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Anyone ever seen this with the scrolling landscape? Any ideas on what could be the problem?
You didn't just get this off EBay did you?
Gee, how can you tell?
I got it like a month ago and it was "untested", for like $30 shipped.
I'd start by checking the 2716 ROMs at 5H and 5F. Pull and verify them, and then check for stuck/shorted/open address and data bits. Then maybe the 2114 RAM at 3M and 3L.
I'd start by checking the 2716 ROMs at 5H and 5F. Pull and verify them, and then check for stuck/shorted/open address and data bits. Then maybe the 2114 RAM at 3M and 3L.
Just curious if you made any progress on this. Have you logic probed the ICs feeding into and out of the graphics ROMs and RAM? e.g. buffers and muxes
Could be a bunch of things. Are the sprites flickering? If both the sprites and the background flicker / behave erratic, I'd check the 7- and 8J (adders), which are used to determine sprite intersect and scrolling.
If sprites are okay and it's just the background, I'd suspect either the RAM's at 3M / 3L or anything that surrounded them ( latch, mux, etc ). That section is located pretty much in the center of the schematic.
Hard to go on just a picture but it's something to go on I suppose
-Y