I just opened my 600XL to install Antonia 4MB.
AFAIK there is no other mod on the MB (a capacitor and a resistor are soldered to one pin of the UHF modulator). The Motherboard has a "Rev. A" stamped next to the joystick connectors and says CO 61677 7/1983 Rev X9B on the bottom).
Do I have to attach EXTSEL if
- I want to use an Ultimate Cart with that machine?
- I want to use SIDE2?
or is this only required if I use the old firmware (no Idea which one I have).
I also read something about taking out the delay lines (CO60472) and shorting two pins of the socket. Is this required, optional, required in certain cases only?
Thanks for your help!
While the machine is open, is there anything else of use that can be modified to improve operation? The SIO2SD page mentions adding a resistor and removing capacitors from DATAIN/DATAOUT but doesn't name where they're located on a 600XL.
(I do have a Rev. B UAV here but will try the stock video before deciding on an upgrade.)