Panther Posted April 6, 2021 Author Share Posted April 6, 2021 I checked for the O2 signal at the cartridge port and it's not there, despite all the schematics showing otherwise. Like the 800 left port, it's tied to RAS, not O2. Quote Link to comment Share on other sites More sharing options...
ClausB Posted April 6, 2021 Share Posted April 6, 2021 Right. RAS had the same frequency as Phi2 but different duty cycle. I'm confused. Was the broken Mainboard the one with the mod? Was the mod the problem all along? Quote Link to comment Share on other sites More sharing options...
Panther Posted April 6, 2021 Author Share Posted April 6, 2021 The problem motherboard was the one with your RAM mod in it that was working fine until I installed a UAV and then connected the CPU and RAM card backards when I tested. My spare board was the one with that RAM mod plate on the bottom that matches the factory upgrade configuration, but I lack a board for. I did find a bad capacitor on the problem mainboard, but the problem was that I was trying to use a stock 16K board to troubleshoot getting it working again. This is what screwed me up. Eventually I redid my 64K RAM board and things started working again. Now I'm hooking up Phi2 to the cartridge port so that my AtariMax carts work properly. Quote Link to comment Share on other sites More sharing options...
ClausB Posted April 6, 2021 Share Posted April 6, 2021 Were some of the RAM chips bad? I posted earlier that 4116 (16K) chips could handle the overvolltage. Now that I know the backwards board was 48K with 4164 chips, I suspect some were damaged. Quote Link to comment Share on other sites More sharing options...
Panther Posted April 6, 2021 Author Share Posted April 6, 2021 26 minutes ago, ClausB said: Were some of the RAM chips bad? I posted earlier that 4116 (16K) chips could handle the overvolltage. Now that I know the backwards board was 48K with 4164 chips, I suspect some were damaged. Probably, the card did not function so I ended up just swapping out all the RAM and the 7400 series chips. It has better quality RAM now anyway. I've swapped in Phi2 instead of the RAS signal to pin S of the cartridge port and while this likely will have improved compatibility with some cartridges, this AtariMax cart still won't run everything on it. The same games run on an 800, but not the 400. Some games on the AtariMax do function, however. I'll test some other multi-carts later. Quote Link to comment Share on other sites More sharing options...
Panther Posted April 13, 2021 Author Share Posted April 13, 2021 So that's what my living room was missing all this time, an Atari! 2 Quote Link to comment Share on other sites More sharing options...
Keatah Posted April 14, 2021 Share Posted April 14, 2021 What a contrast in styling! Quote Link to comment Share on other sites More sharing options...
Panther Posted April 14, 2021 Author Share Posted April 14, 2021 If it stands out so far in time, why not style too? It's definitely noticeable. Quote Link to comment Share on other sites More sharing options...
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