl (29.68625 8.73125) R270
R14 1.5k M0805 rcl (29.68625 13.0175) R270
R15 1k M0805 rcl (43.97375 13.81125) R0
RDY RDYtoTIA SJ jumper (7.14375 8.334375) R180
SW1 Switch Connection 1 SMD1,27-2,54 wirepad (49.37125 12.065) R90
SW2 Switch Connection 2 SMD1,27-2,54 wirepad (49.37125 9.36625) R90
TIA TIA (Stella) DIL40 ic-package (25.4 8.89) R0
U$1 1k TAYDA-POT Tayda-ThruHole-Pots (Helder) (26.82875 26.67) R0
U$2 1k TAYDA-POT Tayda-ThruHole-Pots (Helder) (18.57375 26.67) R0
Y Luma SMD1,27-2,54 wirepad (30.32125 39.21125) R0