CT63 only starts from 030 mode

[mikro]

I also measured my CT60 and this is not the case. I'm guessing this is either down to:
i) Too thin traces on the new CT63 or
ii) Some new protection component between 5V in and out, that has too high resistance.

Maybe you can ask Pavel (centuriotech) about this one? Seems like an interesting discovery.

And thanks for sharing, good to know that this fix really makes difference!

[foft]

Maybe you can ask Pavel (centuriotech) about this one? Seems like an interesting discovery.

Forgot to post back here, I discussed this with Pavel at your suggestion and he is looking into it. He told me there is actually a wide trace of >50mil width of copper for 5V. Though the routing changed to allow the ATX power input to be the right way round on the new boards. I calculate that longer route + possibly 0.5 oz/sq ft (common in internal layers) probably explains the resistance. Anyway he is checking it applies to other pcbs, it could just be a defect on mine. Lets see what he finds.

On another note I finally got some PCBs made for the original topic of this discussion. They delay the 5v power on by about 150ms which allows it to power up every time in 060 mode. I posted a prototype veroboard version earlier, but its much easier to solder that tiny chip with a pcb! Small ~1cm^2 board, which connects inline to 5v then needs a wire to GND. I'm going to crimp up a wire to try a pico PSU with it. It works on 3 other PSUs I tested though.

IMG_1920.jpg

[HigashiJun]

Well done.

Hope it will help a lot of CT63 users.

8-)

[nemox]

Isn't 2.5 amperage not enough?
thanks

[foft]

It’s ok for the Falcon alone +/- CT60. If using heavy peripherals then might need higher current.

IMG_1928.png

[mikro]

On another note I finally got some PCBs made for the original topic of this discussion.

Btw do you still have some of those left? Me and one other fellow have a very similar problem with our (newly produced) CT63s: https://www.atari-forum.com/viewtopic.p ... 72#p460972 so it would be interesting to try your solution.