vgeorgiev

OK, I got the schematics from here: http://atariage.com/forums/topic/199397-2600-clone-capable-of-av-mod/ I put a LED to pin 12 of the counter 4022. When I press button S1 then LED toggles. So I concluded U1 (4011), U2 (4022) and Q1 working OK. However I have 0 channels found on the TV. Still no image on TV. On Tuesday I will replacve the XTAL with 1MHz one. I do not know why current one is 17MHz...

Hi all, I think that the crystal resonator value is not the propper one. It is 17.734475 I guess it should be something like 3.5MHz for PAL.

Hi guys, I am new here. I found this Atari clone in my parents house. I am not sure this is mine or a friend of mine gave me.... Anyway I tried to run it. The 7805 was missing. I put a new one. Connected it to a LCD TV. The TV found 3 channels, but no picture at all. Only stange grayscale patterns. Picture changes when I press start or change game buttons.... That makes me thining that the CPU is working. Here are some pictures. It seems this PCB is almost the same as Mef's one. I couldn't find any info for any chip on this PCB. How can I connect this PCB to AV input of my TV. I checked some pages where 6592 CPU can provide chroma and luma on 27 and 29th pin. Same for 6591 ? CPU is 6591. Joysticks are directly connected to the CPU. Another chip. I guess this is the ROM. It is parallely conneted to the cardridge slot.