Atari Jaguar Overview / Repair / BJL Mod & Quick Look at Skunk Cart

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A long look at an Atari Jaguar which doesn’t work with a Skunk Cart.

Thanks to Mr RetroUnlim for the Skunk Cart!
www.retrounlim.com

Additional Info & Corrections :-

1) The pin that was broken on the cart slot was pin 20A which is the ROM1 signal. Guessing this is perhaps a chip select signal. My guess is larger capacity carts would not work without that pin.

2) Not all of those ICs next to the cart slot buffer cart signals. You can see the schematics here:- https://console5.com/techwiki/images/3/3c/Atari_Jaguar_Schematic_%28Full%29.pdf

3) The audio issue you get on these is not an op amp failure, its the regulator that fails for audio! The IC’s that fix the two power issues are 78l05 (sound), MC34163 (main power).

4) PSU needs to be 9V DC (centre negative) 1.5A.

5) I will show a diagram for the BJL BIOS mod I did in the BJL video later. Basically you lift pin 30 so it doesn’t go into the socket. That is A17 (the upper most address bit on the 256K ROM we’ve fitted. When that pin toggles between high and low, we are swapping between the lower 128K or upper 128K of the ROM (ie. our two different ROMs). I used the jumper to feed either 5v or ground into the A17 pin on the chip. Technically you should probably limit current with a resistor, we can do that in the next part.

 #atari #jaguar #atarijaguar #repair #retrogaming